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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
|---|---|---|
| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/qstring.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
Diffstat (limited to 'doc/html/qstring.html')
| -rw-r--r-- | doc/html/qstring.html | 2440 |
1 files changed, 2440 insertions, 0 deletions
diff --git a/doc/html/qstring.html b/doc/html/qstring.html new file mode 100644 index 0000000..26fa781 --- /dev/null +++ b/doc/html/qstring.html @@ -0,0 +1,2440 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/tools/qstring.cpp:1228 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>QString Class</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QString Class Reference</h1> + +<p>The QString class provides an abstraction of Unicode text +and the classic C '\0'-terminated char array. +<a href="#details">More...</a> +<p>All the functions in this class are <a href="threads.html#reentrant">reentrant</a> when Qt is built with thread support.</p> +<p><tt>#include <<a href="qstring-h.html">qstring.h</a>></tt> +<p><a href="qstring-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#QString"><b>QString</b></a> ()</li> +<li class=fn><a href="#QString-2"><b>QString</b></a> ( QChar ch )</li> +<li class=fn><a href="#QString-3"><b>QString</b></a> ( const QString & s )</li> +<li class=fn><a href="#QString-4"><b>QString</b></a> ( const QByteArray & ba )</li> +<li class=fn><a href="#QString-5"><b>QString</b></a> ( const QChar * unicode, uint length )</li> +<li class=fn><a href="#QString-6"><b>QString</b></a> ( const char * str )</li> +<li class=fn><a href="#QString-7"><b>QString</b></a> ( const std::string & str )</li> +<li class=fn><a href="#~QString"><b>~QString</b></a> ()</li> +<li class=fn>QString & <a href="#operator-eq-2"><b>operator=</b></a> ( const QString & s )</li> +<li class=fn>QString & <a href="#operator-eq-3"><b>operator=</b></a> ( const char * str )</li> +<li class=fn>QString & <a href="#operator-eq-4"><b>operator=</b></a> ( const std::string & s )</li> +<li class=fn>QString & <a href="#operator-eq-5"><b>operator=</b></a> ( const QCString & cstr )</li> +<li class=fn>QString & <a href="#operator-eq"><b>operator=</b></a> ( QChar c )</li> +<li class=fn>QString & <a href="#operator-eq-6"><b>operator=</b></a> ( char c )</li> +<li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li> +<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li> +<li class=fn>uint <a href="#length"><b>length</b></a> () const</li> +<li class=fn>void <a href="#truncate"><b>truncate</b></a> ( uint newLen )</li> +<li class=fn>QString & <a href="#fill"><b>fill</b></a> ( QChar c, int len = -1 )</li> +<li class=fn>QString copy () const <em>(obsolete)</em></li> +<li class=fn>QString <a href="#arg-2"><b>arg</b></a> ( long a, int fieldWidth = 0, int base = 10 ) const</li> +<li class=fn>QString <a href="#arg-3"><b>arg</b></a> ( ulong a, int fieldWidth = 0, int base = 10 ) const</li> +<li class=fn>QString <a href="#arg-4"><b>arg</b></a> ( Q_LLONG a, int fieldWidth = 0, int base = 10 ) const</li> +<li class=fn>QString <a href="#arg-5"><b>arg</b></a> ( Q_ULLONG a, int fieldWidth = 0, int base = 10 ) const</li> +<li class=fn>QString <a href="#arg-6"><b>arg</b></a> ( int a, int fieldWidth = 0, int base = 10 ) const</li> +<li class=fn>QString <a href="#arg-7"><b>arg</b></a> ( uint a, int fieldWidth = 0, int base = 10 ) const</li> +<li class=fn>QString <a href="#arg-8"><b>arg</b></a> ( short a, int fieldWidth = 0, int base = 10 ) const</li> +<li class=fn>QString <a href="#arg-9"><b>arg</b></a> ( ushort a, int fieldWidth = 0, int base = 10 ) const</li> +<li class=fn>QString <a href="#arg-a"><b>arg</b></a> ( double a, int fieldWidth = 0, char fmt = 'g', int prec = -1 ) const</li> +<li class=fn>QString <a href="#arg-b"><b>arg</b></a> ( char a, int fieldWidth = 0 ) const</li> +<li class=fn>QString <a href="#arg-c"><b>arg</b></a> ( QChar a, int fieldWidth = 0 ) const</li> +<li class=fn>QString <a href="#arg"><b>arg</b></a> ( const QString & a, int fieldWidth = 0 ) const</li> +<li class=fn>QString <a href="#arg-d"><b>arg</b></a> ( const QString & a1, const QString & a2 ) const</li> +<li class=fn>QString <a href="#arg-e"><b>arg</b></a> ( const QString & a1, const QString & a2, const QString & a3 ) const</li> +<li class=fn>QString <a href="#arg-f"><b>arg</b></a> ( const QString & a1, const QString & a2, const QString & a3, const QString & a4 ) const</li> +<li class=fn>QString & <a href="#sprintf"><b>sprintf</b></a> ( const char * cformat, ... )</li> +<li class=fn>int <a href="#find-2"><b>find</b></a> ( QChar c, int index = 0, bool cs = TRUE ) const</li> +<li class=fn>int <a href="#find-3"><b>find</b></a> ( char c, int index = 0, bool cs = TRUE ) const</li> +<li class=fn>int <a href="#find-4"><b>find</b></a> ( const QString & str, int index = 0, bool cs = TRUE ) const</li> +<li class=fn>int <a href="#find"><b>find</b></a> ( const QRegExp & rx, int index = 0 ) const</li> +<li class=fn>int <a href="#find-5"><b>find</b></a> ( const char * str, int index = 0 ) const</li> +<li class=fn>int <a href="#findRev-2"><b>findRev</b></a> ( QChar c, int index = -1, bool cs = TRUE ) const</li> +<li class=fn>int <a href="#findRev-3"><b>findRev</b></a> ( char c, int index = -1, bool cs = TRUE ) const</li> +<li class=fn>int <a href="#findRev-4"><b>findRev</b></a> ( const QString & str, int index = -1, bool cs = TRUE ) const</li> +<li class=fn>int <a href="#findRev-5"><b>findRev</b></a> ( const QRegExp & rx, int index = -1 ) const</li> +<li class=fn>int <a href="#findRev"><b>findRev</b></a> ( const char * str, int index = -1 ) const</li> +<li class=fn>int <a href="#contains"><b>contains</b></a> ( QChar c, bool cs = TRUE ) const</li> +<li class=fn>int <a href="#contains-2"><b>contains</b></a> ( char c, bool cs = TRUE ) const</li> +<li class=fn>int <a href="#contains-3"><b>contains</b></a> ( const char * str, bool cs = TRUE ) const</li> +<li class=fn>int <a href="#contains-4"><b>contains</b></a> ( const QString & str, bool cs = TRUE ) const</li> +<li class=fn>int <a href="#contains-5"><b>contains</b></a> ( const QRegExp & rx ) const</li> +<li class=fn>enum <a href="#SectionFlags-enum"><b>SectionFlags</b></a> { SectionDefault = 0x00, SectionSkipEmpty = 0x01, SectionIncludeLeadingSep = 0x02, SectionIncludeTrailingSep = 0x04, SectionCaseInsensitiveSeps = 0x08 }</li> +<li class=fn>QString <a href="#section"><b>section</b></a> ( QChar sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const</li> +<li class=fn>QString <a href="#section-2"><b>section</b></a> ( char sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const</li> +<li class=fn>QString <a href="#section-3"><b>section</b></a> ( const char * sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const</li> +<li class=fn>QString <a href="#section-4"><b>section</b></a> ( const QString & sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const</li> +<li class=fn>QString <a href="#section-5"><b>section</b></a> ( const QRegExp & reg, int start, int end = 0xffffffff, int flags = SectionDefault ) const</li> +<li class=fn>QString <a href="#left"><b>left</b></a> ( uint len ) const</li> +<li class=fn>QString <a href="#right"><b>right</b></a> ( uint len ) const</li> +<li class=fn>QString <a href="#mid"><b>mid</b></a> ( uint index, uint len = 0xffffffff ) const</li> +<li class=fn>QString <a href="#leftJustify"><b>leftJustify</b></a> ( uint width, QChar fill = ' ', bool truncate = FALSE ) const</li> +<li class=fn>QString <a href="#rightJustify"><b>rightJustify</b></a> ( uint width, QChar fill = ' ', bool truncate = FALSE ) const</li> +<li class=fn>QString <a href="#lower"><b>lower</b></a> () const</li> +<li class=fn>QString <a href="#upper"><b>upper</b></a> () const</li> +<li class=fn>QString <a href="#stripWhiteSpace"><b>stripWhiteSpace</b></a> () const</li> +<li class=fn>QString <a href="#simplifyWhiteSpace"><b>simplifyWhiteSpace</b></a> () const</li> +<li class=fn>QString & <a href="#insert"><b>insert</b></a> ( uint index, const QString & s )</li> +<li class=fn>QString & <a href="#insert-2"><b>insert</b></a> ( uint index, const QByteArray & s )</li> +<li class=fn>QString & <a href="#insert-3"><b>insert</b></a> ( uint index, const char * s )</li> +<li class=fn>QString & <a href="#insert-4"><b>insert</b></a> ( uint index, const QChar * s, uint len )</li> +<li class=fn>QString & <a href="#insert-5"><b>insert</b></a> ( uint index, QChar c )</li> +<li class=fn>QString & <a href="#insert-6"><b>insert</b></a> ( uint index, char c )</li> +<li class=fn>QString & <a href="#append-2"><b>append</b></a> ( char ch )</li> +<li class=fn>QString & <a href="#append-3"><b>append</b></a> ( QChar ch )</li> +<li class=fn>QString & <a href="#append"><b>append</b></a> ( const QString & str )</li> +<li class=fn>QString & <a href="#append-4"><b>append</b></a> ( const QByteArray & str )</li> +<li class=fn>QString & <a href="#append-5"><b>append</b></a> ( const char * str )</li> +<li class=fn>QString & <a href="#append-6"><b>append</b></a> ( const std::string & str )</li> +<li class=fn>QString & <a href="#prepend-2"><b>prepend</b></a> ( char ch )</li> +<li class=fn>QString & <a href="#prepend-3"><b>prepend</b></a> ( QChar ch )</li> +<li class=fn>QString & <a href="#prepend"><b>prepend</b></a> ( const QString & s )</li> +<li class=fn>QString & <a href="#prepend-4"><b>prepend</b></a> ( const QByteArray & s )</li> +<li class=fn>QString & <a href="#prepend-5"><b>prepend</b></a> ( const char * s )</li> +<li class=fn>QString & <a href="#prepend-6"><b>prepend</b></a> ( const std::string & s )</li> +<li class=fn>QString & <a href="#remove"><b>remove</b></a> ( uint index, uint len )</li> +<li class=fn>QString & <a href="#remove-2"><b>remove</b></a> ( const QString & str, bool cs = TRUE )</li> +<li class=fn>QString & <a href="#remove-3"><b>remove</b></a> ( QChar c )</li> +<li class=fn>QString & <a href="#remove-4"><b>remove</b></a> ( char c )</li> +<li class=fn>QString & <a href="#remove-5"><b>remove</b></a> ( const char * str )</li> +<li class=fn>QString & <a href="#remove-6"><b>remove</b></a> ( const QRegExp & rx )</li> +<li class=fn>QString & <a href="#replace"><b>replace</b></a> ( uint index, uint len, const QString & s )</li> +<li class=fn>QString & <a href="#replace-2"><b>replace</b></a> ( uint index, uint len, const QChar * s, uint slen )</li> +<li class=fn>QString & <a href="#replace-3"><b>replace</b></a> ( uint index, uint len, QChar c )</li> +<li class=fn>QString & <a href="#replace-4"><b>replace</b></a> ( uint index, uint len, char c )</li> +<li class=fn>QString & <a href="#replace-5"><b>replace</b></a> ( QChar c, const QString & after, bool cs = TRUE )</li> +<li class=fn>QString & <a href="#replace-6"><b>replace</b></a> ( char c, const QString & after, bool cs = TRUE )</li> +<li class=fn>QString & <a href="#replace-7"><b>replace</b></a> ( const QString & before, const QString & after, bool cs = TRUE )</li> +<li class=fn>QString & <a href="#replace-8"><b>replace</b></a> ( const QRegExp & rx, const QString & after )</li> +<li class=fn>QString & <a href="#replace-9"><b>replace</b></a> ( QChar c1, QChar c2 )</li> +<li class=fn>short <a href="#toShort"><b>toShort</b></a> ( bool * ok = 0, int base = 10 ) const</li> +<li class=fn>ushort <a href="#toUShort"><b>toUShort</b></a> ( bool * ok = 0, int base = 10 ) const</li> +<li class=fn>int <a href="#toInt"><b>toInt</b></a> ( bool * ok = 0, int base = 10 ) const</li> +<li class=fn>uint <a href="#toUInt"><b>toUInt</b></a> ( bool * ok = 0, int base = 10 ) const</li> +<li class=fn>long <a href="#toLong"><b>toLong</b></a> ( bool * ok = 0, int base = 10 ) const</li> +<li class=fn>ulong <a href="#toULong"><b>toULong</b></a> ( bool * ok = 0, int base = 10 ) const</li> +<li class=fn>Q_LLONG <a href="#toLongLong"><b>toLongLong</b></a> ( bool * ok = 0, int base = 10 ) const</li> +<li class=fn>Q_ULLONG <a href="#toULongLong"><b>toULongLong</b></a> ( bool * ok = 0, int base = 10 ) const</li> +<li class=fn>float <a href="#toFloat"><b>toFloat</b></a> ( bool * ok = 0 ) const</li> +<li class=fn>double <a href="#toDouble"><b>toDouble</b></a> ( bool * ok = 0 ) const</li> +<li class=fn>QString & <a href="#setNum-2"><b>setNum</b></a> ( short n, int base = 10 )</li> +<li class=fn>QString & <a href="#setNum-3"><b>setNum</b></a> ( ushort n, int base = 10 )</li> +<li class=fn>QString & <a href="#setNum-4"><b>setNum</b></a> ( int n, int base = 10 )</li> +<li class=fn>QString & <a href="#setNum-5"><b>setNum</b></a> ( uint n, int base = 10 )</li> +<li class=fn>QString & <a href="#setNum-6"><b>setNum</b></a> ( long n, int base = 10 )</li> +<li class=fn>QString & <a href="#setNum-7"><b>setNum</b></a> ( ulong n, int base = 10 )</li> +<li class=fn>QString & <a href="#setNum"><b>setNum</b></a> ( Q_LLONG n, int base = 10 )</li> +<li class=fn>QString & <a href="#setNum-8"><b>setNum</b></a> ( Q_ULLONG n, int base = 10 )</li> +<li class=fn>QString & <a href="#setNum-9"><b>setNum</b></a> ( float n, char f = 'g', int prec = 6 )</li> +<li class=fn>QString & <a href="#setNum-a"><b>setNum</b></a> ( double n, char f = 'g', int prec = 6 )</li> +<li class=fn>void setExpand ( uint index, QChar c ) <em>(obsolete)</em></li> +<li class=fn>QString & <a href="#operator+-eq"><b>operator+=</b></a> ( const QString & str )</li> +<li class=fn>QString & <a href="#operator+-eq-2"><b>operator+=</b></a> ( const QByteArray & str )</li> +<li class=fn>QString & <a href="#operator+-eq-3"><b>operator+=</b></a> ( const char * str )</li> +<li class=fn>QString & <a href="#operator+-eq-4"><b>operator+=</b></a> ( const std::string & str )</li> +<li class=fn>QString & <a href="#operator+-eq-5"><b>operator+=</b></a> ( QChar c )</li> +<li class=fn>QString & <a href="#operator+-eq-6"><b>operator+=</b></a> ( char c )</li> +<li class=fn>QChar <a href="#at"><b>at</b></a> ( uint i ) const</li> +<li class=fn>QChar <a href="#operator[]"><b>operator[]</b></a> ( int i ) const</li> +<li class=fn>QCharRef <a href="#at-2"><b>at</b></a> ( uint i )</li> +<li class=fn>QCharRef <a href="#operator[]-2"><b>operator[]</b></a> ( int i )</li> +<li class=fn>QChar <a href="#constref"><b>constref</b></a> ( uint i ) const</li> +<li class=fn>QChar & <a href="#ref"><b>ref</b></a> ( uint i )</li> +<li class=fn>const QChar * <a href="#unicode"><b>unicode</b></a> () const</li> +<li class=fn>const char * <a href="#ascii"><b>ascii</b></a> () const</li> +<li class=fn>const char * <a href="#latin1"><b>latin1</b></a> () const</li> +<li class=fn>QCString <a href="#utf8"><b>utf8</b></a> () const</li> +<li class=fn>QCString <a href="#local8Bit"><b>local8Bit</b></a> () const</li> +<li class=fn>bool <a href="#operator!"><b>operator!</b></a> () const</li> +<li class=fn><a href="#operator-const-char-*"><b>operator const char *</b></a> () const</li> +<li class=fn><a href="#operator-std::string"><b>operator std::string</b></a> () const</li> +<li class=fn>const unsigned short * <a href="#ucs2"><b>ucs2</b></a> () const</li> +<li class=fn>QString & <a href="#setUnicode"><b>setUnicode</b></a> ( const QChar * unicode, uint len )</li> +<li class=fn>QString & <a href="#setUnicodeCodes"><b>setUnicodeCodes</b></a> ( const ushort * unicode_as_ushorts, uint len )</li> +<li class=fn>QString & <a href="#setAscii"><b>setAscii</b></a> ( const char * str, int len = -1 )</li> +<li class=fn>QString & <a href="#setLatin1"><b>setLatin1</b></a> ( const char * str, int len = -1 )</li> +<li class=fn>int <a href="#compare-2"><b>compare</b></a> ( const QString & s ) const</li> +<li class=fn>int <a href="#localeAwareCompare-2"><b>localeAwareCompare</b></a> ( const QString & s ) const</li> +<li class=fn>void <a href="#compose"><b>compose</b></a> ()</li> +<li class=fn>const char * data () const <em>(obsolete)</em></li> +<li class=fn>bool <a href="#startsWith"><b>startsWith</b></a> ( const QString & s, bool cs = TRUE ) const</li> +<li class=fn>bool <a href="#endsWith"><b>endsWith</b></a> ( const QString & s, bool cs = TRUE ) const</li> +<li class=fn>void <a href="#setLength"><b>setLength</b></a> ( uint newLen )</li> +<li class=fn>uint <a href="#capacity"><b>capacity</b></a> () const</li> +<li class=fn>void <a href="#reserve"><b>reserve</b></a> ( uint minCapacity )</li> +<li class=fn>void <a href="#squeeze"><b>squeeze</b></a> ()</li> +</ul> +<h2>Static Public Members</h2> +<ul> +<li class=fn>QString <a href="#number"><b>number</b></a> ( long n, int base = 10 )</li> +<li class=fn>QString <a href="#number-2"><b>number</b></a> ( ulong n, int base = 10 )</li> +<li class=fn>QString <a href="#number-3"><b>number</b></a> ( Q_LLONG n, int base = 10 )</li> +<li class=fn>QString <a href="#number-4"><b>number</b></a> ( Q_ULLONG n, int base = 10 )</li> +<li class=fn>QString <a href="#number-5"><b>number</b></a> ( int n, int base = 10 )</li> +<li class=fn>QString <a href="#number-6"><b>number</b></a> ( uint n, int base = 10 )</li> +<li class=fn>QString <a href="#number-7"><b>number</b></a> ( double n, char f = 'g', int prec = 6 )</li> +<li class=fn>QString <a href="#fromAscii"><b>fromAscii</b></a> ( const char * ascii, int len = -1 )</li> +<li class=fn>QString <a href="#fromLatin1"><b>fromLatin1</b></a> ( const char * chars, int len = -1 )</li> +<li class=fn>QString <a href="#fromUtf8"><b>fromUtf8</b></a> ( const char * utf8, int len = -1 )</li> +<li class=fn>QString <a href="#fromLocal8Bit"><b>fromLocal8Bit</b></a> ( const char * local8Bit, int len = -1 )</li> +<li class=fn>QString <a href="#fromUcs2"><b>fromUcs2</b></a> ( const unsigned short * str )</li> +<li class=fn>int <a href="#compare"><b>compare</b></a> ( const QString & s1, const QString & s2 )</li> +<li class=fn>int <a href="#localeAwareCompare"><b>localeAwareCompare</b></a> ( const QString & s1, const QString & s2 )</li> +</ul> +<h2>Related Functions</h2> +<ul> +<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const QString & s1, const QString & s2 )</li> +<li class=fn>bool <a href="#operator-eq-eq-2"><b>operator==</b></a> ( const QString & s1, const char * s2 )</li> +<li class=fn>bool <a href="#operator-eq-eq-3"><b>operator==</b></a> ( const char * s1, const QString & s2 )</li> +<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const QString & s1, const QString & s2 )</li> +<li class=fn>bool <a href="#operator!-eq-2"><b>operator!=</b></a> ( const QString & s1, const char * s2 )</li> +<li class=fn>bool <a href="#operator!-eq-3"><b>operator!=</b></a> ( const char * s1, const QString & s2 )</li> +<li class=fn>bool <a href="#operator-lt"><b>operator<</b></a> ( const QString & s1, const char * s2 )</li> +<li class=fn>bool <a href="#operator-lt-2"><b>operator<</b></a> ( const char * s1, const QString & s2 )</li> +<li class=fn>bool <a href="#operator-lt-eq"><b>operator<=</b></a> ( const QString & s1, const char * s2 )</li> +<li class=fn>bool <a href="#operator-lt-eq-2"><b>operator<=</b></a> ( const char * s1, const QString & s2 )</li> +<li class=fn>bool <a href="#operator-gt"><b>operator></b></a> ( const QString & s1, const char * s2 )</li> +<li class=fn>bool <a href="#operator-gt-2"><b>operator></b></a> ( const char * s1, const QString & s2 )</li> +<li class=fn>bool <a href="#operator-gt-eq"><b>operator>=</b></a> ( const QString & s1, const char * s2 )</li> +<li class=fn>bool <a href="#operator-gt-eq-2"><b>operator>=</b></a> ( const char * s1, const QString & s2 )</li> +<li class=fn>const QString <a href="#operator+"><b>operator+</b></a> ( const QString & s1, const QString & s2 )</li> +<li class=fn>const QString <a href="#operator+-2"><b>operator+</b></a> ( const QString & s1, const char * s2 )</li> +<li class=fn>const QString <a href="#operator+-3"><b>operator+</b></a> ( const char * s1, const QString & s2 )</li> +<li class=fn>const QString <a href="#operator+-4"><b>operator+</b></a> ( const QString & s, char c )</li> +<li class=fn>const QString <a href="#operator+-5"><b>operator+</b></a> ( char c, const QString & s )</li> +<li class=fn>QDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( QDataStream & s, const QString & str )</li> +<li class=fn>QDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( QDataStream & s, QString & str )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + + +<p> The QString class provides an abstraction of Unicode text +and the classic C '\0'-terminated char array. +<p> + + + +<p> QString uses <a href="shclass.html">implicit sharing</a>, which +makes it very efficient and easy to use. +<p> In all of the QString methods that take <tt>const char *</tt> +parameters, the <tt>const char *</tt> is interpreted as a classic +C-style '\0'-terminated ASCII string. It is legal for the <tt>const char *</tt> parameter to be 0. If the <tt>const char *</tt> is not +'\0'-terminated, the results are undefined. Functions that copy +classic C strings into a QString will not copy the terminating +'\0' character. The <a href="qchar.html">QChar</a> array of the QString (as returned by +<a href="#unicode">unicode</a>()) is generally not terminated by a '\0'. If you need to +pass a QString to a function that requires a C '\0'-terminated +string use <a href="#latin1">latin1</a>(). +<p> <!-- index QString::null --><a name="QString-null"></a>A QString that has not been assigned to anything is <em>null</em>, i.e. +both the length and data pointer is 0. A QString that references +the empty string ("", a single '\0' char) is <em>empty</em>. Both null +and empty QStrings are legal parameters to the methods. Assigning +<tt>(const char *) 0</tt> to QString gives a null QString. For +convenience, <a href="qstring.html#QString-null">QString::null</a> is a null QString. When sorting, +empty strings come first, followed by non-empty strings, followed +by null strings. We recommend using <tt>if ( !str.isNull() )</tt> to +check for a non-null string rather than <tt>if ( !str )</tt>; see <a href="#operator!">operator!</a>() for an explanation. +<p> Note that if you find that you are mixing usage of <a href="qcstring.html">QCString</a>, +QString, and <a href="qbytearray.html">QByteArray</a>, this causes lots of unnecessary +copying and might indicate that the true nature of the data you +are dealing with is uncertain. If the data is '\0'-terminated 8-bit +data, use <a href="qcstring.html">QCString</a>; if it is unterminated (i.e. contains '\0's) +8-bit data, use <a href="qbytearray.html">QByteArray</a>; if it is text, use QString. +<p> Lists of strings are handled by the <a href="qstringlist.html">QStringList</a> class. You can +split a string into a list of strings using <a href="qstringlist.html#split">QStringList::split</a>(), +and join a list of strings into a single string with an optional +separator using <a href="qstringlist.html#join">QStringList::join</a>(). You can obtain a list of +strings from a string list that contain a particular substring or +that match a particular <a href="qregexp.html">regex</a> using +<a href="qstringlist.html#grep">QStringList::grep</a>(). +<p> <b>Note for C programmers</b> +<p> Due to C++'s type system and the fact that QString is <a href="shclass.html#implicitly-shared">implicitly shared</a>, QStrings can be treated like ints or other simple base +types. For example: +<p> <pre> + QString boolToString( bool b ) + { + QString result; + if ( b ) + result = "True"; + else + result = "False"; + return result; + } + </pre> + +<p> The variable, result, is an auto variable allocated on the stack. +When return is called, because we're returning by value, The copy +constructor is called and a copy of the string is returned. (No +actual copying takes place thanks to the <a href="shclass.html#implicit-sharing">implicit sharing</a>, see +below.) +<p> Throughout Qt's source code you will encounter QString usages like +this: +<pre> + QString func( const QString& input ) + { + QString output = input; + // process output + return output; + } + </pre> + +<p> The 'copying' of input to output is almost as fast as copying a +pointer because behind the scenes copying is achieved by +incrementing a reference count. QString (like all Qt's implicitly +shared classes) operates on a copy-on-write basis, only copying if +an instance is actually changed. +<p> If you wish to create a <a href="shclass.html#deep-copy">deep copy</a> of a QString without losing any +Unicode information then you should use <a href="qdeepcopy.html">QDeepCopy</a>. +<p> <p>See also <a href="qchar.html">QChar</a>, <a href="qcstring.html">QCString</a>, <a href="qbytearray.html">QByteArray</a>, <a href="qconststring.html">QConstString</a>, <a href="shared.html">Implicitly and Explicitly Shared Classes</a>, <a href="text.html">Text Related Classes</a>, and <a href="tools.html">Non-GUI Classes</a>. + +<hr><h2>Member Type Documentation</h2> +<h3 class=fn><a name="SectionFlags-enum"></a>QString::SectionFlags</h3> + +<ul> +<li><tt>QString::SectionDefault</tt> - Empty fields are counted, leading and +trailing separators are not included, and the separator is +compared case sensitively. +<li><tt>QString::SectionSkipEmpty</tt> - Treat empty fields as if they don't exist, +i.e. they are not considered as far as <em>start</em> and <em>end</em> are +concerned. +<li><tt>QString::SectionIncludeLeadingSep</tt> - Include the leading separator (if +any) in the result string. +<li><tt>QString::SectionIncludeTrailingSep</tt> - Include the trailing separator +(if any) in the result string. +<li><tt>QString::SectionCaseInsensitiveSeps</tt> - Compare the separator +case-insensitively. +</ul><p> Any of the last four values can be OR-ed together to form a flag. +<p> <p>See also <a href="#section">section</a>(). + +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="QString"></a>QString::QString () +</h3> + +<p> Constructs a null string, i.e. both the length and data pointer +are 0. +<p> <p>See also <a href="#isNull">isNull</a>(). + +<h3 class=fn><a name="QString-2"></a>QString::QString ( <a href="qchar.html">QChar</a> ch ) +</h3> +Constructs a string of length one, containing the character <em>ch</em>. + +<h3 class=fn><a name="QString-3"></a>QString::QString ( const <a href="qstring.html">QString</a> & s ) +</h3> +Constructs an <a href="shclass.html#implicitly-shared">implicitly shared</a> copy of <em>s</em>. This is very fast +since it only involves incrementing a reference count. + +<h3 class=fn><a name="QString-4"></a>QString::QString ( const <a href="qbytearray.html">QByteArray</a> & ba ) +</h3> +Constructs a string that is a <a href="shclass.html#deep-copy">deep copy</a> of <em>ba</em> interpreted as a +classic C string. + +<h3 class=fn><a name="QString-5"></a>QString::QString ( const <a href="qchar.html">QChar</a> * unicode, uint length ) +</h3> +Constructs a string that is a <a href="shclass.html#deep-copy">deep copy</a> of the first <em>length</em> +characters in the <a href="qchar.html">QChar</a> array. +<p> If <em>unicode</em> and <em>length</em> are 0, then a null string is created. +<p> If only <em>unicode</em> is 0, the string is empty but has <em>length</em> +characters of space preallocated: QString expands automatically +anyway, but this may speed up some cases a little. We recommend +using the plain constructor and <a href="#setLength">setLength</a>() for this purpose since +it will result in more readable code. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#setLength">setLength</a>(). + +<h3 class=fn><a name="QString-6"></a>QString::QString ( const char * str ) +</h3> +Constructs a string that is a <a href="shclass.html#deep-copy">deep copy</a> of <em>str</em>, interpreted as +a classic C string. The encoding is assumed to be Latin-1, unless +you change it using <a href="qtextcodec.html#setCodecForCStrings">QTextCodec::setCodecForCStrings</a>(). +<p> If <em>str</em> is 0, then a null string is created. +<p> This is a cast constructor, but it is perfectly safe: converting a +Latin-1 <tt>const char *</tt> to QString preserves all the information. You +can disable this constructor by defining <tt>QT_NO_CAST_ASCII</tt> when +you compile your applications. You can also make QString objects +by using <a href="#setLatin1">setLatin1</a>(), <a href="#fromLatin1">fromLatin1</a>(), <a href="#fromLocal8Bit">fromLocal8Bit</a>(), and +<a href="#fromUtf8">fromUtf8</a>(). Or whatever encoding is appropriate for the 8-bit data +you have. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#fromAscii">fromAscii</a>(). + +<h3 class=fn><a name="QString-7"></a>QString::QString ( const std::string & str ) +</h3> +Constructs a string that is a <a href="shclass.html#deep-copy">deep copy</a> of <em>str</em>. +<p> This is the same as <a href="#fromAscii">fromAscii</a>(<em>str</em>). + +<h3 class=fn><a name="~QString"></a>QString::~QString () +</h3> + +<p> Destroys the string and frees the string's data if this is the +last reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="append"></a>QString::append ( const <a href="qstring.html">QString</a> & str ) +</h3> + +<p> Appends <em>str</em> to the string and returns a reference to the +result. +<p> <pre> + string = "Test"; + string.append( "ing" ); // string == "Testing" + </pre> + +<p> Equivalent to <a href="#operator+-eq">operator+=</a>(). + +<p>Example: <a href="dirview-example.html#x1701">dirview/dirview.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> & <a name="append-2"></a>QString::append ( char ch ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Appends character <em>ch</em> to the string and returns a reference to +the result. +<p> Equivalent to <a href="#operator+-eq">operator+=</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="append-3"></a>QString::append ( <a href="qchar.html">QChar</a> ch ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Appends character <em>ch</em> to the string and returns a reference to +the result. +<p> Equivalent to <a href="#operator+-eq">operator+=</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="append-4"></a>QString::append ( const <a href="qbytearray.html">QByteArray</a> & str ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Appends <em>str</em> to the string and returns a reference to the result. +<p> Equivalent to <a href="#operator+-eq">operator+=</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="append-5"></a>QString::append ( const char * str ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Appends <em>str</em> to the string and returns a reference to the result. +<p> Equivalent to <a href="#operator+-eq">operator+=</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="append-6"></a>QString::append ( const std::string & str ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Appends <em>str</em> to the string and returns a reference to the result. +<p> Equivalent to <a href="#operator+-eq">operator+=</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg"></a>QString::arg ( const <a href="qstring.html">QString</a> & a, int fieldWidth = 0 ) const +</h3> +This function will return a string that replaces the lowest +numbered occurrence of <tt>%1</tt>, <tt>%2</tt>, ..., <tt>%9</tt> with <em>a</em>. +<p> The <em>fieldWidth</em> value specifies the minimum amount of space that +<em>a</em> is padded to. A positive value will produce right-aligned +text, whereas a negative value will produce left-aligned text. +<p> The following example shows how we could create a 'status' string +when processing a list of files: +<pre> + QString status = <a href="#QString">QString</a>( "Processing file %1 of %2: %3" ) + .arg( i ) // current file's number + .arg( total ) // number of files to process + .arg( fileName ); // current file's name + </pre> + +<p> It is generally fine to use filenames and numbers as we have done +in the example above. But note that using <a href="#arg">arg</a>() to construct +natural language sentences does not usually translate well into +other languages because sentence structure and word order often +differ between languages. +<p> If there is no place marker (<tt>%1</tt>, <tt>%2</tt>, etc.), a warning +message (<a href="qapplication.html#qWarning">qWarning</a>()) is output and the result is undefined. +<p> <b>Warning:</b> If any placeholder occurs more than once, the result is undefined. +<p> +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-2"></a>QString::arg ( long a, int fieldWidth = 0, int base = 10 ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> The <em>fieldWidth</em> value specifies the minimum amount of space that +<em>a</em> is padded to. A positive value will produce a right-aligned +number, whereas a negative value will produce a left-aligned +number. +<p> <em>a</em> is expressed in base <em>base</em>, which is 10 by default and must +be between 2 and 36. +<p> The '%' can be followed by an 'L', in which case the sequence is +replaced with a localized representation of <em>a</em>. The conversion +uses the default locale. The default locale is determined from the +system's locale settings at application startup. It can be changed +using <a href="qlocale.html#setDefault">QLocale::setDefault</a>(). The 'L' flag is ignored if <em>base</em> is +not 10. +<p> <pre> + QString str; + str = <a href="#QString">QString</a>( "Decimal 63 is %1 in hexadecimal" ) + .arg( 63, 0, 16 ); + // str == "Decimal 63 is 3f in hexadecimal" + + QLocale::<a href="qlocale.html#setDefault">setDefault</a>(QLocale::English, QLocale::UnitedStates); + str = <a href="#QString">QString</a>( "%1 %L2 %L3" ) + .arg( 12345 ) + .arg( 12345 ) + .arg( 12345, 0, 16 ); + // str == "12345 12,345 3039" + </pre> + + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-3"></a>QString::arg ( ulong a, int fieldWidth = 0, int base = 10 ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <em>a</em> is expressed in base <em>base</em>, which is 10 by default and must +be between 2 and 36. If <em>base</em> is 10, the '%L' syntax can be used +to produce localized strings. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-4"></a>QString::arg ( Q_LLONG a, int fieldWidth = 0, int base = 10 ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <em>a</em> is expressed in base <em>base</em>, which is 10 by default and must +be between 2 and 36. If <em>base</em> is 10, the '%L' syntax can be used +to produce localized strings. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-5"></a>QString::arg ( Q_ULLONG a, int fieldWidth = 0, int base = 10 ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <em>a</em> is expressed in base <em>base</em>, which is 10 by default and must +be between 2 and 36. If <em>base</em> is 10, the '%L' syntax can be used +to produce localized strings. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-6"></a>QString::arg ( int a, int fieldWidth = 0, int base = 10 ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <em>a</em> is expressed in base <em>base</em>, which is 10 by default and must +be between 2 and 36. If <em>base</em> is 10, the '%L' syntax can be used +to produce localized strings. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-7"></a>QString::arg ( uint a, int fieldWidth = 0, int base = 10 ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <em>a</em> is expressed in base <em>base</em>, which is 10 by default and must +be between 2 and 36. If <em>base</em> is 10, the '%L' syntax can be used +to produce localized strings. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-8"></a>QString::arg ( short a, int fieldWidth = 0, int base = 10 ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <em>a</em> is expressed in base <em>base</em>, which is 10 by default and must +be between 2 and 36. If <em>base</em> is 10, the '%L' syntax can be used +to produce localized strings. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-9"></a>QString::arg ( ushort a, int fieldWidth = 0, int base = 10 ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <em>a</em> is expressed in base <em>base</em>, which is 10 by default and must +be between 2 and 36. If <em>base</em> is 10, the '%L' syntax can be used +to produce localized strings. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-a"></a>QString::arg ( double a, int fieldWidth = 0, char fmt = 'g', int prec = -1 ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <a name="arg-formats"></a> +<p> Argument <em>a</em> is formatted according to the <em>fmt</em> format specified, +which is 'g' by default and can be any of the following: +<p> <center><table cellpadding="4" cellspacing="2" border="0"> +<tr bgcolor="#a2c511"> <th valign="top">Format <th valign="top">Meaning +<tr bgcolor="#f0f0f0"> <td valign="top"><tt>e</tt> <td valign="top">format as [-]9.9e[+|-]999 +<tr bgcolor="#d0d0d0"> <td valign="top"><tt>E</tt> <td valign="top">format as [-]9.9E[+|-]999 +<tr bgcolor="#f0f0f0"> <td valign="top"><tt>f</tt> <td valign="top">format as [-]9.9 +<tr bgcolor="#d0d0d0"> <td valign="top"><tt>g</tt> <td valign="top">use <tt>e</tt> or <tt>f</tt> format, whichever is the most concise +<tr bgcolor="#f0f0f0"> <td valign="top"><tt>G</tt> <td valign="top">use <tt>E</tt> or <tt>f</tt> format, whichever is the most concise +</table></center> +<p> With 'e', 'E', and 'f', <em>prec</em> is the number of digits after the +decimal point. With 'g' and 'G', <em>prec</em> is the maximum number of +significant digits (trailing zeroes are omitted). +<p> <pre> + double d = 12.34; + QString ds = <a href="#QString">QString</a>( "'E' format, precision 3, gives %1" ) + .arg( d, 0, 'E', 3 ); + // ds == "'E' format, precision 3, gives 1.234E+01" + </pre> + +<p> The '%L' syntax can be used to produce localized strings. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-b"></a>QString::arg ( char a, int fieldWidth = 0 ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <em>a</em> is assumed to be in the Latin-1 character set. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-c"></a>QString::arg ( <a href="qchar.html">QChar</a> a, int fieldWidth = 0 ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-d"></a>QString::arg ( const <a href="qstring.html">QString</a> & a1, const <a href="qstring.html">QString</a> & a2 ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> This is the same as str.<a href="#arg">arg</a>(<em>a1</em>).arg(<em>a2</em>), except that +the strings are replaced in one pass. This can make a difference +if <em>a1</em> contains e.g. <tt>%1</tt>: +<p> <pre> + QString str( "%1 %2" ); + str.<a href="#arg">arg</a>( "Hello", "world" ); // returns "Hello world" + str.<a href="#arg">arg</a>( "Hello" ).arg( "world" ); // returns "Hello world" + + str.<a href="#arg">arg</a>( "(%1)", "Hello" ); // returns "(%1) Hello" + str.<a href="#arg">arg</a>( "(%1)" ).arg( "Hello" ); // returns "(Hello) %2" + </pre> + + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-e"></a>QString::arg ( const <a href="qstring.html">QString</a> & a1, const <a href="qstring.html">QString</a> & a2, const <a href="qstring.html">QString</a> & a3 ) const +</h3> + +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> This is the same as calling str.<a href="#arg">arg</a>(<em>a1</em>).arg(<em>a2</em>).arg(<em>a3</em>), +except that the strings are replaced in one pass. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="arg-f"></a>QString::arg ( const <a href="qstring.html">QString</a> & a1, const <a href="qstring.html">QString</a> & a2, const <a href="qstring.html">QString</a> & a3, const <a href="qstring.html">QString</a> & a4 ) const +</h3> + +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> This is the same as calling +str.<a href="#arg">arg</a>(<em>a1</em>).arg(<em>a2</em>).arg(<em>a3</em>).arg(<em>a4</em>), +except that the strings are replaced in one pass. + +<h3 class=fn>const char * <a name="ascii"></a>QString::ascii () const +</h3> +Returns an 8-bit ASCII representation of the string. +<p> If a codec has been set using <a href="qtextcodec.html#codecForCStrings">QTextCodec::codecForCStrings</a>(), +it is used to convert Unicode to 8-bit char. Otherwise, this function +does the same as <a href="#latin1">latin1</a>(). +<p> <p>See also <a href="#fromAscii">fromAscii</a>(), <a href="#latin1">latin1</a>(), <a href="#utf8">utf8</a>(), and <a href="#local8Bit">local8Bit</a>(). + +<p>Example: <a href="networkprotocol-example.html#x690">network/networkprotocol/nntp.cpp</a>. +<h3 class=fn><a href="qchar.html">QChar</a> <a name="at"></a>QString::at ( uint i ) const +</h3> + +<p> Returns the character at index <em>i</em>, or 0 if <em>i</em> is beyond the +length of the string. +<p> <pre> + const QString string( "abcdefgh" ); + <a href="qchar.html">QChar</a> ch = string.<a href="#at">at</a>( 4 ); + // ch == 'e' + </pre> + +<p> If the QString is not const (i.e. const QString) or const& (i.e. +const QString &), then the non-const overload of <a href="#at">at</a>() will be used +instead. + +<h3 class=fn><a href="qcharref.html">QCharRef</a> <a name="at-2"></a>QString::at ( uint i ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> The function returns a reference to the character at index <em>i</em>. +The resulting reference can then be assigned to, or used +immediately, but it will become invalid once further modifications +are made to the original string. +<p> If <em>i</em> is beyond the length of the string then the string is +expanded with QChar::null. + +<h3 class=fn>uint <a name="capacity"></a>QString::capacity () const +</h3> + +<p> Returns the number of characters this string can hold +in the allocated memory. +<p> <p>See also <a href="#reserve">reserve</a>() and <a href="#squeeze">squeeze</a>(). + +<h3 class=fn>int <a name="compare"></a>QString::compare ( const <a href="qstring.html">QString</a> & s1, const <a href="qstring.html">QString</a> & s2 )<tt> [static]</tt> +</h3> + +<p> Lexically compares <em>s1</em> with <em>s2</em> and returns an integer less +than, equal to, or greater than zero if <em>s1</em> is less than, equal +to, or greater than <em>s2</em>. +<p> The comparison is based exclusively on the numeric Unicode values +of the characters and is very fast, but is not what a human would +expect. Consider sorting user-interface strings with +<a href="#localeAwareCompare">QString::localeAwareCompare</a>(). +<p> <pre> + int a = QString::<a href="#compare">compare</a>( "def", "abc" ); // a > 0 + int b = QString::<a href="#compare">compare</a>( "abc", "def" ); // b < 0 + int c = QString::<a href="#compare">compare</a>( "abc", "abc" ); // c == 0 + </pre> + + +<h3 class=fn>int <a name="compare-2"></a>QString::compare ( const <a href="qstring.html">QString</a> & s ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Lexically compares this string with <em>s</em> and returns an integer +less than, equal to, or greater than zero if it is less than, equal +to, or greater than <em>s</em>. + +<h3 class=fn>void <a name="compose"></a>QString::compose () +</h3> +<b>Warning:</b> This function is not supported in Qt 3.x. It is provided +for experimental and illustrative purposes only. It is mainly of +interest to those experimenting with Arabic and other +composition-rich texts. +<p> Applies possible ligatures to a QString. Useful when +composition-rich text requires rendering with glyph-poor fonts, +but it also makes compositions such as <a href="qchar.html">QChar</a>(0x0041) ('A') and +QChar(0x0308) (Unicode accent diaresis), giving QChar(0x00c4) +(German A Umlaut). + +<h3 class=fn><a href="qchar.html">QChar</a> <a name="constref"></a>QString::constref ( uint i ) const +</h3> + +<p> Returns the <a href="qchar.html">QChar</a> at index <em>i</em> by value. +<p> Equivalent to <a href="#at">at</a>(<em>i</em>). +<p> <p>See also <a href="#ref">ref</a>(). + +<h3 class=fn>int <a name="contains"></a>QString::contains ( <a href="qchar.html">QChar</a> c, bool cs = TRUE ) const +</h3> +Returns the number of times the character <em>c</em> occurs in the +string. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> <pre> + QString string( "Trolltech and Qt" ); + int n = string.<a href="#contains">contains</a>( 't', FALSE ); + // n == 3 + </pre> + + +<p>Examples: <a href="fileiconview-example.html#x867">fileiconview/qfileiconview.cpp</a> and <a href="mdi-example.html#x2064">mdi/application.cpp</a>. +<h3 class=fn>int <a name="contains-2"></a>QString::contains ( char c, bool cs = TRUE ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<h3 class=fn>int <a name="contains-3"></a>QString::contains ( const char * str, bool cs = TRUE ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Returns the number of times the string <em>str</em> occurs in the string. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. + +<h3 class=fn>int <a name="contains-4"></a>QString::contains ( const <a href="qstring.html">QString</a> & str, bool cs = TRUE ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Returns the number of times <em>str</em> occurs in the string. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> This function counts overlapping strings, so in the example below, +there are two instances of "ana" in "bananas". +<p> <pre> + QString str( "bananas" ); + int i = str.<a href="#contains">contains</a>( "ana" ); // i == 2 + </pre> + +<p> <p>See also <a href="#findRev">findRev</a>(). + +<h3 class=fn>int <a name="contains-5"></a>QString::contains ( const <a href="qregexp.html">QRegExp</a> & rx ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Returns the number of times the regexp, <em>rx</em>, matches in the +string. +<p> This function counts overlapping matches, so in the example below, +there are four instances of "ana" or "ama". +<p> <pre> + QString str = "banana and panama"; + <a href="qregexp.html">QRegExp</a> rxp = QRegExp( "a[nm]a", TRUE, FALSE ); + int i = str.<a href="#contains">contains</a>( rxp ); // i == 4 + </pre> + +<p> <p>See also <a href="#find">find</a>() and <a href="#findRev">findRev</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="copy"></a>QString::copy () const +</h3> + +<p> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code. +<p> In Qt 2.0 and later, all calls to this function are needless. Just +remove them. + +<h3 class=fn>const char * <a name="data"></a>QString::data () const +</h3> + +<p> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code. +<p> Returns a pointer to a '\0'-terminated classic C string. +<p> In Qt 1.x, this returned a char* allowing direct manipulation of the +string as a sequence of bytes. In Qt 2.x where QString is a Unicode +string, char* conversion constructs a temporary string, and hence +direct character operations are meaningless. + +<h3 class=fn>bool <a name="endsWith"></a>QString::endsWith ( const <a href="qstring.html">QString</a> & s, bool cs = TRUE ) const +</h3> +Returns TRUE if the string ends with <em>s</em>; otherwise returns +FALSE. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> <pre> + QString str( "Bananas" ); + str.<a href="#endsWith">endsWith</a>( "anas" ); // returns TRUE + str.<a href="#endsWith">endsWith</a>( "pple" ); // returns FALSE + </pre> + +<p> <p>See also <a href="#startsWith">startsWith</a>(). + +<p>Example: <a href="tutorial2-04.html#x2561">chart/main.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> & <a name="fill"></a>QString::fill ( <a href="qchar.html">QChar</a> c, int len = -1 ) +</h3> +Fills the string with <em>len</em> characters of value <em>c</em>, and returns +a reference to the string. +<p> If <em>len</em> is negative (the default), the current string length is +used. +<p> <pre> + QString str; + str.<a href="#fill">fill</a>( 'g', 5 ); // string == "ggggg" + </pre> + + +<h3 class=fn>int <a name="find"></a>QString::find ( const <a href="qregexp.html">QRegExp</a> & rx, int index = 0 ) const +</h3> +Finds the first match of the <a href="qregexp.html#regular-expression">regular expression</a> <em>rx</em>, starting +from position <em>index</em>. If <em>index</em> is -1, the search starts at +the last character; if -2, at the next to last character and so +on. (See <a href="#findRev">findRev</a>() for searching backwards.) +<p> Returns the position of the first match of <em>rx</em> or -1 if no match +was found. +<p> <pre> + QString string( "bananas" ); + int i = string.<a href="#find">find</a>( QRegExp("an"), 0 ); // i == 1 + </pre> + +<p> <p>See also <a href="#findRev">findRev</a>(), <a href="#replace">replace</a>(), and <a href="#contains">contains</a>(). + +<p>Example: <a href="mail-example.html#x715">network/mail/smtp.cpp</a>. +<h3 class=fn>int <a name="find-2"></a>QString::find ( <a href="qchar.html">QChar</a> c, int index = 0, bool cs = TRUE ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Finds the first occurrence of the character <em>c</em>, starting at +position <em>index</em>. If <em>index</em> is -1, the search starts at the +last character; if -2, at the next to last character and so on. +(See <a href="#findRev">findRev</a>() for searching backwards.) +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> Returns the position of <em>c</em> or -1 if <em>c</em> could not be found. + +<h3 class=fn>int <a name="find-3"></a>QString::find ( char c, int index = 0, bool cs = TRUE ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Find character <em>c</em> starting from position <em>index</em>. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. + +<h3 class=fn>int <a name="find-4"></a>QString::find ( const <a href="qstring.html">QString</a> & str, int index = 0, bool cs = TRUE ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Finds the first occurrence of the string <em>str</em>, starting at +position <em>index</em>. If <em>index</em> is -1, the search starts at the +last character, if it is -2, at the next to last character and so +on. (See <a href="#findRev">findRev</a>() for searching backwards.) +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> Returns the position of <em>str</em> or -1 if <em>str</em> could not be found. + +<h3 class=fn>int <a name="find-5"></a>QString::find ( const char * str, int index = 0 ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Equivalent to <a href="#find">find</a>(QString(<em>str</em>), <em>index</em>). + +<h3 class=fn>int <a name="findRev"></a>QString::findRev ( const char * str, int index = -1 ) const +</h3> + +<p> Equivalent to <a href="#findRev">findRev</a>(QString(<em>str</em>), <em>index</em>). + +<h3 class=fn>int <a name="findRev-2"></a>QString::findRev ( <a href="qchar.html">QChar</a> c, int index = -1, bool cs = TRUE ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Finds the first occurrence of the character <em>c</em>, starting at +position <em>index</em> and searching backwards. If the index is -1, the +search starts at the last character, if it is -2, at the next to +last character and so on. +<p> Returns the position of <em>c</em> or -1 if <em>c</em> could not be found. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> <pre> + QString string( "bananas" ); + int i = string.<a href="#findRev">findRev</a>( 'a' ); // i == 5 + </pre> + + +<h3 class=fn>int <a name="findRev-3"></a>QString::findRev ( char c, int index = -1, bool cs = TRUE ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Find character <em>c</em> starting from position <em>index</em> and working +backwards. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. + +<h3 class=fn>int <a name="findRev-4"></a>QString::findRev ( const <a href="qstring.html">QString</a> & str, int index = -1, bool cs = TRUE ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Finds the first occurrence of the string <em>str</em>, starting at +position <em>index</em> and searching backwards. If the index is -1, the +search starts at the last character, if it is -2, at the next to +last character and so on. +<p> Returns the position of <em>str</em> or -1 if <em>str</em> could not be found. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> <pre> + QString string("bananas"); + int i = string.<a href="#findRev">findRev</a>( "ana" ); // i == 3 + </pre> + + +<h3 class=fn>int <a name="findRev-5"></a>QString::findRev ( const <a href="qregexp.html">QRegExp</a> & rx, int index = -1 ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Finds the first match of the regexp <em>rx</em>, starting at position <em>index</em> and searching backwards. If the index is -1, the search +starts at the last character, if it is -2, at the next to last +character and so on. (See <a href="#findRev">findRev</a>() for searching backwards.) +<p> Returns the position of the match or -1 if no match was found. +<p> <pre> + QString string( "bananas" ); + int i = string.<a href="#findRev">findRev</a>( QRegExp("an") ); // i == 3 + </pre> + +<p> <p>See also <a href="#find">find</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="fromAscii"></a>QString::fromAscii ( const char * ascii, int len = -1 )<tt> [static]</tt> +</h3> +Returns the Unicode string decoded from the first <em>len</em> +bytes of <em>ascii</em>, ignoring the rest of <em>ascii</em>. If <em>len</em> +is -1 then the length of <em>ascii</em> is used. If <em>len</em> is bigger +than the length of <em>ascii</em> then it will use the length of <em>ascii</em>. +<p> If a codec has been set using <a href="qtextcodec.html#codecForCStrings">QTextCodec::codecForCStrings</a>(), +it is used to convert the string from 8-bit characters to Unicode. +Otherwise, this function does the same as <a href="#fromLatin1">fromLatin1</a>(). +<p> This is the same as the QString(const char*) constructor, but you +can make that constructor invisible if you compile with the define +<tt>QT_NO_CAST_ASCII</tt>, in which case you can explicitly create a +QString from 8-bit ASCII text using this function. +<p> <pre> + QString str = QString::<a href="#fromAscii">fromAscii</a>( "123456789", 5 ); + // str == "12345" + </pre> + + +<h3 class=fn><a href="qstring.html">QString</a> <a name="fromLatin1"></a>QString::fromLatin1 ( const char * chars, int len = -1 )<tt> [static]</tt> +</h3> +Returns the Unicode string decoded from the first <em>len</em> +bytes of <em>chars</em>, ignoring the rest of <em>chars</em>. If <em>len</em> +is -1 then the length of <em>chars</em> is used. If <em>len</em> is bigger +than the length of <em>chars</em> then it will use the length of <em>chars</em>. +<p> <p>See also <a href="#fromAscii">fromAscii</a>(). + +<p>Examples: <a href="listbox-example.html#x1446">listbox/listbox.cpp</a> and <a href="mail-example.html#x716">network/mail/smtp.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> <a name="fromLocal8Bit"></a>QString::fromLocal8Bit ( const char * local8Bit, int len = -1 )<tt> [static]</tt> +</h3> +Returns the Unicode string decoded from the first <em>len</em> +bytes of <em>local8Bit</em>, ignoring the rest of <em>local8Bit</em>. If +<em>len</em> is -1 then the length of <em>local8Bit</em> is used. If <em>len</em> is +bigger than the length of <em>local8Bit</em> then it will use the length +of <em>local8Bit</em>. +<p> <pre> + QString str = QString::<a href="#fromLocal8Bit">fromLocal8Bit</a>( "123456789", 5 ); + // str == "12345" + </pre> + +<p> <em>local8Bit</em> is assumed to be encoded in a locale-specific format. +<p> See <a href="qtextcodec.html">QTextCodec</a> for more diverse coding/decoding of Unicode strings. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="fromUcs2"></a>QString::fromUcs2 ( const unsigned short * str )<tt> [static]</tt> +</h3> +Constructs a string that is a <a href="shclass.html#deep-copy">deep copy</a> of <em>str</em>, interpreted as a +UCS2 encoded, zero terminated, Unicode string. +<p> If <em>str</em> is 0, then a null string is created. +<p> <p>See also <a href="#isNull">isNull</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="fromUtf8"></a>QString::fromUtf8 ( const char * utf8, int len = -1 )<tt> [static]</tt> +</h3> +Returns the Unicode string decoded from the first <em>len</em> +bytes of <em>utf8</em>, ignoring the rest of <em>utf8</em>. If <em>len</em> is +-1 then the length of <em>utf8</em> is used. If <em>len</em> is bigger than +the length of <em>utf8</em> then it will use the length of <em>utf8</em>. +<p> <pre> + QString str = QString::<a href="#fromUtf8">fromUtf8</a>( "123456789", 5 ); + // str == "12345" + </pre> + +<p> See <a href="qtextcodec.html">QTextCodec</a> for more diverse coding/decoding of Unicode strings. + +<p>Example: <a href="simple-font-demo-example.html#x2850">fonts/simple-qfont-demo/viewer.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> & <a name="insert"></a>QString::insert ( uint index, const <a href="qstring.html">QString</a> & s ) +</h3> +Inserts <em>s</em> into the string at position <em>index</em>. +<p> If <em>index</em> is beyond the end of the string, the string is +extended with spaces to length <em>index</em> and <em>s</em> is then appended +and returns a reference to the string. +<p> <pre> + QString string( "I like fish" ); + str = string.<a href="#insert">insert</a>( 2, "don't " ); + // str == "I don't like fish" + </pre> + +<p> <p>See also <a href="#remove">remove</a>() and <a href="#replace">replace</a>(). + +<p>Examples: <a href="themes-example.html#x337">themes/themes.cpp</a> and <a href="xform-example.html#x1264">xform/xform.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> & <a name="insert-2"></a>QString::insert ( uint index, const <a href="qbytearray.html">QByteArray</a> & s ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Inserts <em>s</em> into the string at position <em>index</em> and returns +a reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="insert-3"></a>QString::insert ( uint index, const char * s ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Inserts <em>s</em> into the string at position <em>index</em> and returns +a reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="insert-4"></a>QString::insert ( uint index, const <a href="qchar.html">QChar</a> * s, uint len ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Inserts the first <em>len</em> characters in <em>s</em> into the string at +position <em>index</em> and returns a reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="insert-5"></a>QString::insert ( uint index, <a href="qchar.html">QChar</a> c ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Insert <em>c</em> into the string at position <em>index</em> and returns a +reference to the string. +<p> If <em>index</em> is beyond the end of the string, the string is +extended with spaces (ASCII 32) to length <em>index</em> and <em>c</em> is +then appended. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="insert-6"></a>QString::insert ( uint index, char c ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Insert character <em>c</em> at position <em>index</em>. + +<h3 class=fn>bool <a name="isEmpty"></a>QString::isEmpty () const +</h3> + +<p> Returns TRUE if the string is empty, i.e. if <a href="#length">length</a>() == 0; +otherwise returns FALSE. Null strings are also empty. +<p> <pre> + QString a( "" ); + a.<a href="#isEmpty">isEmpty</a>(); // TRUE + a.<a href="#isNull">isNull</a>(); // FALSE + + QString b; + b.<a href="#isEmpty">isEmpty</a>(); // TRUE + b.<a href="#isNull">isNull</a>(); // TRUE + </pre> + +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#length">length</a>(). + +<p>Examples: <a href="addressbook-example.html#x571">addressbook/mainwindow.cpp</a>, <a href="canvas-chart-example.html#x2892">chart/chartform.cpp</a>, <a href="tutorial2-06.html#x2576">chart/chartform_canvas.cpp</a>, <a href="networkprotocol-example.html#x691">network/networkprotocol/nntp.cpp</a>, <a href="qmag-example.html#x1792">qmag/qmag.cpp</a>, and <a href="qwerty-example.html#x390">qwerty/qwerty.cpp</a>. +<h3 class=fn>bool <a name="isNull"></a>QString::isNull () const +</h3> + +<p> Returns TRUE if the string is null; otherwise returns FALSE. A +null string is always empty. +<p> <pre> + QString a; // a.<a href="#unicode">unicode</a>() == 0, a.<a href="#length">length</a>() == 0 + a.<a href="#isNull">isNull</a>(); // TRUE, because a.<a href="#unicode">unicode</a>() == 0 + a.<a href="#isEmpty">isEmpty</a>(); // TRUE, because a.<a href="#length">length</a>() == 0 + </pre> + +<p> <p>See also <a href="#isEmpty">isEmpty</a>() and <a href="#length">length</a>(). + +<p>Examples: <a href="i18n-example.html#x1948">i18n/main.cpp</a>, <a href="ftpclient-example.html#x771">network/ftpclient/ftpmainwindow.ui.h</a>, and <a href="qdir-example.html#x1842">qdir/qdir.cpp</a>. +<h3 class=fn>const char * <a name="latin1"></a>QString::latin1 () const +</h3> +Returns a Latin-1 representation of the string. The +returned value is undefined if the string contains non-Latin-1 +characters. If you want to convert strings into formats other than +Unicode, see the <a href="qtextcodec.html">QTextCodec</a> classes. +<p> This function is mainly useful for boot-strapping legacy code to +use Unicode. +<p> The result remains valid so long as one unmodified copy of the +source string exists. +<p> <p>See also <a href="#fromLatin1">fromLatin1</a>(), <a href="#ascii">ascii</a>(), <a href="#utf8">utf8</a>(), and <a href="#local8Bit">local8Bit</a>(). + +<p>Examples: <a href="fileiconview-example.html#x869">fileiconview/qfileiconview.cpp</a> and <a href="networkprotocol-example.html#x692">network/networkprotocol/nntp.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> <a name="left"></a>QString::left ( uint len ) const +</h3> +Returns a substring that contains the <em>len</em> leftmost characters +of the string. +<p> The whole string is returned if <em>len</em> exceeds the length of the +string. +<p> <pre> + QString s = "Pineapple"; + QString t = s.<a href="#left">left</a>( 4 ); // t == "Pine" + </pre> + +<p> <p>See also <a href="#right">right</a>(), <a href="#mid">mid</a>(), and <a href="#isEmpty">isEmpty</a>(). + +<p>Example: <a href="themes-example.html#x338">themes/themes.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> <a name="leftJustify"></a>QString::leftJustify ( uint width, <a href="qchar.html">QChar</a> fill = ' ', bool truncate = FALSE ) const +</h3> +Returns a string of length <em>width</em> that contains this string +padded by the <em>fill</em> character. +<p> If <em>truncate</em> is FALSE and the length of the string is more than +<em>width</em>, then the returned string is a copy of the string. +<p> If <em>truncate</em> is TRUE and the length of the string is more than +<em>width</em>, then any characters in a copy of the string after length +<em>width</em> are removed, and the copy is returned. +<p> <pre> + QString s( "apple" ); + QString t = s.<a href="#leftJustify">leftJustify</a>( 8, '.' ); // t == "apple..." + </pre> + +<p> <p>See also <a href="#rightJustify">rightJustify</a>(). + +<h3 class=fn>uint <a name="length"></a>QString::length () const +</h3> + +<p> Returns the length of the string. +<p> Null strings and empty strings have zero length. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<p>Examples: <a href="dirview-example.html#x1702">dirview/dirview.cpp</a>, <a href="fileiconview-example.html#x870">fileiconview/qfileiconview.cpp</a>, <a href="networkprotocol-example.html#x693">network/networkprotocol/nntp.cpp</a>, <a href="rot-example.html#x1372">rot13/rot13.cpp</a>, and <a href="themes-example.html#x339">themes/themes.cpp</a>. +<h3 class=fn><a href="qcstring.html">QCString</a> <a name="local8Bit"></a>QString::local8Bit () const +</h3> +Returns the string encoded in a locale-specific format. On X11, +this is the <a href="qtextcodec.html#codecForLocale">QTextCodec::codecForLocale</a>(). On Windows, it is a +system-defined encoding. On Mac OS X, this always uses UTF-8 as +the encoding. +<p> See <a href="qtextcodec.html">QTextCodec</a> for more diverse coding/decoding of Unicode +strings. +<p> <p>See also <a href="#fromLocal8Bit">fromLocal8Bit</a>(), <a href="#ascii">ascii</a>(), <a href="#latin1">latin1</a>(), and <a href="#utf8">utf8</a>(). + +<h3 class=fn>int <a name="localeAwareCompare"></a>QString::localeAwareCompare ( const <a href="qstring.html">QString</a> & s1, const <a href="qstring.html">QString</a> & s2 )<tt> [static]</tt> +</h3> + +<p> Compares <em>s1</em> with <em>s2</em> and returns an integer less than, equal +to, or greater than zero if <em>s1</em> is less than, equal to, or +greater than <em>s2</em>. +<p> The comparison is performed in a locale- and also +platform-dependent manner. Use this function to present sorted +lists of strings to the user. +<p> <p>See also <a href="#compare">QString::compare</a>() and <a href="qtextcodec.html#locale">QTextCodec::locale</a>(). + +<h3 class=fn>int <a name="localeAwareCompare-2"></a>QString::localeAwareCompare ( const <a href="qstring.html">QString</a> & s ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Compares this string with <em>s</em>. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="lower"></a>QString::lower () const +</h3> +Returns a lowercase copy of the string. +<p> <pre> + QString string( "TROlltECH" ); + str = string.<a href="#lower">lower</a>(); // str == "trolltech" + </pre> + +<p> <p>See also <a href="#upper">upper</a>(). + +<p>Example: <a href="scribble-example.html#x941">scribble/scribble.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> <a name="mid"></a>QString::mid ( uint index, uint len = 0xffffffff ) const +</h3> +Returns a string that contains the <em>len</em> characters of this +string, starting at position <em>index</em>. +<p> Returns a null string if the string is empty or <em>index</em> is out of +range. Returns the whole string from <em>index</em> if <em>index</em> + <em>len</em> +exceeds the length of the string. +<p> <pre> + QString s( "Five pineapples" ); + QString t = s.<a href="#mid">mid</a>( 5, 4 ); // t == "pine" + </pre> + +<p> <p>See also <a href="#left">left</a>() and <a href="#right">right</a>(). + +<p>Examples: <a href="mail-example.html#x717">network/mail/smtp.cpp</a>, <a href="qmag-example.html#x1793">qmag/qmag.cpp</a>, and <a href="themes-example.html#x340">themes/themes.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> <a name="number"></a>QString::number ( long n, int base = 10 )<tt> [static]</tt> +</h3> +A convenience function that returns a string equivalent of the +number <em>n</em> to base <em>base</em>, which is 10 by default and must be +between 2 and 36. The returned string is in "C" locale. +<p> <pre> + long a = 63; + QString str = QString::<a href="#number">number</a>( a, 16 ); // str == "3f" + QString str = QString::<a href="#number">number</a>( a, 16 ).upper(); // str == "3F" + </pre> + +<p> <p>See also <a href="#setNum">setNum</a>(). + +<p>Examples: <a href="simple-application-example.html#x1580">application/application.cpp</a>, <a href="canvas-chart-example.html#x2893">chart/chartform.cpp</a>, <a href="simple-font-demo-example.html#x2851">fonts/simple-qfont-demo/viewer.cpp</a>, <a href="helpviewer-example.html#x1018">helpviewer/helpwindow.cpp</a>, <a href="mdi-example.html#x2066">mdi/application.cpp</a>, <a href="regexptester-example.html#x2496">regexptester/regexptester.cpp</a>, and <a href="sql.html#x2193">sql/overview/extract/main.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> <a name="number-2"></a>QString::number ( ulong n, int base = 10 )<tt> [static]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <p>See also <a href="#setNum">setNum</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="number-3"></a>QString::number ( Q_LLONG n, int base = 10 )<tt> [static]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <p>See also <a href="#setNum">setNum</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="number-4"></a>QString::number ( Q_ULLONG n, int base = 10 )<tt> [static]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <p>See also <a href="#setNum">setNum</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="number-5"></a>QString::number ( int n, int base = 10 )<tt> [static]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> <p>See also <a href="#setNum">setNum</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="number-6"></a>QString::number ( uint n, int base = 10 )<tt> [static]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> A convenience factory function that returns a string +representation of the number <em>n</em> to the base <em>base</em>, which is 10 +by default and must be between 2 and 36. +<p> <p>See also <a href="#setNum">setNum</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="number-7"></a>QString::number ( double n, char f = 'g', int prec = 6 )<tt> [static]</tt> +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Argument <em>n</em> is formatted according to the <em>f</em> format specified, +which is <tt>g</tt> by default, and can be any of the following: +<p> <center><table cellpadding="4" cellspacing="2" border="0"> +<tr bgcolor="#a2c511"> <th valign="top">Format <th valign="top">Meaning +<tr bgcolor="#f0f0f0"> <td valign="top"><tt>e</tt> <td valign="top">format as [-]9.9e[+|-]999 +<tr bgcolor="#d0d0d0"> <td valign="top"><tt>E</tt> <td valign="top">format as [-]9.9E[+|-]999 +<tr bgcolor="#f0f0f0"> <td valign="top"><tt>f</tt> <td valign="top">format as [-]9.9 +<tr bgcolor="#d0d0d0"> <td valign="top"><tt>g</tt> <td valign="top">use <tt>e</tt> or <tt>f</tt> format, whichever is the most concise +<tr bgcolor="#f0f0f0"> <td valign="top"><tt>G</tt> <td valign="top">use <tt>E</tt> or <tt>f</tt> format, whichever is the most concise +</table></center> +<p> With 'e', 'E', and 'f', <em>prec</em> is the number of digits after the +decimal point. With 'g' and 'G', <em>prec</em> is the maximum number of +significant digits (trailing zeroes are omitted). +<p> <pre> + double d = 12.34; + QString ds = <a href="#QString">QString</a>( "'E' format, precision 3, gives %1" ) + .arg( d, 0, 'E', 3 ); + // ds == "1.234E+001" + </pre> + +<p> <p>See also <a href="#setNum">setNum</a>(). + +<h3 class=fn><a name="operator-const-char-*"></a>QString::operator const char * () const +</h3> + +<p> Returns <a href="#ascii">ascii</a>(). Be sure to see the warnings documented in the +ascii() function. Note that for new code which you wish to be +strictly Unicode-clean, you can define the macro <tt>QT_NO_ASCII_CAST</tt> when compiling your code to hide this function so +that automatic casts are not done. This has the added advantage +that you catch the programming error described in <a href="#operator!">operator!</a>(). + +<h3 class=fn><a name="operator-std::string"></a>QString::operator std::string () const +</h3> + +<p> Returns <a href="#ascii">ascii</a>() as a std::string. +<p> <b>Warning:</b> The function may cause an application to crash if a static C run-time is in use. +This can happen in Microsoft Visual C++ if Qt is configured as single-threaded. A safe +alternative is to call ascii() directly and construct a std::string manually. + +<h3 class=fn>bool <a name="operator!"></a>QString::operator! () const +</h3> + +<p> Returns TRUE if this is a null string; otherwise returns FALSE. +<p> <pre> + QString name = getName(); + if ( !name ) + name = "Rodney"; + </pre> + +<p> Note that if you say +<p> <pre> + QString name = getName(); + if ( name ) + doSomethingWith(name); + </pre> + +<p> It will call "operator const char*()", which is inefficent; you +may wish to define the macro <tt>QT_NO_ASCII_CAST</tt> when writing code +which you wish to remain Unicode-clean. +<p> When you want the above semantics, use: +<p> <pre> + QString name = getName(); + if ( !name.<a href="#isNull">isNull</a>() ) + doSomethingWith(name); + </pre> + +<p> <p>See also <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator+-eq"></a>QString::operator+= ( const <a href="qstring.html">QString</a> & str ) +</h3> +Appends <em>str</em> to the string and returns a reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator+-eq-2"></a>QString::operator+= ( const <a href="qbytearray.html">QByteArray</a> & str ) +</h3> + +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Appends <em>str</em> to the string and returns a reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator+-eq-3"></a>QString::operator+= ( const char * str ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Appends <em>str</em> to the string and returns a reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator+-eq-4"></a>QString::operator+= ( const std::string & str ) +</h3> + +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Appends <em>str</em> to the string and returns a reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator+-eq-5"></a>QString::operator+= ( <a href="qchar.html">QChar</a> c ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Appends <em>c</em> to the string and returns a reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator+-eq-6"></a>QString::operator+= ( char c ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Appends <em>c</em> to the string and returns a reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator-eq"></a>QString::operator= ( <a href="qchar.html">QChar</a> c ) +</h3> + +<p> Sets the string to contain just the single character <em>c</em>. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator-eq-2"></a>QString::operator= ( const <a href="qstring.html">QString</a> & s ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Assigns a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>s</em> to this string and returns a +reference to this string. This is very fast because the string +isn't actually copied. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator-eq-3"></a>QString::operator= ( const char * str ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Assigns a <a href="shclass.html#deep-copy">deep copy</a> of <em>str</em>, interpreted as a classic C string +to this string and returns a reference to this string. +<p> If <em>str</em> is 0, then a null string is created. +<p> <p>See also <a href="#isNull">isNull</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator-eq-4"></a>QString::operator= ( const std::string & s ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Makes a <a href="shclass.html#deep-copy">deep copy</a> of <em>s</em> and returns a reference to the deep +copy. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator-eq-5"></a>QString::operator= ( const <a href="qcstring.html">QCString</a> & cstr ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Assigns a <a href="shclass.html#deep-copy">deep copy</a> of <em>cstr</em>, interpreted as a classic C +string, to this string. Returns a reference to this string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="operator-eq-6"></a>QString::operator= ( char c ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Sets the string to contain just the single character <em>c</em>. + +<h3 class=fn><a href="qchar.html">QChar</a> <a name="operator[]"></a>QString::operator[] ( int i ) const +</h3> + +<p> Returns the character at index <em>i</em>, or QChar::null if <em>i</em> is +beyond the length of the string. +<p> If the QString is not const (i.e., const QString) or const& +(i.e., const QString&), then the non-const overload of operator[] +will be used instead. + +<h3 class=fn><a href="qcharref.html">QCharRef</a> <a name="operator[]-2"></a>QString::operator[] ( int i ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> The function returns a reference to the character at index <em>i</em>. +The resulting reference can then be assigned to, or used +immediately, but it will become invalid once further modifications +are made to the original string. +<p> If <em>i</em> is beyond the length of the string then the string is +expanded with QChar::nulls, so that the <a href="qcharref.html">QCharRef</a> references a +valid (null) character in the string. +<p> The QCharRef internal class can be used much like a constant +<a href="qchar.html">QChar</a>, but if you assign to it, you change the original string +(which will detach itself because of QString's copy-on-write +semantics). You will get compilation errors if you try to use the +result as anything but a QChar. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="prepend"></a>QString::prepend ( const <a href="qstring.html">QString</a> & s ) +</h3> + +<p> Inserts <em>s</em> at the beginning of the string and returns a +reference to the string. +<p> Equivalent to <a href="#insert">insert</a>(0, <em>s</em>). +<p> <pre> + QString string = "42"; + string.<a href="#prepend">prepend</a>( "The answer is " ); + // string == "The answer is 42" + </pre> + +<p> <p>See also <a href="#insert">insert</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="prepend-2"></a>QString::prepend ( char ch ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Inserts <em>ch</em> at the beginning of the string and returns a +reference to the string. +<p> Equivalent to <a href="#insert">insert</a>(0, <em>ch</em>). +<p> <p>See also <a href="#insert">insert</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="prepend-3"></a>QString::prepend ( <a href="qchar.html">QChar</a> ch ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Inserts <em>ch</em> at the beginning of the string and returns a +reference to the string. +<p> Equivalent to <a href="#insert">insert</a>(0, <em>ch</em>). +<p> <p>See also <a href="#insert">insert</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="prepend-4"></a>QString::prepend ( const <a href="qbytearray.html">QByteArray</a> & s ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Inserts <em>s</em> at the beginning of the string and returns a reference to the string. +<p> Equivalent to <a href="#insert">insert</a>(0, <em>s</em>). +<p> <p>See also <a href="#insert">insert</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="prepend-5"></a>QString::prepend ( const char * s ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Inserts <em>s</em> at the beginning of the string and returns a reference to the string. +<p> Equivalent to <a href="#insert">insert</a>(0, <em>s</em>). +<p> <p>See also <a href="#insert">insert</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="prepend-6"></a>QString::prepend ( const std::string & s ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Inserts <em>s</em> at the beginning of the string and returns a reference to the string. +<p> Equivalent to <a href="#insert">insert</a>(0, <em>s</em>). +<p> <p>See also <a href="#insert">insert</a>(). + +<h3 class=fn><a href="qchar.html">QChar</a> & <a name="ref"></a>QString::ref ( uint i ) +</h3> + +<p> Returns the <a href="qchar.html">QChar</a> at index <em>i</em> by reference, expanding the string +with QChar::null if necessary. The resulting reference can be +assigned to, or otherwise used immediately, but becomes invalid +once furher modifications are made to the string. +<p> <pre> + QString string("ABCDEF"); + <a href="qchar.html">QChar</a> ch = string.<a href="#ref">ref</a>( 3 ); // ch == 'D' + </pre> + +<p> <p>See also <a href="#constref">constref</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="remove"></a>QString::remove ( uint index, uint len ) +</h3> +Removes <em>len</em> characters from the string starting at position <em>index</em>, and returns a reference to the string. +<p> If <em>index</em> is beyond the length of the string, nothing happens. +If <em>index</em> is within the string, but <em>index</em> + <em>len</em> is beyond +the end of the string, the string is truncated at position <em>index</em>. +<p> <pre> + QString string( "Montreal" ); + string.<a href="#remove">remove</a>( 1, 4 ); // string == "Meal" + </pre> + +<p> <p>See also <a href="#insert">insert</a>() and <a href="#replace">replace</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="remove-2"></a>QString::remove ( const <a href="qstring.html">QString</a> & str, bool cs = TRUE ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Removes every occurrence of <em>str</em> in the string. Returns a +reference to the string. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> This is the same as <a href="#replace">replace</a>(<em>str</em>, "", <em>cs</em>). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="remove-3"></a>QString::remove ( <a href="qchar.html">QChar</a> c ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Removes every occurrence of the character <em>c</em> in the string. +Returns a reference to the string. +<p> This is the same as <a href="#replace">replace</a>(<em>c</em>, ""). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="remove-4"></a>QString::remove ( char c ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Removes every occurrence of the character <em>c</em> in the string. +Returns a reference to the string. +<p> This is the same as <a href="#replace">replace</a>(<em>c</em>, ""). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="remove-5"></a>QString::remove ( const char * str ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Removes every occurrence of <em>str</em> in the string. Returns a +reference to the string. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="remove-6"></a>QString::remove ( const <a href="qregexp.html">QRegExp</a> & rx ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Removes every occurrence of the <a href="qregexp.html#regular-expression">regular expression</a> <em>rx</em> in the +string. Returns a reference to the string. +<p> This is the same as <a href="#replace">replace</a>(<em>rx</em>, ""). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="replace"></a>QString::replace ( uint index, uint len, const <a href="qstring.html">QString</a> & s ) +</h3> +Replaces <em>len</em> characters from the string with <em>s</em>, starting at +position <em>index</em>, and returns a reference to the string. +<p> If <em>index</em> is beyond the length of the string, nothing is deleted +and <em>s</em> is appended at the end of the string. If <em>index</em> is +valid, but <em>index</em> + <em>len</em> is beyond the end of the string, +the string is truncated at position <em>index</em>, then <em>s</em> is +appended at the end. +<p> <pre> + QString string( "Say yes!" ); + string = string.<a href="#replace">replace</a>( 4, 3, "NO" ); + // string == "Say NO!" + </pre> + +<p> <b>Warning:</b> Qt 3.3.3 and earlier had different semantics for the +case <em>index</em> >= <a href="#length">length</a>(), which contradicted the documentation. +To avoid portability problems between Qt 3 versions and with Qt +4, we recommend that you never call the function with <em>index</em> >= +length(). +<p> <p>See also <a href="#insert">insert</a>() and <a href="#remove">remove</a>(). + +<p>Examples: <a href="listviews-example.html#x162">listviews/listviews.cpp</a>, <a href="networkprotocol-example.html#x694">network/networkprotocol/nntp.cpp</a>, <a href="qmag-example.html#x1794">qmag/qmag.cpp</a>, and <a href="regexptester-example.html#x2497">regexptester/regexptester.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> & <a name="replace-2"></a>QString::replace ( uint index, uint len, const <a href="qchar.html">QChar</a> * s, uint slen ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Replaces <em>len</em> characters with <em>slen</em> characters of <a href="qchar.html">QChar</a> data +from <em>s</em>, starting at position <em>index</em>, and returns a reference +to the string. +<p> <p>See also <a href="#insert">insert</a>() and <a href="#remove">remove</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="replace-3"></a>QString::replace ( uint index, uint len, <a href="qchar.html">QChar</a> c ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> This is the same as <a href="#replace">replace</a>(<em>index</em>, <em>len</em>, QString(<em>c</em>)). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="replace-4"></a>QString::replace ( uint index, uint len, char c ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> This is the same as <a href="#replace">replace</a>(<em>index</em>, <em>len</em>, <a href="qchar.html">QChar</a>(<em>c</em>)). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="replace-5"></a>QString::replace ( <a href="qchar.html">QChar</a> c, const <a href="qstring.html">QString</a> & after, bool cs = TRUE ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Replaces every occurrence of the character <em>c</em> in the string +with <em>after</em>. Returns a reference to the string. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> Example: +<pre> + QString s = "a,b,c"; + s.<a href="#replace">replace</a>( QChar(','), " or " ); + // s == "a or b or c" + </pre> + + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="replace-6"></a>QString::replace ( char c, const <a href="qstring.html">QString</a> & after, bool cs = TRUE ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Replaces every occurrence of the character <em>c</em> in the string +with <em>after</em>. Returns a reference to the string. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="replace-7"></a>QString::replace ( const <a href="qstring.html">QString</a> & before, const <a href="qstring.html">QString</a> & after, bool cs = TRUE ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Replaces every occurrence of the string <em>before</em> in the string +with the string <em>after</em>. Returns a reference to the string. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> Example: +<pre> + QString s = "Greek is Greek"; + s.<a href="#replace">replace</a>( "Greek", "English" ); + // s == "English is English" + </pre> + + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="replace-8"></a>QString::replace ( const <a href="qregexp.html">QRegExp</a> & rx, const <a href="qstring.html">QString</a> & after ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Replaces every occurrence of the regexp <em>rx</em> in the string with +<em>after</em>. Returns a reference to the string. For example: +<pre> + QString s = "banana"; + s.<a href="#replace">replace</a>( QRegExp("an"), "" ); + // s == "ba" + </pre> + +<p> For regexps containing <a href="qregexp.html#capturing-text">capturing + parentheses</a>, occurrences of <b>\1</b>, <b>\2</b>, ..., +in <em>after</em> are replaced with <em>rx</em>.cap(1), cap(2), ... +<p> <pre> + QString t = "A <i>bon mot</i>."; + t.<a href="#replace">replace</a>( QRegExp("<i>([^<]*)</i>"), "\\emph{\\1}" ); + // t == "A \\emph{bon mot}." + </pre> + +<p> <p>See also <a href="#find">find</a>(), <a href="#findRev">findRev</a>(), and <a href="qregexp.html#cap">QRegExp::cap</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="replace-9"></a>QString::replace ( <a href="qchar.html">QChar</a> c1, <a href="qchar.html">QChar</a> c2 ) +</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Replaces every occurrence of <em>c1</em> with the char <em>c2</em>. Returns a +reference to the string. + +<h3 class=fn>void <a name="reserve"></a>QString::reserve ( uint minCapacity ) +</h3> +Ensures that at least <em>minCapacity</em> characters are allocated to +the string. +<p> This function is useful for code that needs to build up a long +string and wants to avoid repeated reallocation. In this example, +we want to add to the string until some condition is true, and +we're fairly sure that size is big enough: +<pre> + QString result; + int len = 0; + result.<a href="#reserve">reserve</a>(maxLen); + while (...) { + result[len++] = ... // fill part of the space + } + result.<a href="#squeeze">squeeze</a>(); + </pre> + +<p> If <em>maxLen</em> is an underestimate, the worst that will happen is +that the loop will slow down. +<p> If it is not possible to allocate enough memory, the string +remains unchanged. +<p> <p>See also <a href="#capacity">capacity</a>(), <a href="#squeeze">squeeze</a>(), and <a href="#setLength">setLength</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="right"></a>QString::right ( uint len ) const +</h3> +Returns a string that contains the <em>len</em> rightmost characters of +the string. +<p> If <em>len</em> is greater than the length of the string then the whole +string is returned. +<p> <pre> + QString string( "Pineapple" ); + QString t = string.<a href="#right">right</a>( 5 ); // t == "apple" + </pre> + +<p> <p>See also <a href="#left">left</a>(), <a href="#mid">mid</a>(), and <a href="#isEmpty">isEmpty</a>(). + +<p>Example: <a href="fileiconview-example.html#x871">fileiconview/qfileiconview.cpp</a>. +<h3 class=fn><a href="qstring.html">QString</a> <a name="rightJustify"></a>QString::rightJustify ( uint width, <a href="qchar.html">QChar</a> fill = ' ', bool truncate = FALSE ) const +</h3> +Returns a string of length <em>width</em> that contains the <em>fill</em> +character followed by the string. +<p> If <em>truncate</em> is FALSE and the length of the string is more than +<em>width</em>, then the returned string is a copy of the string. +<p> If <em>truncate</em> is TRUE and the length of the string is more than +<em>width</em>, then the resulting string is truncated at position <em>width</em>. +<p> <pre> + QString string( "apple" ); + QString t = string.<a href="#rightJustify">rightJustify</a>( 8, '.' ); // t == "...apple" + </pre> + +<p> <p>See also <a href="#leftJustify">leftJustify</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="section"></a>QString::section ( <a href="qchar.html">QChar</a> sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const +</h3> + +<p> This function returns a section of the string. +<p> This string is treated as a sequence of fields separated by the +character, <em>sep</em>. The returned string consists of the fields from +position <em>start</em> to position <em>end</em> inclusive. If <em>end</em> is not +specified, all fields from position <em>start</em> to the end of the +string are included. Fields are numbered 0, 1, 2, etc., counting +from the left, and -1, -2, etc., counting from right to left. +<p> The <em>flags</em> argument can be used to affect some aspects of the +function's behaviour, e.g. whether to be case sensitive, whether +to skip empty fields and how to deal with leading and trailing +separators; see <a href="#SectionFlags-enum">SectionFlags</a>. +<p> <pre> + QString csv( "forename,middlename,surname,phone" ); + QString s = csv.<a href="#section">section</a>( ',', 2, 2 ); // s == "surname" + + QString path( "/usr/local/bin/myapp" ); // First field is empty + QString s = path.<a href="#section">section</a>( '/', 3, 4 ); // s == "bin/myapp" + QString s = path.<a href="#section">section</a>( '/', 3, 3, SectionSkipEmpty ); // s == "myapp" + </pre> + +<p> If <em>start</em> or <em>end</em> is negative, we count fields from the right +of the string, the right-most field being -1, the one from +right-most field being -2, and so on. +<p> <pre> + QString csv( "forename,middlename,surname,phone" ); + QString s = csv.<a href="#section">section</a>( ',', -3, -2 ); // s == "middlename,surname" + + QString path( "/usr/local/bin/myapp" ); // First field is empty + QString s = path.<a href="#section">section</a>( '/', -1 ); // s == "myapp" + </pre> + +<p> <p>See also <a href="qstringlist.html#split">QStringList::split</a>(). + +<p>Examples: <a href="tutorial2-03.html#x2551">chart/element.cpp</a> and <a href="ftpclient-example.html#x772">network/ftpclient/ftpmainwindow.ui.h</a>. +<h3 class=fn><a href="qstring.html">QString</a> <a name="section-2"></a>QString::section ( char sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<h3 class=fn><a href="qstring.html">QString</a> <a name="section-3"></a>QString::section ( const char * sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<h3 class=fn><a href="qstring.html">QString</a> <a name="section-4"></a>QString::section ( const <a href="qstring.html">QString</a> & sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> This function returns a section of the string. +<p> This string is treated as a sequence of fields separated by the +string, <em>sep</em>. The returned string consists of the fields from +position <em>start</em> to position <em>end</em> inclusive. If <em>end</em> is not +specified, all fields from position <em>start</em> to the end of the +string are included. Fields are numbered 0, 1, 2, etc., counting +from the left, and -1, -2, etc., counting from right to left. +<p> The <em>flags</em> argument can be used to affect some aspects of the +function's behaviour, e.g. whether to be case sensitive, whether +to skip empty fields and how to deal with leading and trailing +separators; see <a href="#SectionFlags-enum">SectionFlags</a>. +<p> <pre> + QString data( "forename**middlename**surname**phone" ); + QString s = data.<a href="#section">section</a>( "**", 2, 2 ); // s == "surname" + </pre> + +<p> If <em>start</em> or <em>end</em> is negative, we count fields from the right +of the string, the right-most field being -1, the one from +right-most field being -2, and so on. +<p> <pre> + QString data( "forename**middlename**surname**phone" ); + QString s = data.<a href="#section">section</a>( "**", -3, -2 ); // s == "middlename**surname" + </pre> + +<p> <p>See also <a href="qstringlist.html#split">QStringList::split</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="section-5"></a>QString::section ( const <a href="qregexp.html">QRegExp</a> & reg, int start, int end = 0xffffffff, int flags = SectionDefault ) const +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> This function returns a section of the string. +<p> This string is treated as a sequence of fields separated by the +<a href="qregexp.html#regular-expression">regular expression</a>, <em>reg</em>. The returned string consists of the +fields from position <em>start</em> to position <em>end</em> inclusive. If <em>end</em> is not specified, all fields from position <em>start</em> to the end +of the string are included. Fields are numbered 0, 1, 2, etc., counting +from the left, and -1, -2, etc., counting from right to left. +<p> The <em>flags</em> argument can be used to affect some aspects of the +function's behaviour, e.g. whether to be case sensitive, whether +to skip empty fields and how to deal with leading and trailing +separators; see <a href="#SectionFlags-enum">SectionFlags</a>. +<p> <pre> + QString line( "forename\tmiddlename surname \t \t phone" ); + <a href="qregexp.html">QRegExp</a> sep( "\s+" ); + QString s = line.<a href="#section">section</a>( sep, 2, 2 ); // s == "surname" + </pre> + +<p> If <em>start</em> or <em>end</em> is negative, we count fields from the right +of the string, the right-most field being -1, the one from +right-most field being -2, and so on. +<p> <pre> + QString line( "forename\tmiddlename surname \t \t phone" ); + <a href="qregexp.html">QRegExp</a> sep( "\\s+" ); + QString s = line.<a href="#section">section</a>( sep, -3, -2 ); // s == "middlename surname" + </pre> + +<p> <b>Warning:</b> Using this <a href="qregexp.html">QRegExp</a> version is much more expensive than +the overloaded string and character versions. +<p> <p>See also <a href="qstringlist.html#split">QStringList::split</a>() and <a href="#simplifyWhiteSpace">simplifyWhiteSpace</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setAscii"></a>QString::setAscii ( const char * str, int len = -1 ) +</h3> +Sets this string to <em>str</em>, interpreted as a classic 8-bit ASCII C +string. If <em>len</em> is -1 (the default), then it is set to +strlen(str). +<p> If <em>str</em> is 0 a null string is created. If <em>str</em> is "", an empty +string is created. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>void <a name="setExpand"></a>QString::setExpand ( uint index, <a href="qchar.html">QChar</a> c ) +</h3> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code. +<p> Sets the character at position <em>index</em> to <em>c</em> and expands the +string if necessary, filling with spaces. +<p> This method is redundant in Qt 3.x, because operator[] will expand +the string as necessary. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setLatin1"></a>QString::setLatin1 ( const char * str, int len = -1 ) +</h3> +Sets this string to <em>str</em>, interpreted as a classic Latin-1 C +string. If <em>len</em> is -1 (the default), then it is set to +strlen(str). +<p> If <em>str</em> is 0 a null string is created. If <em>str</em> is "", an empty +string is created. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>void <a name="setLength"></a>QString::setLength ( uint newLen ) +</h3> +Ensures that at least <em>newLen</em> characters are allocated to the +string, and sets the length of the string to <em>newLen</em>. Any new +space allocated contains arbitrary data. +<p> <p>See also <a href="#reserve">reserve</a>() and <a href="#truncate">truncate</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setNum"></a>QString::setNum ( Q_LLONG n, int base = 10 ) +</h3> +Sets the string to the printed value of <em>n</em> in base <em>base</em> and +returns a reference to the string. The returned string is in "C" locale. +<p> The base is 10 by default and must be between 2 and 36. +<p> <pre> + QString string; + string = string.<a href="#setNum">setNum</a>( 1234 ); // string == "1234" + </pre> + + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setNum-2"></a>QString::setNum ( short n, int base = 10 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Sets the string to the printed value of <em>n</em> in base <em>base</em> and +returns a reference to the string. +<p> The base is 10 by default and must be between 2 and 36. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setNum-3"></a>QString::setNum ( ushort n, int base = 10 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Sets the string to the printed value of <em>n</em> in base <em>base</em> and +returns a reference to the string. +<p> The base is 10 by default and must be between 2 and 36. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setNum-4"></a>QString::setNum ( int n, int base = 10 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Sets the string to the printed value of <em>n</em> in base <em>base</em> and +returns a reference to the string. +<p> The base is 10 by default and must be between 2 and 36. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setNum-5"></a>QString::setNum ( uint n, int base = 10 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Sets the string to the printed value of <em>n</em> in base <em>base</em> and +returns a reference to the string. +<p> The base is 10 by default and must be between 2 and 36. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setNum-6"></a>QString::setNum ( long n, int base = 10 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setNum-7"></a>QString::setNum ( ulong n, int base = 10 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setNum-8"></a>QString::setNum ( Q_ULLONG n, int base = 10 ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Sets the string to the printed value of <em>n</em> in base <em>base</em> and +returns a reference to the string. +<p> The base is 10 by default and must be between 2 and 36. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setNum-9"></a>QString::setNum ( float n, char f = 'g', int prec = 6 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Sets the string to the printed value of <em>n</em>, formatted in format +<em>f</em> with precision <em>prec</em>, and returns a reference to the +string. +<p> The format <em>f</em> can be 'f', 'F', 'e', 'E', 'g' or 'G'. See <a href="#arg-formats">arg</a>() for an explanation of the formats. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setNum-a"></a>QString::setNum ( double n, char f = 'g', int prec = 6 ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Sets the string to the printed value of <em>n</em>, formatted in format +<em>f</em> with precision <em>prec</em>, and returns a reference to the +string. +<p> The format <em>f</em> can be 'f', 'F', 'e', 'E', 'g' or 'G'. See <a href="#arg-formats">arg</a>() for an explanation of the formats. + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setUnicode"></a>QString::setUnicode ( const <a href="qchar.html">QChar</a> * unicode, uint len ) +</h3> +Resizes the string to <em>len</em> characters and copies <em>unicode</em> into +the string. If <em>unicode</em> is 0, nothing is copied, but the +string is still resized to <em>len</em>. If <em>len</em> is zero, then the +string becomes a <a href="#isNull">null</a> string. +<p> <p>See also <a href="#setLatin1">setLatin1</a>() and <a href="#isNull">isNull</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="setUnicodeCodes"></a>QString::setUnicodeCodes ( const ushort * unicode_as_ushorts, uint len ) +</h3> +Resizes the string to <em>len</em> characters and copies <em>unicode_as_ushorts</em> into the string (on some X11 client platforms +this will involve a byte-swapping pass). +<p> If <em>unicode_as_ushorts</em> is 0, nothing is copied, but the string +is still resized to <em>len</em>. If <em>len</em> is zero, the string becomes +a <a href="#isNull">null</a> string. +<p> <p>See also <a href="#setLatin1">setLatin1</a>() and <a href="#isNull">isNull</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="simplifyWhiteSpace"></a>QString::simplifyWhiteSpace () const +</h3> +Returns a string that has whitespace removed from the start and +the end, and which has each sequence of internal whitespace +replaced with a single space. +<p> Whitespace means any character for which <a href="qchar.html#isSpace">QChar::isSpace</a>() returns +TRUE. This includes Unicode characters with decimal values 9 +(TAB), 10 (LF), 11 (VT), 12 (FF), 13 (CR), and 32 (Space). +<p> <pre> + QString string = " lots\t of\nwhite space "; + QString t = string.<a href="#simplifyWhiteSpace">simplifyWhiteSpace</a>(); + // t == "lots of white space" + </pre> + +<p> <p>See also <a href="#stripWhiteSpace">stripWhiteSpace</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> & <a name="sprintf"></a>QString::sprintf ( const char * cformat, ... ) +</h3> +Safely builds a formatted string from the format string <em>cformat</em> +and an arbitrary list of arguments. The format string supports all +the escape sequences of printf() in the standard C library. +<p> The %s escape sequence expects a <a href="#utf8">utf8</a>() encoded string. The format +string <em>cformat</em> is expected to be in latin1. If you need a +Unicode format string, use <a href="#arg">arg</a>() instead. For typesafe string +building, with full Unicode support, you can use <a href="qtextostream.html">QTextOStream</a> like +this: +<p> <pre> + QString str; + QString s = ...; + int x = ...; + QTextOStream( &str ) << s << " : " << x; + </pre> + +<p> For <a href="qobject.html#tr">translations,</a> especially if the +strings contains more than one escape sequence, you should +consider using the arg() function instead. This allows the order +of the replacements to be controlled by the translator, and has +Unicode support. +<p> The %lc escape sequence expects a unicode character of type ushort +(as returned by <a href="qchar.html#unicode">QChar::unicode</a>()). +The %ls escape sequence expects a pointer to a zero-terminated +array of unicode characters of type ushort (as returned by +<a href="#ucs2">QString::ucs2</a>()). +<p> <p>See also <a href="#arg">arg</a>(). + +<p>Examples: <a href="dclock-example.html#x1103">dclock/dclock.cpp</a>, <a href="forever-example.html#x1052">forever/forever.cpp</a>, <a href="layout-example.html#x542">layout/layout.cpp</a>, <a href="qmag-example.html#x1795">qmag/qmag.cpp</a>, <a href="scrollview-example.html#x656">scrollview/scrollview.cpp</a>, <a href="tooltip-example.html#x449">tooltip/tooltip.cpp</a>, and <a href="xform-example.html#x1265">xform/xform.cpp</a>. +<h3 class=fn>void <a name="squeeze"></a>QString::squeeze () +</h3> +Squeezes the string's capacity to the current content. +<p> <p>See also <a href="#capacity">capacity</a>() and <a href="#reserve">reserve</a>(). + +<h3 class=fn>bool <a name="startsWith"></a>QString::startsWith ( const <a href="qstring.html">QString</a> & s, bool cs = TRUE ) const +</h3> +Returns TRUE if the string starts with <em>s</em>; otherwise returns +FALSE. +<p> If <em>cs</em> is TRUE (the default), the search is case sensitive; +otherwise the search is case insensitive. +<p> <pre> + QString str( "Bananas" ); + str.<a href="#startsWith">startsWith</a>( "Ban" ); // returns TRUE + str.<a href="#startsWith">startsWith</a>( "Car" ); // returns FALSE + </pre> + +<p> <p>See also <a href="#endsWith">endsWith</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="stripWhiteSpace"></a>QString::stripWhiteSpace () const +</h3> +Returns a string that has whitespace removed from the start and +the end. +<p> Whitespace means any character for which <a href="qchar.html#isSpace">QChar::isSpace</a>() returns +TRUE. This includes Unicode characters with decimal values 9 +(TAB), 10 (LF), 11 (VT), 12 (FF), 13 (CR) and 32 (Space), and may +also include other Unicode characters. +<p> <pre> + QString string = " white space "; + QString s = string.<a href="#stripWhiteSpace">stripWhiteSpace</a>(); // s == "white space" + </pre> + +<p> <p>See also <a href="#simplifyWhiteSpace">simplifyWhiteSpace</a>(). + +<h3 class=fn>double <a name="toDouble"></a>QString::toDouble ( bool * ok = 0 ) const +</h3> +Returns the string converted to a <tt>double</tt> value. +<p> If <em>ok</em> is not 0: if a conversion error occurs, <em>*ok</em> is set to +FALSE; otherwise <em>*ok</em> is set to TRUE. +<p> <pre> + QString string( "1234.56" ); + double a = string.<a href="#toDouble">toDouble</a>(); // a == 1234.56 + </pre> + +<p> The string-to-number functions: +<ul> +<li> <a href="#toShort">toShort</a>() +<li> <a href="#toUShort">toUShort</a>() +<li> <a href="#toInt">toInt</a>() +<li> <a href="#toUInt">toUInt</a>() +<li> <a href="#toLong">toLong</a>() +<li> <a href="#toULong">toULong</a>() +<li> <a href="#toLongLong">toLongLong</a>() +<li> <a href="#toULongLong">toULongLong</a>() +<li> <a href="#toFloat">toFloat</a>() +<li> <a href="#toDouble">toDouble</a>() +</ul> +can handle numbers +represented in various locales. These representations may use different +characters for the decimal point, thousands group sepearator +and even individual digits. QString's functions try to interpret +the string according to the current locale. The current locale is +determined from the system at application startup and can be changed +by calling <a href="qlocale.html#setDefault">QLocale::setDefault</a>(). If the string cannot be interpreted +according to the current locale, this function falls back +on the "C" locale. +<p> <pre> + bool ok; + double d; + + QLocale::<a href="qlocale.html#setDefault">setDefault</a>(QLocale::C); + d = <a href="#QString">QString</a>( "1234,56" ).toDouble(&ok); // ok == false + d = <a href="#QString">QString</a>( "1234.56" ).toDouble(&ok); // ok == true, d == 1234.56 + + QLocale::<a href="qlocale.html#setDefault">setDefault</a>(QLocale::German); + d = <a href="#QString">QString</a>( "1234,56" ).toDouble(&ok); // ok == true, d == 1234.56 + d = <a href="#QString">QString</a>( "1234.56" ).toDouble(&ok); // ok == true, d == 1234.56 + </pre> + +<p> Due to the ambiguity between the decimal point and thousands group +separator in various locales, these functions do not handle +thousands group separators. If you need to convert such numbers, +use the corresponding function in <a href="qlocale.html">QLocale</a>. +<p> <pre> + bool ok; + QLocale::<a href="qlocale.html#setDefault">setDefault</a>(QLocale::C); + double d = <a href="#QString">QString</a>( "1,234,567.89" ).toDouble(&ok); // ok == false + </pre> + +<p> <b>Warning:</b> If the string contains trailing whitespace this function +will fail, and set <em>*ok</em> to false if <em>ok</em> is not 0. Leading +whitespace is ignored. +<p> <p>See also <a href="#number">number</a>(), <a href="qlocale.html#setDefault">QLocale::setDefault</a>(), <a href="qlocale.html#toDouble">QLocale::toDouble</a>(), and <a href="#stripWhiteSpace">stripWhiteSpace</a>(). + +<h3 class=fn>float <a name="toFloat"></a>QString::toFloat ( bool * ok = 0 ) const +</h3> +Returns the string converted to a <tt>float</tt> value. +<p> Returns 0.0 if the conversion fails. +<p> If <em>ok</em> is not 0: if a conversion error occurs, <em>*ok</em> is set to +FALSE; otherwise <em>*ok</em> is set to TRUE. +<p> For information on how string-to-number functions in QString handle +localized input, see <a href="#toDouble">toDouble</a>(). +<p> <b>Warning:</b> If the string contains trailing whitespace this function +will fail, settings <em>*ok</em> to false if <em>ok</em> is not 0. +Leading whitespace is ignored. +<p> <p>See also <a href="#number">number</a>(). + +<h3 class=fn>int <a name="toInt"></a>QString::toInt ( bool * ok = 0, int base = 10 ) const +</h3> +Returns the string converted to an <tt>int</tt> using base <em>base</em>, which is 10 by default and must be between 2 and 36 or 0. If +<em>base</em> is 0, the base is determined automatically using the +following rules: +<ul> +<li>If the string begins with "0x", it is assumed to +be hexadecimal; +<li>If it begins with "0", it is assumed to be octal; +<li>Otherwise it is assumed to be decimal. +</ul> +<p> Returns 0 if the conversion fails. +<p> If <em>ok</em> is not 0: if a conversion error occurs, <em>*ok</em> is set to +FALSE; otherwise <em>*ok</em> is set to TRUE. +<p> <pre> + QString str( "FF" ); + bool ok; + int hex = str.<a href="#toInt">toInt</a>( &ok, 16 ); // hex == 255, ok == TRUE + int dec = str.<a href="#toInt">toInt</a>( &ok, 10 ); // dec == 0, ok == FALSE + </pre> + +<p> Leading and trailing whitespace is ignored by this function. +<p> For information on how string-to-number functions in QString handle +localized input, see <a href="#toDouble">toDouble</a>(). +<p> <p>See also <a href="#number">number</a>(). + +<h3 class=fn>long <a name="toLong"></a>QString::toLong ( bool * ok = 0, int base = 10 ) const +</h3> +Returns the string converted to a <tt>long</tt> using base <em>base</em>, which is 10 by default and must be between 2 and 36 or 0. If +<em>base</em> is 0, the base is determined automatically using the +following rules: +<ul> +<li>If the string begins with "0x", it is assumed to +be hexadecimal; +<li>If it begins with "0", it is assumed to be octal; +<li>Otherwise it is assumed to be decimal. +</ul> +<p> Returns 0 if the conversion fails. +<p> If <em>ok</em> is not 0: if a conversion error occurs, <em>*ok</em> is set to +FALSE; otherwise <em>*ok</em> is set to TRUE. +<p> Leading and trailing whitespace is ignored by this function. +<p> For information on how string-to-number functions in QString handle +localized input, see <a href="#toDouble">toDouble</a>(). +<p> <p>See also <a href="#number">number</a>(). + +<h3 class=fn>Q_LLONG <a name="toLongLong"></a>QString::toLongLong ( bool * ok = 0, int base = 10 ) const +</h3> +Returns the string converted to a <tt>long long</tt> using base <em>base</em>, which is 10 by default and must be between 2 and 36 or 0. If +<em>base</em> is 0, the base is determined automatically using the +following rules: +<ul> +<li>If the string begins with "0x", it is assumed to +be hexadecimal; +<li>If it begins with "0", it is assumed to be octal; +<li>Otherwise it is assumed to be decimal. +</ul> +<p> Returns 0 if the conversion fails. +<p> If <em>ok</em> is not 0: if a conversion error occurs, <em>*ok</em> is set to +FALSE; otherwise <em>*ok</em> is set to TRUE. +<p> Leading and trailing whitespace is ignored by this function. +<p> For information on how string-to-number functions in QString handle +localized input, see <a href="#toDouble">toDouble</a>(). +<p> <p>See also <a href="#number">number</a>(). + +<h3 class=fn>short <a name="toShort"></a>QString::toShort ( bool * ok = 0, int base = 10 ) const +</h3> +Returns the string converted to a <tt>short</tt> using base <em>base</em>, which is 10 by default and must be between 2 and 36 or 0. If +<em>base</em> is 0, the base is determined automatically using the +following rules: +<ul> +<li>If the string begins with "0x", it is assumed to +be hexadecimal; +<li>If it begins with "0", it is assumed to be octal; +<li>Otherwise it is assumed to be decimal. +</ul> +<p> Returns 0 if the conversion fails. +<p> If <em>ok</em> is not 0: if a conversion error occurs, <em>*ok</em> is set to +FALSE; otherwise <em>*ok</em> is set to TRUE. +<p> Leading and trailing whitespace is ignored by this function. +<p> For information on how string-to-number functions in QString handle +localized input, see <a href="#toDouble">toDouble</a>(). +<p> <p>See also <a href="#number">number</a>(). + +<h3 class=fn>uint <a name="toUInt"></a>QString::toUInt ( bool * ok = 0, int base = 10 ) const +</h3> +Returns the string converted to an <tt>unsigned int</tt> using base <em>base</em>, which is 10 by default and must be between 2 and 36 or 0. If +<em>base</em> is 0, the base is determined automatically using the +following rules: +<ul> +<li>If the string begins with "0x", it is assumed to +be hexadecimal; +<li>If it begins with "0", it is assumed to be octal; +<li>Otherwise it is assumed to be decimal. +</ul> +<p> Returns 0 if the conversion fails. +<p> If <em>ok</em> is not 0: if a conversion error occurs, <em>*ok</em> is set to +FALSE; otherwise <em>*ok</em> is set to TRUE. +<p> Leading and trailing whitespace is ignored by this function. +<p> For information on how string-to-number functions in QString handle +localized input, see <a href="#toDouble">toDouble</a>(). +<p> <p>See also <a href="#number">number</a>(). + +<h3 class=fn>ulong <a name="toULong"></a>QString::toULong ( bool * ok = 0, int base = 10 ) const +</h3> +Returns the string converted to an <tt>unsigned long</tt> using base <em>base</em>, which is 10 by default and must be between 2 and 36 or 0. If +<em>base</em> is 0, the base is determined automatically using the +following rules: +<ul> +<li>If the string begins with "0x", it is assumed to +be hexadecimal; +<li>If it begins with "0", it is assumed to be octal; +<li>Otherwise it is assumed to be decimal. +</ul> +<p> Returns 0 if the conversion fails. +<p> If <em>ok</em> is not 0: if a conversion error occurs, <em>*ok</em> is set to +FALSE; otherwise <em>*ok</em> is set to TRUE. +<p> Leading and trailing whitespace is ignored by this function. +<p> For information on how string-to-number functions in QString handle +localized input, see <a href="#toDouble">toDouble</a>(). +<p> <p>See also <a href="#number">number</a>(). + +<h3 class=fn>Q_ULLONG <a name="toULongLong"></a>QString::toULongLong ( bool * ok = 0, int base = 10 ) const +</h3> +Returns the string converted to an <tt>unsigned long long</tt> using base <em>base</em>, which is 10 by default and must be between 2 and 36 or 0. If +<em>base</em> is 0, the base is determined automatically using the +following rules: +<ul> +<li>If the string begins with "0x", it is assumed to +be hexadecimal; +<li>If it begins with "0", it is assumed to be octal; +<li>Otherwise it is assumed to be decimal. +</ul> +<p> Returns 0 if the conversion fails. +<p> If <em>ok</em> is not 0: if a conversion error occurs, <em>*ok</em> is set to +FALSE; otherwise <em>*ok</em> is set to TRUE. +<p> Leading and trailing whitespace is ignored by this function. +<p> For information on how string-to-number functions in QString handle +localized input, see <a href="#toDouble">toDouble</a>(). +<p> <p>See also <a href="#number">number</a>(). + +<h3 class=fn>ushort <a name="toUShort"></a>QString::toUShort ( bool * ok = 0, int base = 10 ) const +</h3> +Returns the string converted to an <tt>unsigned short</tt> using base <em>base</em>, which is 10 by default and must be between 2 and 36 or 0. If +<em>base</em> is 0, the base is determined automatically using the +following rules: +<ul> +<li>If the string begins with "0x", it is assumed to +be hexadecimal; +<li>If it begins with "0", it is assumed to be octal; +<li>Otherwise it is assumed to be decimal. +</ul> +<p> Returns 0 if the conversion fails. +<p> If <em>ok</em> is not 0: if a conversion error occurs, <em>*ok</em> is set to +FALSE; otherwise <em>*ok</em> is set to TRUE. +<p> Leading and trailing whitespace is ignored by this function. +<p> For information on how string-to-number functions in QString handle +localized input, see <a href="#toDouble">toDouble</a>(). +<p> <p>See also <a href="#number">number</a>(). + +<h3 class=fn>void <a name="truncate"></a>QString::truncate ( uint newLen ) +</h3> +If <em>newLen</em> is less than the length of the string, then the +string is truncated at position <em>newLen</em>. Otherwise nothing +happens. +<p> <pre> + QString s = "truncate me"; + s.<a href="#truncate">truncate</a>( 5 ); // s == "trunc" + </pre> + +<p> <p>See also <a href="#setLength">setLength</a>(). + +<p>Example: <a href="mail-example.html#x718">network/mail/smtp.cpp</a>. +<h3 class=fn>const unsigned short * <a name="ucs2"></a>QString::ucs2 () const +</h3> +Returns the QString as a zero terminated array of unsigned shorts +if the string is not null; otherwise returns zero. +<p> The result remains valid so long as one unmodified +copy of the source string exists. + +<p>Example: <a href="activeqt-dotnet.html#x2467">dotnet/wrapper/lib/tools.cpp</a>. +<h3 class=fn>const <a href="qchar.html">QChar</a> * <a name="unicode"></a>QString::unicode () const +</h3> + +<p> Returns the Unicode representation of the string. The result +remains valid until the string is modified. + +<h3 class=fn><a href="qstring.html">QString</a> <a name="upper"></a>QString::upper () const +</h3> +Returns an uppercase copy of the string. +<p> <pre> + QString string( "TeXt" ); + str = string.<a href="#upper">upper</a>(); // t == "TEXT" + </pre> + +<p> <p>See also <a href="#lower">lower</a>(). + +<p>Examples: <a href="scribble-example.html#x942">scribble/scribble.cpp</a> and <a href="sql.html#x2240">sql/overview/custom1/main.cpp</a>. +<h3 class=fn><a href="qcstring.html">QCString</a> <a name="utf8"></a>QString::utf8 () const +</h3> +Returns the string encoded in UTF-8 format. +<p> See <a href="qtextcodec.html">QTextCodec</a> for more diverse coding/decoding of Unicode strings. +<p> <p>See also <a href="#fromUtf8">fromUtf8</a>(), <a href="#ascii">ascii</a>(), <a href="#latin1">latin1</a>(), and <a href="#local8Bit">local8Bit</a>(). + +<p>Example: <a href="archivesearch-example.html#x483">network/archivesearch/archivedialog.ui.h</a>. +<hr><h2>Related Functions</h2> +<h3 class=fn>bool <a name="operator!-eq"></a>operator!= ( const <a href="qstring.html">QString</a> & s1, const <a href="qstring.html">QString</a> & s2 ) +</h3> + +<p> +<p> Returns TRUE if <em>s1</em> is not equal to <em>s2</em>; otherwise returns FALSE. +Note that a null string is not equal to a not-null empty string. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) != 0. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>bool <a name="operator!-eq-2"></a>operator!= ( const <a href="qstring.html">QString</a> & s1, const char * s2 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns TRUE if <em>s1</em> is not equal to <em>s2</em>; otherwise returns FALSE. +Note that a null string is not equal to a not-null empty string. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) != 0. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>bool <a name="operator!-eq-3"></a>operator!= ( const char * s1, const <a href="qstring.html">QString</a> & s2 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns TRUE if <em>s1</em> is not equal to <em>s2</em>; otherwise returns FALSE. +Note that a null string is not equal to a not-null empty string. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) != 0. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>const <a href="qstring.html">QString</a> <a name="operator+"></a>operator+ ( const <a href="qstring.html">QString</a> & s1, const <a href="qstring.html">QString</a> & s2 ) +</h3> + +<p> +<p> Returns a string which is the result of concatenating the string +<em>s1</em> and the string <em>s2</em>. +<p> Equivalent to <em>s1</em>.<a href="#append">append</a>(<em>s2</em>). + +<h3 class=fn>const <a href="qstring.html">QString</a> <a name="operator+-2"></a>operator+ ( const <a href="qstring.html">QString</a> & s1, const char * s2 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns a string which is the result of concatenating the string +<em>s1</em> and character <em>s2</em>. +<p> Equivalent to <em>s1</em>.<a href="#append">append</a>(<em>s2</em>). + +<h3 class=fn>const <a href="qstring.html">QString</a> <a name="operator+-3"></a>operator+ ( const char * s1, const <a href="qstring.html">QString</a> & s2 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns a string which is the result of concatenating the +character <em>s1</em> and string <em>s2</em>. + +<h3 class=fn>const <a href="qstring.html">QString</a> <a name="operator+-4"></a>operator+ ( const <a href="qstring.html">QString</a> & s, char c ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns a string which is the result of concatenating the string +<em>s</em> and character <em>c</em>. +<p> Equivalent to <em>s</em>.<a href="#append">append</a>(<em>c</em>). + +<h3 class=fn>const <a href="qstring.html">QString</a> <a name="operator+-5"></a>operator+ ( char c, const <a href="qstring.html">QString</a> & s ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns a string which is the result of concatenating the +character <em>c</em> and string <em>s</em>. +<p> Equivalent to <em>s</em>.<a href="#prepend">prepend</a>(<em>c</em>). + +<h3 class=fn>bool <a name="operator-lt"></a>operator< ( const <a href="qstring.html">QString</a> & s1, const char * s2 ) +</h3> + +<p> +<p> Returns TRUE if <em>s1</em> is lexically less than <em>s2</em>; otherwise returns FALSE. +The comparison is case sensitive. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) < 0. + +<h3 class=fn>bool <a name="operator-lt-2"></a>operator< ( const char * s1, const <a href="qstring.html">QString</a> & s2 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns TRUE if <em>s1</em> is lexically less than <em>s2</em>; otherwise returns FALSE. +The comparison is case sensitive. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) < 0. + +<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="qdatastream.html">QDataStream</a> & s, const <a href="qstring.html">QString</a> & str ) +</h3> + +<p> Writes the string <em>str</em> to the stream <em>s</em>. +<p> See also <a href="datastreamformat.html">Format of the QDataStream operators</a> + +<h3 class=fn>bool <a name="operator-lt-eq"></a>operator<= ( const <a href="qstring.html">QString</a> & s1, const char * s2 ) +</h3> + +<p> +<p> Returns TRUE if <em>s1</em> is lexically less than or equal to <em>s2</em>; +otherwise returns FALSE. +The comparison is case sensitive. +Note that a null string is not equal to a not-null empty string. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>,<em>s2</em>) <= 0. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>bool <a name="operator-lt-eq-2"></a>operator<= ( const char * s1, const <a href="qstring.html">QString</a> & s2 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns TRUE if <em>s1</em> is lexically less than or equal to <em>s2</em>; +otherwise returns FALSE. +The comparison is case sensitive. +Note that a null string is not equal to a not-null empty string. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) <= 0. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>bool <a name="operator-eq-eq"></a>operator== ( const <a href="qstring.html">QString</a> & s1, const <a href="qstring.html">QString</a> & s2 ) +</h3> + +<p> +<p> Returns TRUE if <em>s1</em> is equal to <em>s2</em>; otherwise returns FALSE. +Note that a null string is not equal to a not-null empty string. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) == 0. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>bool <a name="operator-eq-eq-2"></a>operator== ( const <a href="qstring.html">QString</a> & s1, const char * s2 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns TRUE if <em>s1</em> is equal to <em>s2</em>; otherwise returns FALSE. +Note that a null string is not equal to a not-null empty string. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) == 0. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>bool <a name="operator-eq-eq-3"></a>operator== ( const char * s1, const <a href="qstring.html">QString</a> & s2 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns TRUE if <em>s1</em> is equal to <em>s2</em>; otherwise returns FALSE. +Note that a null string is not equal to a not-null empty string. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) == 0. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>bool <a name="operator-gt"></a>operator> ( const <a href="qstring.html">QString</a> & s1, const char * s2 ) +</h3> + +<p> +<p> Returns TRUE if <em>s1</em> is lexically greater than <em>s2</em>; otherwise +returns FALSE. +The comparison is case sensitive. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) > 0. + +<h3 class=fn>bool <a name="operator-gt-2"></a>operator> ( const char * s1, const <a href="qstring.html">QString</a> & s2 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns TRUE if <em>s1</em> is lexically greater than <em>s2</em>; otherwise +returns FALSE. +The comparison is case sensitive. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) > 0. + +<h3 class=fn>bool <a name="operator-gt-eq"></a>operator>= ( const <a href="qstring.html">QString</a> & s1, const char * s2 ) +</h3> + +<p> +<p> Returns TRUE if <em>s1</em> is lexically greater than or equal to <em>s2</em>; +otherwise returns FALSE. +The comparison is case sensitive. +Note that a null string is not equal to a not-null empty string. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) >= 0. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn>bool <a name="operator-gt-eq-2"></a>operator>= ( const char * s1, const <a href="qstring.html">QString</a> & s2 ) +</h3> + +<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> +<p> Returns TRUE if <em>s1</em> is lexically greater than or equal to <em>s2</em>; +otherwise returns FALSE. +The comparison is case sensitive. +Note that a null string is not equal to a not-null empty string. +<p> Equivalent to <a href="#compare">compare</a>(<em>s1</em>, <em>s2</em>) >= 0. +<p> <p>See also <a href="#isNull">isNull</a>() and <a href="#isEmpty">isEmpty</a>(). + +<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="qdatastream.html">QDataStream</a> & s, <a href="qstring.html">QString</a> & str ) +</h3> + +<p> Reads a string from the stream <em>s</em> into string <em>str</em>. +<p> See also <a href="datastreamformat.html">Format of the QDataStream operators</a> + +<!-- eof --> +<hr><p> +This file is part of the <a href="index.html">Qt toolkit</a>. +Copyright © 1995-2007 +<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |