docs/html/faqgtk.htm

   1 <HTML>
   2
   3 <HEAD>
   4 <TITLE>wxWindows 2 for GTK FAQ</TITLE>
   5 </HEAD>
   6
   7 <BODY BGCOLOR=#FFFFFF TEXT=#000000 VLINK="#00376A" LINK="#00529C" ALINK="#313063">
   8
   9 <font face="Arial, Lucida Sans, Helvetica">
  10
  11 <table width=100% border=0 cellpadding=3 cellspacing=0>
  12 <tr>
  13 <td bgcolor="#004080" align=left height=24 background="images/bluetitlegradient.gif">
  14 <font size=+1 face="Arial, Lucida Sans, Helvetica" color="#FFFFFF">
  15 <b>wxWindows 2 for GTK FAQ</b>
  16 </font>
  17 </td>
  18 </tr>
  19 </table>
  20
  21 <P>
  22
  23 See also <a href="faq.htm">top-level FAQ page</a>.
  24 <hr>
  25 <h3>List of questions in this category</h3>
  26
  27 <ul>
  28 <li><a href="#wxgtk">What is wxWindows 2 for GTK?</a></li>
  29 <li><a href="#locale">Why doesn&#39;t reading floating point numbers work when using wxWindows?</a></li>
  30 <li><a href="#gnome">Does wxGTK have GNOME support?</a></li>
  31 <li><a href="#redhat">Warning about GTK libraries supplied with RedHat</a></li>
  32 <li><a href="#wxgtk">What is wxWindows 2 for GTK?</a></li>
  33 <li><a href="#bincompat">What range of Intel Linux platforms will a given application binary be usable on?</a></li>
  34 </ul>
  35
  36 <hr>
  37
  38 <h3><a name="wxgtk">What is wxWindows 2 for GTK?</a></h3>
  39
  40 wxWindows 2 for GTK is a port of wxWindows to the <a href="http://www.gimp.org/gtk" target=_top>GTK+ toolkit</a>,
  41 which is freely available for most flavours of Unix with X. wxWindows 2 for GTK is
  42 often abbreviated to wxGTK. wxGTK has a separate home page <a href="http://www.freiburg.linux.de/~wxxt" target=_top>here</a>.
  43 <P>
  44
  45 <h3><a name="locale">Why doesn&#39;t reading floating point numbers work when using wxWindows?</a></h3>
  46
  47 If your program reads the floating point numbers in the format <tt>123.45</tt>
  48 from a file, it may suddently start returning just <tt>123</tt> instead of the
  49 correct value on some systems -- which is all the more mysterious as the same
  50 code in a standalone program works just fine.
  51
  52 <p>
  53 The explanation is that GTK+ changes the current locale on program startup. If
  54 the decimal point character in the current locale is not the period (for
  55 example, it is comma in the French locale), all the standard C functions won&#39;t
  56 recognize the numbers such as above as floating point ones any more.
  57
  58 <p>
  59 The solution is to either use your own function for reading the floating point
  60 numbers (probably the best one) or to call <tt>setlocale(LC_NUMERIC, "C")</tt>
  61 before reading from file and restore the old locale back afterwards if needed.
  62
  63 <h3><a name="gnome">Does wxGTK have GNOME support?</a></h3>
  64
  65 Currently wxGTK does not have any features that would involve dependence on any desktop
  66 environment&#39;s libraries, so it can work on GNOME, KDE and with other window managers
  67 without installation hassles. Some GNOME and KDE integration features are file based, and
  68 so may be added without dependence on libraries. Other features may be supported in the
  69 future, probably as a separate library.
  70 <P>
  71
  72 <h3><a name="redhat">Warning about GTK libraries supplied with RedHat</a></h3>
  73
  74 It seems that some versions of RedHat include a badly patched version of GTK (not wxGTK)
  75 which causes some trouble with wxWindows&#39; socket code. Common symptoms are that when
  76 a client tries to establish a connection to an existing server which refuses the request,
  77 the client will get notified twice, first getting a LOST event and then a CONNECT event.
  78 This problem can be solved by updating GTK with an official distribution of the library.
  79 <P>
  80
  81 <h3><a name="bincompat">What range of Intel Linux platforms will a given application binary be usable on?</h3>
  82
  83 Robert Roebling replies:<P>
  84
  85 "The important thing is the libc version that your app
  86 is linked against. The most recent version is 2.2.5
  87 and programs linked against it will not run with version
  88 2.1.X so that you will fare best if you compile your app
  89 on a 2.1.X system. It will then run on practically all
  90 Linux distros (if you link you app statically against
  91 the image libraries and std C++ lib)."
  92
  93 </font>
  94
  95 </BODY>
  96
  97 </HTML>