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The +128-bit value of a UUID is generated by an algorithm that +guarantees that the value is unique. +<p> In Qt, UUIDs are wrapped by the QUuid struct which provides +convenience functions for handling UUIDs. Most platforms provide a +tool to generate new UUIDs, for example, uuidgen and guidgen. +<p> UUIDs generated by QUuid, are based on the <a href="#Version-enum">Random</a> version of the +<a href="#Variant-enum">DCE</a> (Distributed Computing Environment) standard. +<p> UUIDs can be constructed from numeric values or from strings, or +using the static <a href="#createUuid">createUuid</a>() function. They can be converted to a +string with <a href="#toString">toString</a>(). UUIDs have a <a href="#variant">variant</a>() and a <a href="#version">version</a>(), +and null UUIDs return TRUE from <a href="#isNull">isNull</a>(). + +<hr><h2>Member Type Documentation</h2> +<h3 class=fn><a name="Variant-enum"></a>QUuid::Variant</h3> + +<p> This enum defines the variant of the UUID, which is the scheme +which defines the layout of the 128-bits value. +<ul> +<li><tt>QUuid::VarUnknown</tt> - Variant is unknown +<li><tt>QUuid::NCS</tt> - Reserved for NCS (Network Computing System) backward compatibility +<li><tt>QUuid::DCE</tt> - Distributed Computing Environment, the scheme used by QUuid +<li><tt>QUuid::Microsoft</tt> - Reserved for Microsoft backward compatibility (GUID) +<li><tt>QUuid::Reserved</tt> - Reserved for future definition +</ul> +<h3 class=fn><a name="Version-enum"></a>QUuid::Version</h3> + +<p> This enum defines the version of the UUID. +<ul> +<li><tt>QUuid::VerUnknown</tt> - Version is unknown +<li><tt>QUuid::Time</tt> - Time-based, by using timestamp, clock sequence, and +MAC network card address (if available) for the node sections +<li><tt>QUuid::EmbeddedPOSIX</tt> - DCE Security version, with embedded POSIX UUIDs +<li><tt>QUuid::Name</tt> - Name-based, by using values from a name for all sections +<li><tt>QUuid::Random</tt> - Random-based, by using random numbers for all sections +</ul> +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="QUuid"></a>QUuid::QUuid () +</h3> + +<p> Creates the null UUID {00000000-0000-0000-0000-000000000000}. + +<h3 class=fn><a name="QUuid-2"></a>QUuid::QUuid ( uint l, ushort w1, ushort w2, uchar b1, uchar b2, uchar b3, uchar b4, uchar b5, uchar b6, uchar b7, uchar b8 ) +</h3> + +<p> Creates a UUID with the value specified by the parameters, <em>l</em>, +<em>w1</em>, <em>w2</em>, <em>b1</em>, <em>b2</em>, <em>b3</em>, <em>b4</em>, <em>b5</em>, <em>b6</em>, <em>b7</em>, <em>b8</em>. +<p> Example: +<pre> + // {67C8770B-44F1-410A-AB9A-F9B5446F13EE} + QUuid IID_MyInterface( 0x67c8770b, 0x44f1, 0x410a, 0xab, 0x9a, 0xf9, 0xb5, 0x44, 0x6f, 0x13, 0xee ) + </pre> + + +<h3 class=fn><a name="QUuid-3"></a>QUuid::QUuid ( const <a href="quuid.html">QUuid</a> & orig ) +</h3> + +<p> Creates a copy of the QUuid <em>orig</em>. + +<h3 class=fn><a name="QUuid-4"></a>QUuid::QUuid ( const <a href="qstring.html">QString</a> & text ) +</h3> +Creates a QUuid object from the string <em>text</em>. The function can +only convert a string in the format +{HHHHHHHH-HHHH-HHHH-HHHH-HHHHHHHHHHHH} (where 'H' stands for a hex +digit). If the conversion fails a null UUID is created. + +<h3 class=fn><a href="quuid.html">QUuid</a> <a name="createUuid"></a>QUuid::createUuid ()<tt> [static]</tt> +</h3> + +<p> Returns a new UUID of <a href="#Variant-enum">DCE</a> variant, and <a href="#Version-enum">Random</a> type. The +UUIDs generated are based on the platform specific pseudo-random +generator, which is usually not a cryptographic-quality random +number generator. Therefore, a UUID is not guaranteed to be unique +cross application instances. +<p> On Windows, the new UUID is extremely likely to be unique on the +same or any other system, networked or not. +<p> <p>See also <a href="#variant">variant</a>() and <a href="#version">version</a>(). + +<h3 class=fn>bool <a name="isNull"></a>QUuid::isNull () const +</h3> +Returns TRUE if this is the null UUID +{00000000-0000-0000-0000-000000000000}; otherwise returns FALSE. + +<h3 class=fn><a name="operator-QString"></a>QUuid::operator QString () const +</h3> + +<p> Returns the string representation of the uuid. +<p> <p>See also <a href="#toString">toString</a>(). + +<h3 class=fn>bool <a name="operator!-eq"></a>QUuid::operator!= ( const <a href="quuid.html">QUuid</a> & other ) const +</h3> + +<p> Returns TRUE if this QUuid and the <em>other</em> QUuid are different; +otherwise returns FALSE. + +<h3 class=fn>bool <a name="operator-lt"></a>QUuid::operator< ( const <a href="quuid.html">QUuid</a> & other ) const +</h3> + +<p> Returns TRUE if this QUuid is of the same variant, +and lexicographically before the <em>other</em> QUuid; +otherwise returns FALSE. +<p> <p>See also <a href="#variant">variant</a>(). + +<h3 class=fn><a href="quuid.html">QUuid</a> & <a name="operator-eq"></a>QUuid::operator= ( const <a href="quuid.html">QUuid</a> & uuid ) +</h3> + +<p> Assigns the value of <em>uuid</em> to this QUuid object. + +<h3 class=fn>bool <a name="operator-eq-eq"></a>QUuid::operator== ( const <a href="quuid.html">QUuid</a> & other ) const +</h3> + +<p> Returns TRUE if this QUuid and the <em>other</em> QUuid are identical; +otherwise returns FALSE. + +<h3 class=fn>bool <a name="operator-gt"></a>QUuid::operator> ( const <a href="quuid.html">QUuid</a> & other ) const +</h3> + +<p> Returns TRUE if this QUuid is of the same variant, +and lexicographically after the <em>other</em> QUuid; +otherwise returns FALSE. +<p> <p>See also <a href="#variant">variant</a>(). + +<h3 class=fn><a href="qstring.html">QString</a> <a name="toString"></a>QUuid::toString () const +</h3> +<a href="qstring.html">QString</a> <a href="#toString">QUuid::toString</a>() const +<p> Returns the string representation of the uuid. + +<h3 class=fn><a href="quuid.html#Variant-enum">QUuid::Variant</a> <a name="variant"></a>QUuid::variant () const +</h3> + +<p> Returns the variant of the UUID. +The null UUID is considered to be of an unknown variant. +<p> <p>See also <a href="#version">version</a>(). + +<h3 class=fn><a href="quuid.html#Version-enum">QUuid::Version</a> <a name="version"></a>QUuid::version () const +</h3> + +<p> Returns the version of the UUID, if the UUID is of the DCE +variant; otherwise returns VerUnknown. +<p> <p>See also <a href="#variant">variant</a>(). + +<hr><h2>Related Functions</h2> +<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="quuid.html">QUuid</a> & id ) +</h3> + +Writes the uuid <em>id</em> to the datastream <em>s</em>. + +<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="quuid.html">QUuid</a> & id ) +</h3> + +Reads uuid from from the stream <em>s</em> into <em>id</em>. + +<!-- 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>. 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