2004-02-25 05:45:02 -05:00
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1999-01-19 06:00:22 -05:00
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<HTML>
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<HEAD>
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2004-02-25 05:45:02 -05:00
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<TITLE>wxWidgets 2 for GTK FAQ</TITLE>
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1999-01-19 06:00:22 -05:00
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</HEAD>
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2002-04-08 16:17:40 -04:00
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<BODY BGCOLOR=#FFFFFF TEXT=#000000 VLINK="#00376A" LINK="#00529C" ALINK="#313063">
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1999-01-19 06:00:22 -05:00
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<font face="Arial, Lucida Sans, Helvetica">
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2002-04-08 16:17:40 -04:00
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<table width=100% border=0 cellpadding=3 cellspacing=0>
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<tr>
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<td bgcolor="#004080" align=left height=24 background="images/bluetitlegradient.gif">
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<font size=+1 face="Arial, Lucida Sans, Helvetica" color="#FFFFFF">
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2004-02-25 05:45:02 -05:00
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<b>wxWidgets 2 for GTK FAQ</b>
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1999-01-19 06:00:22 -05:00
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</font>
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</td>
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</tr>
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</table>
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<P>
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2004-02-25 05:45:02 -05:00
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See also <a href="faq.htm">top-level FAQ page</a>
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and <a href="faqunx.htm">Unix FAQ page</a>.
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<hr>
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2001-11-20 09:55:10 -05:00
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<h3>List of questions in this category</h3>
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<ul>
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2004-02-25 05:45:02 -05:00
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<li><a href="#wxgtk">What is wxWidgets 2 for GTK+?</a></li>
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<li><a href="#locale">Why doesn't reading floating point numbers work when using wxWidgets?</a></li>
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2001-11-20 09:55:10 -05:00
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<li><a href="#gnome">Does wxGTK have GNOME support?</a></li>
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<li><a href="#redhat">Warning about GTK libraries supplied with RedHat</a></li>
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2002-08-16 05:55:54 -04:00
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<li><a href="#bincompat">What range of Intel Linux platforms will a given application binary be usable on?</a></li>
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2002-12-04 09:11:26 -05:00
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<li><a href="#static">Can I statically link the GTK+ library?</a></li>
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2003-08-25 21:32:14 -04:00
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<li><a href="#charinframe">Why does my simple program using <tt>EVT_CHAR</tt> not work?</a></li>
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<li><a href="#debugging">How do I trace the cause of an X11 error such as BadMatch?</a></li>
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</ul>
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2002-06-05 17:06:18 -04:00
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2001-11-20 09:55:10 -05:00
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<hr>
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1999-01-19 06:00:22 -05:00
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2004-02-25 05:45:02 -05:00
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<h3><a name="wxgtk">What is wxWidgets 2 for GTK?</a></h3>
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2004-02-25 05:45:02 -05:00
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wxWidgets 2 for GTK is a port of wxWidgets to the <a href="http://www.gimp.org/gtk" target=_top>GTK+ toolkit</a>,
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which is freely available for most flavours of Unix with X. wxWidgets 2 for GTK is
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often abbreviated to wxGTK. wxGTK has a separate home page <a href="http://www.freiburg.linux.de/~wxxt" target=_top>here</a>.
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<P>
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2004-02-25 05:45:02 -05:00
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<h3><a name="locale">Why doesn't reading floating point numbers work when using wxWidgets?</a></h3>
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2002-08-16 05:55:54 -04:00
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If your program reads the floating point numbers in the format <tt>123.45</tt>
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from a file, it may suddently start returning just <tt>123</tt> instead of the
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correct value on some systems -- which is all the more mysterious as the same
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code in a standalone program works just fine.
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<p>
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The explanation is that GTK+ changes the current locale on program startup. If
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the decimal point character in the current locale is not the period (for
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example, it is comma in the French locale), all the standard C functions won't
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recognize the numbers such as above as floating point ones any more.
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<p>
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The solution is to either use your own function for reading the floating point
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numbers (probably the best one) or to call <tt>setlocale(LC_NUMERIC, "C")</tt>
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before reading from file and restore the old locale back afterwards if needed.
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2001-11-20 09:55:10 -05:00
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<h3><a name="gnome">Does wxGTK have GNOME support?</a></h3>
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Currently wxGTK does not have any features that would involve dependence on any desktop
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environment's libraries, so it can work on GNOME, KDE and with other window managers
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without installation hassles. Some GNOME and KDE integration features are file based, and
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so may be added without dependence on libraries. Other features may be supported in the
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future, probably as a separate library.
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<P>
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2002-12-04 09:11:26 -05:00
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<h3><a name="redhat">Warning about GTK+ libraries supplied with RedHat</a></h3>
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It seems that some versions of RedHat include a badly patched version of GTK+ (not wxGTK)
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which causes some trouble with wxWidgets' socket code. Common symptoms are that when
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a client tries to establish a connection to an existing server which refuses the request,
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the client will get notified twice, first getting a LOST event and then a CONNECT event.
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This problem can be solved by updating GTK with an official distribution of the library.
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<P>
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2002-06-05 17:06:18 -04:00
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<h3><a name="bincompat">What range of Intel Linux platforms will a given application binary be usable on?</h3>
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Robert Roebling replies:<P>
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"The important thing is the libc version that your app
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is linked against. The most recent version is 2.2.5
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and programs linked against it will not run with version
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2.1.X so that you will fare best if you compile your app
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on a 2.1.X system. It will then run on practically all
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Linux distros (if you link you app statically against
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the image libraries and std C++ lib)."
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2002-12-04 09:11:26 -05:00
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<P>
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<h3><a name="#static">Can I statically link the GTK+ library?</a></h3>
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No, this is not possible. It leads to crashes in GTK+.
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<P>
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<h3><a name="#charinframe">Why does my simple program using
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2003-08-25 21:32:14 -04:00
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<tt>EVT_CHAR</tt> not work?</a></h3>
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2002-12-04 09:11:26 -05:00
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In wxGTK, the frames never get focus and so can never receive <tt>CHAR</tt>
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nor <tt>KEY</tt> events so an <tt>EVT_CHAR</tt> handler for a frame will be
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never called. To receive these events, you should create a <tt>wxPanel</tt>
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inside the frame and register the key event handlers for the panel, not the
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frame.
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<p>
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1999-01-19 06:00:22 -05:00
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2003-08-25 21:32:14 -04:00
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<h3><a name="#debugging">How do I trace the cause of an X11 error such as BadMatch?</h3>
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When a fatal X11 error occurs, the application quits with no stack trace.
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To find out where the problem is, put a breakpoint on g_log (<tt>b g_log</tt>
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in gdb).
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<p>
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1999-01-19 06:00:22 -05:00
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</font>
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</BODY>
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</HTML>
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