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make wxScrollBar derive from wxScrollBarBase under wxMac too
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16<b>wxWidgets for GTK FAQ</b>
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24See also <a href="faq.htm">top-level FAQ page</a>
25and <a href="faqunx.htm">Unix FAQ page</a>.
26<hr>
27<h3>List of questions in this category</h3>
28
29<ul>
30<li><a href="#wxgtk">What is wxWidgets for GTK+?</a></li>
31<li><a href="#locale">Why doesn&#39;t reading floating point numbers work when using wxWidgets?</a></li>
32<li><a href="#gnome">Does wxGTK have GNOME support?</a></li>
33<li><a href="#redhat">Warning about GTK libraries supplied with RedHat</a></li>
34<li><a href="#bincompat">What range of Intel Linux platforms will a given application binary be usable on?</a></li>
35<li><a href="#static">Can I statically link the GTK+ library?</a></li>
36<li><a href="#charinframe">Why does my simple program using <tt>EVT_CHAR</tt> not work?</a></li>
37<li><a href="#debugging">How do I trace the cause of an X11 error such as BadMatch?</a></li>
38</ul>
39
40<hr>
41
42<h3><a name="wxgtk">What is wxWidgets for GTK?</a></h3>
43
44wxWidgets for GTK is a port of wxWidgets to the <a href="http://www.gimp.org/gtk" target=_top>GTK+ toolkit</a>,
45which is freely available for most flavours of Unix with X. wxWidgets for GTK is
46often abbreviated to wxGTK. wxGTK has a separate home page <a href="http://www.freiburg.linux.de/~wxxt" target=_top>here</a>.
47<P>
48
49<h3><a name="locale">Why doesn&#39;t reading floating point numbers work when using wxWidgets?</a></h3>
50
51If your program reads the floating point numbers in the format <tt>123.45</tt>
52from a file, it may suddenly start returning just <tt>123</tt> instead of the
53correct value on some systems -- which is all the more mysterious as the same
54code in a standalone program works just fine.
55
56<p>
57The explanation is that GTK+ changes the current locale on program startup. If
58the decimal point character in the current locale is not the period (for
59example, it is comma in the French locale), all the standard C functions won&#39;t
60recognize the numbers such as above as floating point ones any more.
61
62<p>
63The solution is to either use your own function for reading the floating point
64numbers (probably the best one) or to call <tt>setlocale(LC_NUMERIC, "C")</tt>
65before reading from file and restore the old locale back afterwards if needed.
66
67<h3><a name="gnome">Does wxGTK have GNOME support?</a></h3>
68
69Currently wxGTK does not have any features that would involve dependence on any desktop
70environment&#39;s libraries, so it can work on GNOME, KDE and with other window managers
71without installation hassles. Some GNOME and KDE integration features are file based, and
72so may be added without dependence on libraries. Other features may be supported in the
73future, probably as a separate library.
74<P>
75
76<h3><a name="redhat">Warning about GTK+ libraries supplied with RedHat</a></h3>
77
78It seems that some versions of RedHat include a badly patched version of GTK+ (not wxGTK)
79which causes some trouble with wxWidgets&#39; socket code. Common symptoms are that when
80a client tries to establish a connection to an existing server which refuses the request,
81the client will get notified twice, first getting a LOST event and then a CONNECT event.
82This problem can be solved by updating GTK with an official distribution of the library.
83<P>
84
85<h3><a name="bincompat">What range of Intel Linux platforms will a given application binary be usable on?</h3>
86
87Robert Roebling replies:<P>
88
89&#34;The important thing is the libc version that your app
90is linked against. The most recent version is 2.2.5
91and programs linked against it will not run with version
922.1.X so that you will fare best if you compile your app
93on a 2.1.X system. It will then run on practically all
94Linux distros (if you link you app statically against
95the image libraries and std C++ lib).&#34;
96<P>
97
98<h3><a name="#static">Can I statically link the GTK+ library?</a></h3>
99
100No, this is not possible. It leads to crashes in GTK+.
101<P>
102
103<h3><a name="#charinframe">Why does my simple program using
104<tt>EVT_CHAR</tt> not work?</a></h3>
105
106In wxGTK, the frames never get focus and so can never receive <tt>CHAR</tt>
107nor <tt>KEY</tt> events so an <tt>EVT_CHAR</tt> handler for a frame will be
108never called. To receive these events, you should create a <tt>wxPanel</tt>
109inside the frame and register the key event handlers for the panel, not the
110frame.
111
112<p>
113
114<h3><a name="#debugging">How do I trace the cause of an X11 error such as BadMatch?</h3>
115
116When a fatal X11 error occurs, the application quits with no stack trace.
117To find out where the problem is, put a breakpoint on g_log (<tt>b g_log</tt>
118in gdb).
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