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authorMichele Calgaro <michele.calgaro@yahoo.it>2018-10-21 19:05:32 +0900
committerMichele Calgaro <michele.calgaro@yahoo.it>2018-10-21 19:05:32 +0900
commit23b535df5bc08e8f5e98270859c5dc5c73f4ebdd (patch)
tree0bb79edeb79d219b3c55958f57e808ce088a6b09 /doc/html/porting2.html
parentc048ce6e8cc109b317293d380a5053e19a37dd31 (diff)
downloadtqt3-23b535df5bc08e8f5e98270859c5dc5c73f4ebdd.tar.gz
tqt3-23b535df5bc08e8f5e98270859c5dc5c73f4ebdd.zip
Removed some obsolete code related to Qt1.
Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
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- | <a href="classes.html">
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-</td>
-<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Porting to TQt 2.x</h1>
-
-
-
-<p> <p>
-You're probably looking at this page because you want to port
-your application from TQt 1.x to TQt 2.x, but to be sure, let's
-review the good reasons to do this:
-<ul>
-<li>To get access to all the new TQt 2.x features like the rich text
-HTML subset for formatted labels, tooltips, online help etc.
-and the much easier to use layout classes and widgets.
-<li>To make your application truly international, with support
-for Unicode and translations for the languages of the world.
-<li>To allow your application to fit into the new look of the
-Unix desktop with configurable, very powerful "themes". The
-extended style system also integrates TQt applications better
-on MS-Windows desktops. TQt will automatically chose the right
-colors and fonts and obey global system setting changes.
-<li>To stay up-to-date with the version of TQt that gets all the
-new features and bug-fixes.
-<li>To get more speed and smoother widgets display with all the
-new anti-flicker changes in TQt.
-<li>Most of all though, you want to port to TQt 2.x
-so that your Wheel Mouse works!
-</ul>
-<p> <p>
-The TQt 2.x series is not binary compatible with the 1.x series.
-This means programs compiled for TQt 1.x must be recompiled to work
-with TQt 2.x. TQt 2.x is also not completely <em>source</em> compatible
-with 1.x, however all points of incompatibility cause
-compiler errors (rather than mysterious results), or produce run-time
-messages. The result is that TQt 2.x includes many additional features,
-discards obsolete functionality that is easily converted to use the new
-features, and that porting an application from TQt 1.x to TQt 2.x is
-a simple task well worth the amount of effort required.
-<p> To port code using TQt 1.x to use TQt 2.x:
-<p> <ul>
-<li> Briefly read the porting notes below to get an idea of what to expect.
-<li> Be sure your code compiles and runs well on all your target platforms with TQt 1.x.
-<li> Recompile with TQt 2.x. For each error, search below for related
-identifiers (eg. function names, class names) - this documented is
-structured to mention all relevant identifiers to facilitate such
-searching, even if that makes it a little verbose.
-<li> If you get stuck, ask on the qt-interest mailing list, or
-Trolltech Technical Support if you're a Professional Edition
-licensee.
-</ul>
-<p> Many very major projects, such as <a href="http://www.kde.org/">KDE</a>
-have been port, so there is plenty of expertise in the collective conscious
-that is the TQt Developer Community!
-</p>
-<p> <hr>
-<p> <h2 align=center>The Porting Notes</h2>
-<p> <ul>
-<li><b><a href="#Namespace">Namespace</a></b>
-<li><b><a href="#Virtual">Virtual Functions</a></b>
-<li><b><a href="#Collection">Collection classes</a></b>
-<li><b><a href="#DefaultParent">No Default 0 Parent Widget</a></b>
-<li><b><a href="#DebugVsRelease">Debug vs. Release</a></b>
-<li><b><a href="#TQApplication">TQApplication</a></b>
-<li><b><a href="#TQClipboard">TQClipboard</a></b>
-<li><b><a href="#TQColor">TQColor</a></b>
-<li><b><a href="#TQDataStream">TQDataStream</a></b>
-<li><b><a href="#TQDialog">TQDialog</a></b>
-<li><b><a href="#TQDropSite">TQDropSite</a></b>
-<li><b><a href="#TQEvent">TQEvent</a></b>
-<li><b><a href="#TQFile">TQFile</a></b>
-<li><b><a href="#TQFontMetrics">TQFontMetrics</a></b>
-<li><b><a href="#TQIODevice">TQIODevice</a></b>
-<li><b><a href="#TQLabel">TQLabel</a></b>
-<li><b><a href="#TQLayout">TQLayout</a></b>
-<li><b><a href="#TQListView">TQListView</a></b>
-<li><b><a href="#TQMenuData">TQMenuData</a></b>
-<li><b><a href="#TQMenuData">TQPopupMenu</a></b>
-<li><b><a href="#TQMultiLineEdit">TQMultiLineEdit</a></b>
-<li><b><a href="#TQPainter">TQPainter</a></b>
-<li><b><a href="#TQPicture">TQPicture</a></b>
-<li><b><a href="#TQPoint">TQPoint, <a href="ntqpointarray.html">TQPointArray</a>, <a href="ntqsize.html">TQSize</a> and <a href="ntqrect.html">TQRect</a></a></b>
-<li><b><a href="#TQPixmap">TQPixmap</a></b>
-<li><b><a href="#TQRgb">TQRgb</a></b>
-<li><b><a href="#TQScrollView">TQScrollView</a></b>
-<li><b><a href="#TQStrList">TQStrList</a></b>
-<li><b><a href="#TQString">TQString</a></b>
-<li><b><a href="#TQTextStream">TQTextStream</a></b>
-<li><b><a href="#TQUriDrag">TQUriDrag / TQUrlDrag</a></b>
-<li><b><a href="#TQValidator">TQComboBox</a></b>
-<li><b><a href="#TQValidator">TQLineEdit</a></b>
-<li><b><a href="#TQValidator">TQSpinBox</a></b>
-<li><b><a href="#TQValidator">TQValidator</a></b>
-<li><b><a href="#TQWidget">TQWidget</a></b>
-<li><b><a href="#TQWindow">TQWindow</a></b>
-</ul>
-<p> <hr>
-<p> <h3><a name="Namespace">Namespace</a></h3>
-<p> <p> TQt 2.x is namespace-clean, unlike 1.x. TQt now uses very few
-global identifiers. Identifiers like <code>red, blue, LeftButton,
-AlignRight, Key_Up, Key_Down, NoBrush</code> etc. are now part of a
-special class <code>TQt</code> (defined in ntqnamespace.h),
-which is inherited by
-most TQt classes. Member functions of classes that inherit from <a href="ntqwidget.html">TQWidget</a>,
-etc. are totally unaffected, but code that is
-<em>not</em> in functions of classes inherited from <code>TQt</code>,
-you must qualify these identifiers like this: <code>TQt::red,
-TQt::LeftButton, TQt::AlignRight</code>, etc.
-<p> <p>The <code>qt/bin/tqt20fix</code> script helps to fix the code that
-needs adaption, though most code does not need changing.
-<p> Compiling with -DQT1COMPATIBILITY will help you get going with TQt 2.x
-- it allows all the old "dirty namespace" identifiers from TQt 1.x to
-continue working. Without it, you'll get compile errors that can
-easily be fixed by searching this page for the clean identifiers.
-<p> <h3><a name="DefaultParent">No Default 0 Parent Widget</a></h3>
-<p> In TQt 1.x, all widget constructors were defined with a default value
-of 0 for the parent widget. However, only the main window of the
-application should be created with a 0 parent, all other widgets
-should have parents. Having the 0 default made it too simple to create
-bugs by forgetting to specify the parent of non-mainwindow
-widgets. Such widgets would typically never be deleted (causing memory
-leaks), and they would become top-level widgets, confusing the window
-managers. Therefore, in TQt 2.x the 0 default parent has been removed
-for the widget classes that are not likely to be used as main windows.
-<p> Note also that programs no longer need (or should) use 0 parent just
-to indicate that a widget should be top-level. See
-<pre> TQWidget::isTopLevel() </pre>
- for details. See also the notes about
-<a href="#TQMenuData">TQPopupMenu</a> and <a href="#TQDialog">TQDialog</a>
-below.
-<p> <h3><a name="Virtual">Virtual Functions</a></h3>
-<p> <p> Some virtual functions have changed signature in TQt 2.x.
-If you override them in derived classes, you must change the signature
-of your functions accordingly.
-<p> <!-- warwick can check for additions to this with his qt-2-report -->
-<ul>
-<li><pre> TQWidget::setStyle(GUIStyle)</pre>
-
-<li><pre> TQListView::addColumn(const char *, int)</pre>
-
-<li><pre> TQListView::setColumnText(int, const char *)</pre>
-
-<li><pre> TQListViewItem::setText(int, const char *)</pre>
-
-<li><pre> TQMultiLineEdit::insertLine(const char *, int)</pre>
-
-<li><pre> TQMultiLineEdit::insertAt(const char *, int, int, bool)</pre>
-
-<li><pre> TQSpinBox::setPrefix(const char *)</pre>
-
-<li><pre> TQSpinBox::setSuffix(const char *)</pre>
-
-<li><pre> TQToolButton::setTextLabel(const char *, bool)</pre>
-
-<li><pre> TQDoubleValidator::validate(TQString &amp;, int &amp;)</pre>
-
-<li><pre> TQIntValidator::validate(TQString &amp;, int &amp;)</pre>
-
-<li><pre> TQValidator::fixup(TQString &amp;)</pre>
-
-<li><pre> TQSlider::paintSlider(TQPainter *, const <a href="ntqrect.html">TQRect</a> &amp;)</pre>
-
-</ul>
-<p> This is one class of changes that are
-not detected by the compiler,
-so you should mechanically search for each of
-these function names in your header files, eg.
-<p> <pre>
-egrep -w 'setStyle|addColumn|setColumnText|setText...' *.h
-</pre>
-
-<p> Of course, you'll get a few false positives (eg. if you have a setText
-function that is not in a subclass of <a href="qlistviewitem.html">TQListViewItem</a>).
-<p> <h3><a name="Collection">Collection classes</a></h3>
-<p> <p> The <a href="collection.html#collection-classes">collection classes</a> include generic
-classes such as TQGDict, TQGList, and
-the subclasses such as <a href="ntqdict.html">TQDict</a> and TQPtrList.
-<p> <p> The macro-based TQt collection classes are obsolete; use the
-template-based classes instead. Simply remove includes of ntqgeneric.h and
-replace e.g. Q_DECLARE(<a href="ntqcache.html">TQCache</a>,TQPixmap) with TQCache<TQPixmap>.
-<p> <p> The GCI global typedef is replaced by TQCollection::Item. Only if you
-make your own subclasses of the undocumented generic collection classes
-will you have GCI in your code.
-This change has been made to avoid collisions with other namespaces.
-<p> <p> The GCF global typedef is removed (it was not used in TQt).
-<p> <h3><a name="DebugVsRelease">Debug vs. Release</a></h3>
-<p> <p>The Q_ASSERT macro is now a null expression if the QT_CHECK_STATE flag
-is not set (i.e. if the TQT_NO_CHECK flag is defined).
-<p> <p>The debug() function now outputs nothing if TQt was compiled with
-the TQT_NO_DEBUG macro defined.
-<p> <h3><a name="TQString">TQString</a></h3>
-<p> <a href="ntqstring.html">TQString</a> has undergone major changes internally, and although it is highly
-backward compatible, it is worth studying in detail when porting to TQt 2.x.
-The TQt 1.x TQString class has been renamed to <a href="ntqcstring.html">TQCString</a> in TQt 2.x, though if
-you use that you will incur a performance penalty since all TQt functions
-that took const char* now take const TQString&.
-<p> <p>
-To take full advantage of the new <a href="i18n.html#internationalization">Internationalization</a>
-functionality in TQt 2.x, the following steps are required:
-<p> <ul>
-<li> Start converting all uses of "const char*" in parameters to
-"const TQString&" - this can often be done mechanically, eg.
-using Perl. Convert usage of char[] for temporary string
-building to TQString (much software already uses TQString for
-this purpose as it offers many more facilities).
-<p> If you find that you are mixing usage of TQCString, TQString,
-and <a href="qbytearray.html">TQByteArray</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 NUL-terminated
-8-bit data, use TQCString; if it is unterminated (ie.
-contains NULs) 8-bit data, use TQByteArray; if it is text,
-use <a href="ntqstring.html">TQString</a>.
-</p>
-<li> Put a breakpoint in <pre> TQString::latin1()</pre>
-
-to catch places where
-Unicode information is being converted to ASCII (loosing
-information if your user in not using Latin1). TQt has
-a small number of calls to this - ignore those. As a stricter
-alternative, compile your code with TQT_NO_ASCII_CAST defined,
-which hides the automatic conversion of TQString to const char*,
-so you can catch problems at compile time.
-</p>
-<li> See the TQt <a href="i18n.html">Internationalization page</a>
-for information about the full process of internationalizing
-your software.
-</ul>
-<p> <p>
-Points to note about the new TQString are:
-<p> <dl compact>
-<dt><b>Unicode</b></dt>
-<dd>
-TQt now uses Unicode throughout.
-data() now returns a <em>const</em> reference to an ASCII version
-of the string - you cannot directly access the
-string as an array of bytes, because it isn't one. Often, latin1() is
-what you want rather than data(), or just leave it to convert to
-const char* automatically. data() is only used now to aide porting to TQt 2.x,
-and ideally you'll only need latin1() or implicit conversion when interfacing
-to facilities that do not have Unicode support.
-<p> <dt><b>Automatic-expanding</b></dt>
-<dd>
-A big advantage of the new <a href="ntqstring.html">TQString</a> is that it automatically expands
-when you write to an indexed position.
-<p> <dt><b>TQChar and <a href="qcharref.html">TQCharRef</a></b></dt>
-<dd>
-<a href="qchar.html">TQChar</a> are the Unicode characters that make up a TQString. A TQCharRef is
-a temporary reference to a TQChar in a TQString that when assigned to
-ensures that the <a href="shclass.html#implicit-sharing">implicit sharing</a> semantics of the TQString are maintained.
-You are unlikely to use TQCharRef in your own code - but so that you
-understand compiler error messages, just know that <tt>mystring[123]</tt>
-is a TQCharRef whenever <tt>mystring</tt> is not a constant string. A TQCharRef
-has basically the same functionality as a TQChar, except it is more restricted
-in what you can assign to it and cast it to (to avoid programming errors).
-<p> <dt><b>Use TQString</b></dt>
-<dd>
-Try to always use TQString. If you <em>must</em>, use <a href="ntqcstring.html">TQCString</a> which is the
-old implementation from TQt 1.x.
-<p> <dt><b>Unicode vs. ASCII</b></dt>
-<dd>
-Every conversion to and from ASCII is wasted time, so try to use <a href="ntqstring.html">TQString</a>
-as much as possible rather than const char*. This also ensures you have
-full 16-bit support.
-<p> <dt><b>Convertion to ASCII</b></dt>
-<dd>
-The return value from operator const char*() is transient - don't expect
-it to remain valid while you make deep function calls.
-It is valid for as long as you don't modify or destroy the TQString.
-<p> <dt><b>TQString is simpler</b></dt>
-<dd>
-Expect your code to become simpler with the new TQString, especially
-places where you have used a char* to wander over the string rather
-than using indexes into the string.
-<p> <dt><b>Some hacks don't work</b></dt>
-<dd>
-This hack:
-use_sub_string( &my_string[index] )
-should be replaced by:
-use_sub_string( my_string.mid(index) )
-<p> <dt><b>TQString(const char*, int) is removed</b></dt>
-<dd>
-The TQString constructor taking a const char* and an integer is removed.
-Use of this constructor was error-prone, since the length included the
-'&#92;0' terminator. Use <a href="ntqstring.html#left">TQString::left</a>(int) or <a href="ntqstring.html#fromLatin1">TQString::fromLatin1</a>( const char*,
-int ) -- in both cases the int parameter signifies the number of characters.
-<p> <dt><b>TQString(int) is private</b></dt>
-<dd>
-The <a href="ntqstring.html">TQString</a> constructor taking an integer is now private. This function
-is not meaningful anymore, since TQString does all space allocation
-automatically. 99% of cases can simple be changed to use the
-default constructor, TQString().
-<p>
-In TQt 1.x the constructor was used in two ways: accidentally,
-by attempting to convert a char to a TQString (the char converts to int!) -
-giving strange bugs, and as a way to make a TQString big enough prior to
-calling <pre> TQString::sprintf()</pre>
- . In TQt 2.x, the accidental bug case is
-prevented (you will get a compilation error) and TQString::sprintf has
-been made safe - you no longer need to pre-allocate space (though for
-other reasons, sprintf is still a poor choice - eg. it doesn't pass Unicode).
-The only remaining common case is conversion of 0 (NULL) to TQString, which
-would usually give expected results in TQt 1.x. For TQt 2.x the correct
-syntax is to use <a href="ntqstring.html#TQString-null">TQString::null</a>, though note that
-the default constructor, TQString(), creates a null string too.
-Assignment of 0 to a <a href="ntqstring.html">TQString</a> is ambiguous - assign
-TQString::null; you'll mainly find these in code that has been converted
-from const char* types to TQString.
-This also prevents a common error case from TQt 1.x - in
-that version, mystr = 'X' would <em>not</em> produce the expected
-results and was always a programming error; in TQt 2.x, it works - making
-a single-character string.
-<p> <p>
-Also see <a href="#TQStrList">TQStrList</a>.
-<p> <dt><b>Signals and Slots</b></dt>
-<dd>
-Many signal/slots have changed from const char* to TQString. You will
-get run-time errors when you try to <pre> TQObject::connect()</pre>
-
-to the old
-signals and slots, usually with a message indicating the const TQString&
-replacement signal/slot.
-<p> <dt><b>Optimize with Q2HELPER</b></dt>
-<dd>
-In qt/src/tools/qstring.cpp there is a Q2HELPER - define it for some
-extra debugging/optimizing features (don't leave it it - it kills performance).
-You'll get an extra function, qt_qstring_stats(), which will print a
-summary of how much your application is doing Unicode and ASCII
-back-and-forth conversions.
-<p> <dt><b>TQString::detach() is obsolete and removed</b></dt>
-<dd>
-Since <a href="ntqstring.html">TQString</a> is now always shared, this function does nothing.
-Remove calls to TQString::detach().
-<p> <dt><b>TQString::resize(int size) is obsolete and removed</b></dt>
-<dd>
-Code using this to truncate a string should use
-<a href="ntqstring.html#truncate">truncate(size-1)</a>.
-Code using qstr.resize(0) should use qstr = TQString::null.
-Code calling resize(n) prior to using
-<a href="ntqstring.html#operator[]">operator[]</a> up to n just remove
-the resize(n) completely.
-<p> <dt><b>TQString::size() is obsolete and removed</b></dt>
-<dd>
-Calls to this function must be replaced by
-<a href="ntqstring.html#length">length()</a>+1.
-<p> <dt><b>TQString::setStr(const char*) is removed</b></dt>
-<dd>Try to understand why you were using this.
-If you just meant assignment, use that. Otherwise,
-you are probably using TQString as an array of bytes, in which case use
-<a href="qbytearray.html">TQByteArray</a> or <a href="ntqcstring.html">TQCString</a> instead.
-<p> <dt><b>TQString is not an array of bytes</b></dt>
-<dd>
-Code that uses <a href="ntqstring.html">TQString</a> as an array of bytes should use TQByteArray
-or a char[], <em>then</em> convert that to a TQString if needed.
-<p> <dt><b>"string = 0"</b></dt>
-<dd>
-Assigning 0 to a TQString should be assigning the null string,
-ie. string = TQString::null.
-<p> <dt><b>System functions</b></dt>
-<dd>
-You may find yourself needing latin1() for passing to the operating system
-or other libraries, and be tempted to use TQCString to save the conversion,
-but you are better off using Unicode throughout, then when the operating
-system supports Unicode, you'll be prepared. Some Unix operating systems
-are now beginning to have basic Unicode support, and TQt will be tracking
-these improvements as they become more widespread.
-<p> <dt><b>Bugs removed</b></dt>
-<dd>
-toShort() returns 0 (and sets *ok to false) on error.
-toUInt() now works for big valid unsigned integers.
-insert() now works into the same string.
-<p> <dt><b>NULL pointers</b></dt>
-<dd>
-When converting "const char*" usage to TQString in order to make your
-application fully Unicode-aware, use TQString::null for the null value
-where you would have used 0 with char pointers.
-<p> <dt><b>TQString is not null terminated</b></dt>
-<dd>
-This means that inserting a 0-character
-in the middle of the string does <em>not</em> change the length(). ie.
-<pre>
- <a href="ntqstring.html">TQString</a> s = "fred";
- s[1] = '\0';
- // s.<a href="ntqstring.html#length">length</a>() == 4
- // s == "f\0ed"
- // s.<a href="ntqstring.html#latin1">latin1</a>() == "f"
- s[1] = 'r';
- // s == "fred"
- // s.<a href="ntqstring.html#latin1">latin1</a>() == "fred"
- </pre>
-
-Especially look out for this type of code:
-<pre>
- <a href="ntqstring.html">TQString</a> s(2);
- s[0] = '?';
- s[1] = 0;
- </pre>
-
-This creates a string 2 characters long.
-To find these problems while converting, you might like to
-add <a href="ntqapplication.html#Q_ASSERT">Q_ASSERT</a>(strlen(d->ascii)==d->len) inside
-<pre> TQString::latin1()</pre>
- .
-<p> <dt><b>TQString or Standard C++ string?</b></dt>
-<dd>
-<p>
-The Standard C++ Library string is not Unicode. Nor is wstring defined
-to be so (for the small number of platforms where it is defined at all).
-This is the same mistake made over and over
-in the history of C - only when non-8-bit characters are <em>the norm</em>
-do programmers find them usable. Though it is possible to convert between
-string and <a href="ntqstring.html">TQString</a>, it is less efficient than using TQString throughout.
-For example, when using:
-<pre>
- TQLabel::<a href="ntqlabel.html#setText">setText</a>( const <a href="ntqstring.html">TQString</a>&amp; )
-</pre>
-
-if you use string, like this:
-<pre>
- void myclass::dostuffwithtext( const string&amp; str )
- {
- mylabel.setText( TQString(str.c_str()) );
- }
-</pre>
-
-that will create a (ASCII only) copy of str, stored in mylabel.
-But this:
-<pre>
- void myclass::dostuffwithtext( const <a href="ntqstring.html">TQString</a>&amp; str )
- {
- mylabel.setText( str );
- }
-</pre>
-
-will make an <a href="shclass.html#implicitly-shared">implicitly shared</a> reference to str in the <a href="ntqlabel.html">TQLabel</a> - no copying
-at all. This function might be 10 nested function calls away from something
-like this:
-<pre>
- void toplevelclass::initializationstuff()
- {
- doStuff( tr("Okay") );
- }
-</pre>
-
-At this point, in TQt 2.x, the tr() does a very fast dictionary lookup
-through memory-mapped message files, returning some Unicode <a href="ntqstring.html">TQString</a> for
-the appropriate language (the default being to just make a TQString out
-of the text, of course - you're not <em>forced</em> to use any of these
-features), and that <em>same</em> memory mapped Unicode will be passed
-though the system. All occurrences of the translation of "Okay" can
-potentially be shared.
-<p> </dl>
-<p> <h3><a name="TQApplication">TQApplication</a></h3>
-<p> In the function <pre> TQApplication::setColorSpec()</pre>
- ,
-PrivateColor and TrueColor are obsolete. Use ManyColor instead.
-<p> <h3><a name="TQColor">TQColor</a></h3>
-<p> <p>
-All colors
-(color0,
-color1,
-black,
-white,
-darkGray,
-gray,
-lightGray,
-red,
-green,
-blue,
-cyan,
-magenta,
-yellow,
-darkRed,
-darkGreen,
-darkBlue,
-darkCyan,
-darkMagenta,
-and
-darkYellow)
-are in the TQt namespace.
-In members of classes that inherit the TQt namespace-class (eg. <a href="ntqwidget.html">TQWidget</a>
-subclasses), you can use the unqualified names as before, but in global
-functions (eg. main()), you need to qualify them: TQt::red, TQt::white, etc.
-See also the <a href="#TQRgb">TQRgb</a> section below.
-<p> <h3><a name="TQRgb">TQRgb</a></h3>
-<p> In TQRgb (a typedef of long), the order of the RGB channels has changed to
-be in the more efficient order (for typical contemporary hardware). If your
-code made assumptions about the order, you will get blue where you expect
-red and vice versa (you'll not notice the problem if you use shades of
-gray, green, or magenta). You should port your code to use the
-creator function <a href="ntqcolor.html#qRgb">tqRgb</a>(int r,int g,int b) and the
-access functions <a href="ntqcolor.html#qRed">tqRed</a>(TQRgb), <a href="ntqcolor.html#qBlue">tqBlue</a>(TQRgb), and <a href="ntqcolor.html#qGreen">tqGreen</a>(TQRgb).
-If you are using the alpha channel, it hasn't moved, but you should use
-the functions <a href="ntqcolor.html#qRgba">tqRgba</a>(int,int,int,int) and <a href="ntqcolor.html#qAlpha">tqAlpha</a>(TQRgb). Note also that
-<a href="ntqcolor.html#pixel">TQColor::pixel</a>() does <i>not</i> return a TQRgb (it never did on all platforms,
-but your code may have assumed so on your platform) - this may also produce
-strange color results - use <a href="ntqcolor.html#rgb">TQColor::rgb</a>() if you want a TQRgb.
-<p> <h3><a name="TQDataStream">TQDataStream</a></h3>
-<p> <p>The TQDatastream serialization format of most TQt classes is changed
-in TQt 2.x. Use <pre> TQDataStream::setVersion( 1 )</pre>
- to get a
-datastream object that can read and write TQt 1.x format data streams.
-<p> <p>If you want to write TQt 1.x format datastreams, note the following
-compatibility issues:
-<ul>
-<li>TQString: TQt 1.x has no Unicode support, so strings will be
-serialized by writing the classic C string returned by <pre>
- TQString::<a href="ntqstring.html#latin1">latin1</a>().</pre>
-
-<li><a href="#TQPoint">TQPoint & al.</a>: Coordinates will be
-truncated to the TQt 1.x 16 bit format.
-</ul>
-<p> <h3><a name="TQWidget">TQWidget</a></h3>
-<p> <h4>TQWidget::recreate()</h4>
-<p>
-This function is now called <a href="ntqwidget.html#reparent">reparent()</a>.
-<p> <h4>TQWidget::setAcceptFocus(bool)</h4>
-<p>
-This function is removed.
-Calls like TQWidget::setAcceptFocus(TRUE) should be replaced by
-<pre> TQWidget::setFocusPolicy(StrongFocus)</pre>
- , and
-calls like TQWidget::setAcceptFocus(FALSE) should be replaced by
-<pre> TQWidget::setFocusPolicy(NoFocus)</pre>
- .
-Additional policies are TabFocus and ClickFocus.
-<p> <h4>TQWidget::paintEvent()</h4>
-<p>
-paintEvent(0) is not permitted - subclasses need not check for
-a null event, and might crash.
-Never pass 0 as the argument to paintEvent(). You probably
-just want repaint() or update() instead.
-<p>
-When processing a paintEvent, painting is only permitted within
-the update region specified in the event. Any painting outside will be
-clipped away. This shouldn't break any code (it was always like this
-on MS-Windows) but makes many explicit calls to
-<a href="ntqpainter.html#setClipRegion">TQPainter::setClipRegion</a>() superfluous. Apart from the improved
-consistency, the change is likely to reduce flicker and to make TQt
-event slightly faster.
-<p> <h3><a name="TQIODevice">TQIODevice</a></h3>
-<p>
-The protected member TQIODevice::index is renamed to TQIODevice::ioIndex
-to avoid warnings and to allow compilation with bad C libraries that
-#define index to strchr. If you have made a subclass of <a href="ntqiodevice.html">TQIODevice</a>,
-check every occurrence of the string "index" in the implementation, since
-a compiler will not always catch cases like <pre>(uint)index</pre>
-
-that need to be changed.
-<p> <h3><a name="TQLabel">TQLabel</a></h3>
-<p> <h4><pre> TQLabel::setMargin()</pre>
- </h4>
-<p>
-<pre> TQLabel::setMargin()</pre>
- and<pre> TQLabel::margin()</pre>
-
-have been renamed to <pre> TQLabel::setIndent()</pre>
- and
-<pre> TQLabel::indent()</pre>
- , respectively. This was done to avoid
-collision with <a href="ntqframe.html#setMargin">TQFrame::setMargin</a>(), which is now virtual.
-<p> <h4><pre> TQLabel::setMovie()</pre>
- </h4>
-<p>
-Previously, setting a movie on a label cleared the value of text().
-Now it doesn't. If you somehow used <tt>TQLabel::text()</tt>
-to detect if a
-movie was set, you might have trouble. This is unlikely.
-<p> <h3><a name="TQDialog">TQDialog</a></h3>
-<p> <p> The semantics of the parent pointer changed for modeless dialogs:
-In TQt-2.x, dialogs are always top level windows. The parent, however,
-takes the ownership of the dialog, i.e. it will delete the dialog at
-destruction if it has not been explicitly deleted
-already. Furthermore, the window system will be able to tell that both
-the dialog and the parent belong together. Some X11 window managers
-will for instance provide a common taskbar entry in that case.
-<p> <p>
-If the dialog belongs to a top level main window
-of your application, pass this main window as parent to the dialog's
-constructor. Old code (with 0 pointer) will still run. Old code that
-included TQDialogs as child widgets will no longer work (it never really did).
-If you think you might be doing this, put a breakpoint in
-<a href="ntqdialog.html#TQDialog">TQDialog::TQDialog</a>() conditional on parent not being 0.
-<p> <h3><a name="TQStrList">TQStrList</a></h3>
-<p> Many methods that took a <a href="ntqstrlist.html">TQStrList</a> can now instead take a <a href="ntqstringlist.html">TQStringList</a>,
-which is a real list of <a href="ntqstring.html">TQString</a> values.
-<p> To use TQStringList rather than TQStrList, change loops that look like this:
-<pre>
- <a href="ntqstrlist.html">TQStrList</a> list = ...;
- const char* s;
- for ( s = list.<a href="ntqptrlist.html#first">first</a>(); s; s = list.<a href="ntqptrlist.html#next">next</a>() ) {
- process(s);
- }
-</pre>
-
-to be like this:
-<pre>
- <a href="ntqstringlist.html">TQStringList</a> list = ...;
- TQStringList::ConstIterator i;
- for ( i = list.<a href="ntqvaluelist.html#begin">begin</a>(); i != list.<a href="ntqvaluelist.html#end">end</a>(); ++i ) {
- process(*i);
- }
-</pre>
-
-<p> In general, the TQStrList functions are less efficient, building a temporary TQStringList.
-<p> The following functions now use TQStringList rather than TQStrList
-for return types/parameters.
-<p> <ul>
-<li><tt>void <a href="ntqfiledialog.html#setFilters">TQFileDialog::setFilters</a>(const <a href="ntqstrlist.html">TQStrList</a>&)</tt>
-becomes <tt>void TQFileDialog::setFilters(const <a href="ntqstringlist.html">TQStringList</a>&)</tt>
-<li><tt>TQStrList <a href="ntqfiledialog.html#getOpenFileNames">TQFileDialog::getOpenFileNames</a>(...)</tt>
-becomes <tt>TQStringList TQFileDialog::getOpenFileNames(...)</tt>
-<li><tt>bool TQUrlDrag::decodeLocalFiles(<a href="qmimesource.html">TQMimeSource</a>*, TQStrList&)</tt>
-becomes <tt>bool <a href="quridrag.html#decodeLocalFiles">TQUriDrag::decodeLocalFiles</a>(TQMimeSource*, TQStringList&)</tt>
-<li><tt>const TQStrList *TQDir::entryList(...) const</tt>
-becomes <tt>TQStringList <a href="ntqdir.html#entryList">TQDir::entryList</a>(...) const</tt>
-(note that the return type is no longer a pointer). You may also
-choose to use encodedEntryList().
-</ul>
-<p> The following functions are added:
-<ul>
-<li><tt>TQComboBox::insertStringList(const TQStringList &, int index=-1)</tt>
-<li><tt>TQListBox::insertStringList(const TQStringList &,int index=-1)</tt>
-</ul>
-<p> The rarely used static function <tt>void
-TQFont::listSubstitutions(<a href="ntqstrlist.html">TQStrList</a>*)</tt> is replaced by <tt>TQStringList
-<a href="ntqfont.html#substitutions">TQFont::substitutions</a>()</tt>.
-<p> <h3><a name="TQLayout">TQLayout</a></h3>
-<p> <p> Calling resize(0,0) or resize(1,1) will no longer work magically.
-Remove all such calls. The default size of top level widgets will be their
-<a href="ntqwidget.html#sizeHint">sizeHint()</a>.
-<p> <p> The default implementation of <a href="ntqwidget.html#sizeHint">TQWidget::sizeHint</a>() will no longer
-return just an invalid size; if the widget has a layout, it will return
-the layout's preferred size.
-<p> <p> The special maximum MaximumHeight/Width is now TQWIDGETSIZE_MAX,
-not TQCOORD_MAX.
-<p> <p> <a href="qboxlayout.html#addWidget">TQBoxLayout::addWidget()</a>
-now interprets the <em>alignment</em> parameter more aggressively. A
-non-default alignment now indicates that the widget should not grow to
-fill the available space, but should be sized according to sizeHint().
-If a widget is too small, set the alignment to 0. (Zero indicates no
-alignment, and is the default.)
-<p> <p> The class TQGManager is removed. Subclasses of <a href="ntqlayout.html">TQLayout</a> need to be rewritten
-to use the new, much simpler <a href="ntqlayout.html">TQLayout API</a>.
-<p> <p> For typical layouts, all use of
-<a href="ntqwidget.html#setMinimumSize">setMinimumSize()</a>
-and
-<a href="ntqwidget.html#setFixedSize">setFixedSize()</a>
-can be removed.
-<a href="ntqlayout.html#activate">activate()</a> is no longer necessary.
-<p> <p>
-You might like to look at the <a href="ntqgrid.html">TQGrid</a>, <a href="ntqvbox.html">TQVBox</a>, and <a href="ntqhbox.html">TQHBox</a> widgets - they offer
-a simple way to build nested widget structures.
-<p> <h3><a name="TQListView">TQListView</a></h3>
-<p> <p>In TQt 1.x mouse events to the viewport where redirected to the
-event handlers for the listview; in TQt 2.x, this functionality is
-in <a href="ntqscrollview.html">TQScrollView</a> where mouse (and other position-oriented) events are
-redirected to viewportMousePressEvent() etc, which in turn translate
-the event to the coordinate system of the contents and call
-contentsMousePressEvent() etc, thus providing events in the most
-convenient coordinate system. If you overrode TQListView::MouseButtonPress(),
-<a href="ntqwidget.html#mouseDoubleClickEvent">TQListView::mouseDoubleClickEvent</a>(), <a href="ntqwidget.html#mouseMoveEvent">TQListView::mouseMoveEvent</a>(), or
-<a href="ntqwidget.html#mouseReleaseEvent">TQListView::mouseReleaseEvent</a>() you must instead override
-viewportMousePressEvent(),
-viewportMouseDoubleClickEvent(), viewportMouseMoveEvent(), or
-viewportMouseReleaseEvent() respectively. New code will usually override
-contentsMousePressEvent() etc.
-<p> <p>The signal <a href="ntqlistview.html#selectionChanged">TQListView::selectionChanged</a>(<a href="qlistviewitem.html">TQListViewItem</a> *) can now be
-emitted with a null pointer as parameter. Programs that use the
-argument without checking for 0, may crash.
-<p> <h3><a name="TQMultiLineEdit">TQMultiLineEdit</a></h3>
-<p> <p>
-The protected function
-<pre> TQMultiLineEdit::textWidth(TQString*)</pre>
-
-changed to
-<pre> TQMultiLineEdit::textWidth(const <a href="ntqstring.html">TQString</a>&amp;)</pre>
- .
-This is unlikely to be a problem, and you'll get a compile error
-if you called it.
-<p> <h3><a name="TQClipboard">TQClipboard</a></h3>
-<p> <p>
-<pre> TQClipboard::pixmap()</pre>
- now returns a <a href="ntqpixmap.html">TQPixmap</a>, not a TQPixmap*.
-The pixmap
-will be <a href="ntqpixmap.html#isNull">null</a> if no pixmap is on the
-clipboard. <a href="ntqclipboard.html">TQClipboard</a> now offers powerful MIME-based types on the
-clipboard, just like drag-and-drop (in fact, you can reuse most of your
-drag-and-drop code with clipboard operations).
-<p> <h3><a name="TQDropSite">TQDropSite</a></h3>
-<p> <P>
-TQDropSite is obsolete. If you simply passed <tt>this</tt>, just remove
-the inheritance of TQDropSite and call
-<a href="ntqwidget.html#setAcceptDrops">setAcceptDrops(TRUE)</a> in the class
-constructor.
-If you passed something other than <tt>this</tt>,
-your code will not work. A common case is passing
-the
-<a href="ntqscrollview.html#viewport">viewport()</a> of a <a href="ntqlistview.html">TQListView</a>,
-in which case,
-override the
-<a href="ntqscrollview.html#contentsDragMoveEvent">contentsDragMoveEvent()</a>,
-etc.
-functions rather than TQListView's dragMoveEvent() etc. For other
-cases, you will need to use an event filter to act on the drag/drop events
-of another widget (as is the usual way to intercept foreign events).
-<p> <h3><a name="TQScrollView">TQScrollView</a></h3>
-<p> The parameters in the signal
-<a href="ntqscrollview.html#contentsMoving">contentsMoving(int,int)</a>
-are now positive rather than negative values, coinciding with
-<a href="ntqscrollview.html#setContentsPos">setContentsPos()</a>. Search for
-connections you make to this signal, and either change the slot they are
-connected to such that it also expects positive rather than negative
-values, or introduce an intermediate slot and signal that negates them.
-<p> If you used drag and drop with <a href="ntqscrollview.html">TQScrollView</a>, you may experience the problem
-described for <a href="#TQDropSite">TQDropSite</a>.
-<p> <h3><a name="TQTextStream">TQTextStream</a></h3>
-<p> <p>
-<pre> operator&lt;&lt;(TQTextStream&amp;, TQChar&amp;)</pre>
- does not skip whitespace.
-<pre> operator&lt;&lt;(TQTextStream&amp;, char&amp;)</pre>
- does,
-as was the case with TQt 1.x. This is for backward compatibility.
-<p> <h3><a name="TQUriDrag">TQUriDrag</a></h3>
-<p> The class TQUrlDrag is renamed to <a href="quridrag.html">TQUriDrag</a>, and the API has been
-broadened to include additional conversion routines, including
-conversions to Unicode filenames (see the class documentation
-for details). Note that in TQt 1.x
-the TQUrlDrag class used the non-standard MIME type "url/url",
-while TQUriDrag uses the standardized "text/uri-list" type. Other
-identifiers affected by the Url to Uri change are
-TQUrlDrag::setUrls() and TQUrlDrag::urlToLocalFile().
-<p> <h3><a name="TQPainter">TQPainter</a></h3>
-<p> <p> The GrayText painter flag has been removed. Use
-<a href="ntqpainter.html#setPen">setPen( palette().disabled().foreground() )</a>
-instead.
-<p> <p> The RasterOp enum
-(CopyROP,
-OrROP,
-XorROP,
-NotAndROP,
-EraseROP,
-NotCopyROP,
-NotOrROP,
-NotXorROP,
-AndROP, NotEraseROP,
-NotROP,
-ClearROP,
-SetROP,
-NopROP,
-AndNotROP,
-OrNotROP,
-NandROP,
-NorROP, LastROP)
-is now part of the TQt namespace class, so if you
-use it outside a member function, you'll need to prefix with TQt::.
-<p> <h3><a name="TQPicture">TQPicture</a></h3>
-<p> <p>The binary storage format of <a href="ntqpicture.html">TQPicture</a> is changed, but the TQt 2.x
-TQPicture class can both read and write TQt 1.x format TQPictures. No
-special handling is required for reading; TQPicture will automatically
-detect the version number. In order to write a TQt 1.x format TQPicture,
-set the formatVersion parameter to 1 in the TQPicture constructor.
-<p> <p>For writing TQt 1.x format TQPictures, the compatibility issues of <a
-href="#TQDataStream">TQDataStream</a> applies.
-<p> <p>It is safe to try to read a TQPicture file generated with TQt 2.x
-(without formatVersion set to 1) with a program compiled with TQt
-1.x. The program will not crash, it will just issue the warning
-"TQPicture::play: Incompatible version 2.x" and refuse to load the
-picture.
-<p> <h3><a name="TQPoint">TQPoint, <a href="ntqpointarray.html">TQPointArray</a>, <a href="ntqsize.html">TQSize</a> and <a href="ntqrect.html">TQRect</a></a></h3>
-<p> <p>The basic coordinate datatype in these classes, TQCOORD, is now 32
-bit (int) instead of a 16 bit (short). The const values TQCOORD_MIN and
-TQCOORD_MAX have changed accordingly.
-<p> <p>TQPointArray is now actually, not only seemingly, a TQArray of <a href="ntqpoint.html">TQPoint</a>
-objects. The semi-internal workaround classes TQPointData and TQPointVal
-are removed since they are no longer needed; TQPoint is used directly
-instead. The function <pre> TQPointArray::shortPoints()</pre>
-
-provides the point array converted to short (16bit) coordinates for
-use with external functions that demand that format.
-<p> <h3><a name="TQImage">TQImage</a></h3>
-<p> <a href="ntqimage.html">TQImage</a> uses TQRgb for the colors - see <a href="#TQRgb">the changes to that</a>.
-<p> <h3><a name="TQPixmap">TQPixmap</a></h3>
-<p> <pre> TQPixmap::convertToImage()</pre>
- with bitmaps now guarantees that color0 pixels
-become color(0) in the resulting TQImage. If you worked around the lack of
-this, you may be able to simplify your code. If you made assumptions
-about the previous undefined behavior, the symptom will be inverted
-bitmaps (eg. "inside-out" masks).
-<p> <p>
-<pre> TQPixmap::optimize(TRUE)</pre>
-
-is replaced by
-<pre> TQPixmap::setOptimization(TQPixmap::NormalOptim)</pre>
-
-or
-<pre> TQPixmap::setOptimization(TQPixmap::BestOptim)</pre>
-
-- see the documentation
-to choose which is best for your application. NormalOptim is most like
-the TQt 1.x "TRUE" optimization.
-<p> <h3><a name="TQMenuData">TQMenuData / <a href="ntqpopupmenu.html">TQPopupMenu</a></a></h3>
-<p> In TQt 1.x, new menu items were assigned either an application-wide
-unique identifier or an identifier equal to the index of the item, depending on the
-<a href="ntqmenudata.html#insertItem">insertItem(...)</a> function used.
-In TQt 2.x this confusing
-situation has been cleaned up: generated identifiers are always
-unique across the entire application.
-<p> If your code depends on generated ids
-being equal to the item's index, a quick fix is to use
-<pre> TQMenuData::indexOf(int id)</pre>
-
-in the handling function instead. You may alternatively pass
-<pre> TQMenuData::count()</pre>
-
-as identifier when you insert the items.
-<p> Furthermore, TQPopupMenus can (and should!) be created with a parent
-widget now, for example the main window that is used to display the
-popup. This way, the popup will automatically be destroyed together
-with its main window. Otherwise you'll have to take care of the
-ownership manually.
-<p> TQPopupMenus are also reusable in 2.x. They may occur in different
-locations within one menu structure or be used as both a menubar
-drop-down and as a context popup-menu. This should make it possible to
-significantly simplify many applications.
-<p> Last but not least, <a href="ntqpopupmenu.html">TQPopupMenu</a> no longer inherits TQTableView. Instead,
-it directly inherits <a href="ntqframe.html">TQFrame</a>.
-<p> <h3><a name="TQValidator">TQValidator (<a href="ntqlineedit.html">TQLineEdit</a>, <a href="ntqcombobox.html">TQComboBox</a>, <a href="ntqspinbox.html">TQSpinBox</a>) </a></h3>
-<p> <pre> TQValidator::validate(...)</pre>
-
-and
-<pre> TQValidator::fixup( <a href="ntqstring.html">TQString</a> &amp; )</pre>
-
-are now const
-functions. If your subclass reimplements validate() as a
-non-const function,
-you will get a compile error (validate was pure virtual).
-<p> In TQLineEdit, TQComboBox, and TQSpinBox,
-setValidator(...) now takes a const pointer to a <a href="ntqvalidator.html">TQValidator</a>, and
-validator() returns a const pointer. This change highlights the fact
-that the widgets do not take the ownership of the validator (a validator is
-a <a href="ntqobject.html">TQObject</a> on its own, with its own parent - you can easily set the same validator
-object on many different widgets), so changing the state of
-such an object or deleting it is very likely a bug.
-<p> <h3><a name="TQFile">TQFile, <a href="ntqfileinfo.html">TQFileInfo</a>, <a href="ntqdir.html">TQDir</a></a></h3>
-<p> File and directory names are now always Unicode strings (ie. <a href="ntqstring.html">TQString</a>). If you used TQString
-in the past for the simplicity it offers, you'll probably have little consequence. However,
-if you pass filenames to system functions rather than using TQt functions (eg. if you use the
-Unix <tt>unlink()</tt> function rather than <tt>TQFile::remove()</tt>, your code will probably
-only work for Latin1 locales (eg. Western Europe, the U.S.). To ensure your code will support
-filenames in other locales, either use the TQt functions, or convert the filenames via
-<pre> TQFile::encodeFilename()</pre>
- and <pre> TQFile::decodeFilename()</pre>
- - but do it
-<em>just</em> as you call the system function - code that mixes encoded and unencoded filenames
-is very error prone. See the comments in TQString, such as regarding TQT_NO_ASCII_CAST that
-can help find potential problems.
-<p> <h3><a name="TQFontMetrics">TQFontMetrics</a></h3>
-<p> boundingRect(char) is replaced by
-boundingRect(<a href="qchar.html">TQChar</a>), but since
-char auto-converts to TQChar, you're not likely to run into problems
-with this.
-<p> <h3><a name="TQWindow">TQWindow</a></h3>
-<p> This class (which was just <a href="ntqwidget.html">TQWidget</a> under a different name) has been
-removed. If you used it, do a global search-and-replace of the word
-"TQWindow" with "TQWidget".
-<p> <h3><a name="TQEvent">TQEvent</a></h3>
-<p> <p> The global #define macros in ntqevent.h have been replaced by an
-enum in <a href="ntqevent.html">TQEvent</a>. Use e.g. TQEvent::Paint instead of Event_Paint. Same
-for all of:
-Event_None,
-Event_Timer,
-Event_MouseButtonPress,
-Event_MouseButtonRelease,
-Event_MouseButtonDblClick,
-Event_MouseMove,
-Event_KeyPress,
-Event_KeyRelease,
-Event_FocusIn,
-Event_FocusOut,
-Event_Enter,
-Event_Leave,
-Event_Paint,
-Event_Move,
-Event_Resize,
-Event_Create,
-Event_Destroy,
-Event_Show,
-Event_Hide,
-Event_Close,
-Event_Quit,
-Event_Accel,
-Event_Clipboard,
-Event_SockAct,
-Event_DragEnter,
-Event_DragMove,
-Event_DragLeave,
-Event_Drop,
-Event_DragResponse,
-Event_ChildInserted,
-Event_ChildRemoved,
-Event_LayoutHint,
-Event_ActivateControl,
-Event_DeactivateControl,
-and
-Event_User.
-<p> <p> The Q_*_EVENT macros in ntqevent.h have been deleted. Use an
-explicit cast instead. The macros were:
-Q_TIMER_EVENT,
-Q_MOUSE_EVENT,
-Q_KEY_EVENT,
-Q_FOCUS_EVENT,
-Q_PAINT_EVENT,
-Q_MOVE_EVENT,
-Q_RESIZE_EVENT,
-Q_CLOSE_EVENT,
-Q_SHOW_EVENT,
-Q_HIDE_EVENT,
-and
-Q_CUSTOM_EVENT.
-<p> <p> TQChildEvents are now sent for all TQObjects, not just TQWidgets.
-You may need to add extra checking if you use a <a href="qchildevent.html">TQChildEvent</a> without
-much testing of its values.
-<p> <h3>All the removed functions</h3>
-<p> All <a href="removed20.html">these functions</a> have been removed in
-TQt 2.x. Most are simply cases where "const char*" has changed to
-"const <a href="ntqstring.html">TQString</a>&", or when an enumeration type has moved into the TQt::
-namespace (which, technically, is a new name, but your code will
-compile just the same anyway). This list is provided for completeness.
-<p>
-<!-- eof -->
-<p><address><hr><div align=center>
-<table width=100% cellspacing=0 border=0><tr>
-<td>Copyright &copy; 2007
-<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
-<td align=right><div align=right>TQt 3.3.8</div>
-</table></div></address></body>
-</html>