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5<TITLE>wxWindows 2 FAQ: General</TITLE>
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16<b>wxWindows 2 FAQ: General</b>
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22<P>
23
24See also <a href="faq.htm">top-level FAQ page</a>.
25<hr>
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26<h3>List of questions in this category</h3>
27<ul>
28<li><a href="#whatis">What is wxWindows?</a></li>
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29<li><a href="#licence">Can I use wxWindows 2 for both proprietary projects, and GPL&#39;ed projects?</a></li>
30<li><a href="#support">Is there support?</a></li>
8b283bb8 31<li><a href="#users">Who uses wxWindows?</a></li>
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32<li><a href="#platforms">What platforms are supported by wxWindows?</a></li>
33<li><a href="#specific">How does wxWindows support platform-specific features?</a></li>
8b283bb8 34<li><a href="#stl">Does wxWindows use STL? or the standard string class?</a></li>
2b5f62a0 35<li><a href="#richedit">Is there a rich edit/markup widget for wxWindows?</a></ li>
53e112a0 36<li><a href="#exceptions">How to use C++ exceptions with wxWindows?</a></ li>
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37<li><a href="#dev">How is wxWindows being developed?</a></li>
38<li><a href="#distrib">How is wxWindows distributed?</a></li>
8b283bb8 39<li><a href="#future">What are the plans for the future?</a></li>
2b5f62a0 40<li><a href="#base">What is wxBase?</a></li>
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41<li><a href="#univ">What is wxUniversal?</a></li>
42<li><a href="#jave">What about Java?</a></li>
c2d48b36 43<li><a href="#dotnet">What about .NET/Mono?</a></li>
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44<li><a href="#help">How can I help the project?</a></li>
45</ul>
46<hr>
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47
48<H3><a name="whatis">What is wxWindows?</a></H3>
49
50wxWindows is a class library that allows you to compile graphical C++ programs on a range of
51different platforms. wxWindows defines a common API across platforms, but uses the native graphical user interface (GUI) on each platform,
8b283bb8 52so your program will take on the native &#39;look and feel&#39; that users are familiar with.<P>
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53
54Although GUI applications are mostly built programmatically, there is a dialog editor to help
8b283bb8 55build attractive dialogs and panels. Robert Roebling&#39;s <a href="http://www.roebling.com">wxDesigner</a>
51ab9400 56makes light work of resizable, portable dialogs.<P>
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58You don&#39;t have to use C++ to use wxWindows: there is a <a href="http://wxpython.org">Python interface</a> for wxWindows 2,
59and also a <a href="http://wxperl.sourceforge.net" target=_top>Perl interface</a>.
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60<P>
61
2b5f62a0 62<h3><a name="licence">Can I use wxWindows 2 for both proprietary (commercial) projects, and GPL&#39;ed projects?</a></h3>
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63
64Yes. Please see the <a href="newlicen.htm">licence</a> for details, but basically
65you can distribute proprietary binaries without distributing any source code, and neither will wxWindows
66conflict with GPL code you may be using or developing with it.
67<P>
68The conditions for using wxWindows 2 are the same whether you are a personal, academic
69or commercial developer.
70<P>
71
2b5f62a0 72<h3><a name="support">Is there support?</a></h3>
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73
74No official support, but the mailing list is very helpful and some people say that
75wxWindows support is better than for much commercial software. The developers are
76keen to fix bugs as soon as possible, though obviously there are no guarantees.
77<P>
78
79<H3><a name="users">Who uses wxWindows?</a></H3>
80
81Many organisations - commercial, government, and academic - across the
8b283bb8 82world. It&#39;s impossible to estimate the true number of users, since
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83wxWindows is obtained by many different means, and we cannot monitor
84distribution. The mailing list contains around 300-400 entries which is
85quite large for a list of this type.<P>
86
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87See <a href="users.htm">Users</a> for a list of some users and their applications, and
88also <A href="feedback.htm">Feedback</a> for comments.<P>
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89Our highest-profile user yet is industry veteran and Lotus Corp. founder Mitch Kapor
90and his <a href="http://www.osafoundation.org" target=_new>Open Source Applications Foundation</a>.
91<P>
b953bdc2 92
8b283bb8 93<H3><a name="platforms">What platforms are supported by wxWindows 2?</a></H3>
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94
95<ul>
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96<li>Windows 3.1, Windows 95/98, Windows NT, Windows 2000, Windows ME.
97<li>Linux and other Unix platforms with GTK+.
98<li>Unix with Motif or the free Motif clone Lesstif.
99<li>Mac OS.
100<li>Embedded platforms are being investigated. See the <a href="wxuniv.htm">wxUniversal</a> project.
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101<li>An OS/2 port is in progress, and you can also compile wxWindows for GTK+ or Motif
102on OS/2.
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103</ul>
104<P>
105
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106<H3><a name="specific">How does wxWindows 2 support platform-specific
107features?</a></H3>
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108
109This is a hotly-debated topic amongst the developers. My own philosophy
110is to make wxWindows as platform-independent as possible, but allow in a
111few classes (functions, window styles) that are platform-specific.
112For example, Windows metafiles and Windows 95 taskbar icons have
113their own classes on Windows, but nowhere else. Because these classes
8b283bb8 114are provided and are wxWindows-compatible, it doesn&#39;t take much
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115coding effort for an application programmer to add support for
116some functionality that the user on a particular platform might otherwise
117miss. Also, some classes that started off as platform-specific, such
118as the MDI classes, have been emulated on other platforms. I can imagine
119that even wxTaskBarIcon may be implemented for Unix desktops one day.
120<P>
121
8b283bb8 122In other words, wxWindows is not a &#39;lowest common denominator&#39; approach,
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123but it will still be possible to write portable programs using the
124core API. Forbidding some platform-specific classes would be a stupid
125approach that would alienate many potential users, and encourage
126the perception that toolkits such as wxWindows are not up to the demands
8b283bb8 127of today&#39;s sophisticated applications.<P>
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128
129Currently resources such as bitmaps and icons are handled in a platform-specific
130way, but it is hoped to reduce this dependence in due course.<P>
131
8b283bb8 132Another reason why wxWindows 2 is not a &#39;lowest common denominator&#39; toolkit is that
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133some functionality missing on some platform has been provided using generic,
134platform-independent code, such as the wxTreeCtrl and wxListCtrl classes.<P>
135
8b283bb8 136<H3><a name="stl">Does wxWindows use STL? or the standard string class?</a></H3>
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137
138No. This is a much-discussed topic that has (many times) ended with the conclusion that it is in
8b283bb8 139wxWindows&#39; best interests to avoid use of templates. Not all compilers can handle
b953bdc2 140templates adequately so it would dramatically reduce the number of compilers
cd508246 141and platforms that could be supported. It would also be undersirable to make
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142wxWindows dependent on another large library that may have to be downloaded and installed.
143In addition, use of templates can lead to executable bloat, which is something
cd508246 144wxWindows 2 is strenously trying to avoid.<P>
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145
146The standard C++ string class is not used, again because it is not available to all compilers,
147and it is not necessarily a very efficient implementation. Also, we retain more flexibility
148by being able to modify our own string class. Some compatibility with the string class
149has been built into wxString.<P>
150
151There is nothing to stop an application using templates or the string class for its own
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152purposes. With wxWindows debugging options on, you may find you get errors when including
153STL headers. You can work around it either by switching off memory checking,
154or by adding this to a header before you include any STL files:<P>
155
156<PRE>
157&#35;ifdef new
158&#35;undef new
159&#35;endif
160</PRE>
161
162<P>
163
b953bdc2 164
8b283bb8 165<H3><a name="richedit">Is there a rich edit/markup widget for wxWindows 2?</a></H3>
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166
167These are the possibilities so far:<P>
168
169<ul>
790ad94f 170<li>See <a href="http://www.scintilla.org" target=_top>www.scintilla.org</a> for
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171a very nice syntax-highlighting editor widget. Robin Dunn has written a wxWindows wrapper
172for this widget, available in the wxWindows distribution under contrib/src/stc.
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173<li>If you only need to display marked-up information, rather than edit it,
174then wxHTML will suit your needs. wxHTML is built into wxWindows - please see the reference
175manual for details, and samples/html.
176<li>There are rich edit widgets in both WIN32 and GTK+, but there is currently
8b283bb8 177no wxWindows wrapper for these (but text attribute functions are being added in the wxWindows 2.3.x series).
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178</ul>
179
180<P>
181
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182<h3><a name="exceptions">How to use C++ exceptions with wxWindows?</a></h3>
183
184wxWindows library itself is unfortunately <i>not</i> exception-safe (as its
185initial version predates, by far, the addition of the exceptions to the C++
186language). However you can still use the exceptions in your own code and use
187the other libraries using the exceptions for the error reporting together with
188wxWindows.
189
190<p>
191There are a few issues to keep in mind, though:
192<ul>
193 <li>You shouldn&#39;t let the exceptions propagate through wxWindows code,
194 in particular you should always catch the exceptions thrown by the
195 functions called from an event handler in the handler itself and not
196 let them propagate upwards to wxWindows.
197
198 <li>You may need to ensure that the compiler support for the exceptions is
199 enabled as, considering that wxWindows itself doesn&#39;t use the
200 exceptions and turning their support on results in the library size
201 augmentation of 10% to 20%, it is turned off by default for a few
202 compilers. Moreover, for gcc (or at least its mingw version) you must
203 also turn on the RTTI support to be able to use the exceptions, so you
204 should use <tt>--disable-no_rtti --disable-no_exceptions</tt> options
205 when configuring the library (attention to the double negation).
206</ul>
207
208<p>
209
2b5f62a0 210<H3><a name="dev">How is wxWindows being developed?</a></H3>
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211
212We are using the <a href="cvs.htm">CVS</a> system to develop and maintain wxWindows. This allows
2b5f62a0 213us to make alterations and upload them instantly to the server, from
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214which others can update their source.<P>
215
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216To build source from CVS, see the file BuildCVS.txt in the top-level wxWindows distribution
217directory.<P>
218
2b5f62a0 219<H3><a name="distrib">How is wxWindows distributed?</a></H3>
b953bdc2 220
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221By ftp, and via the <a href="cdrom2.htm">wxWindows CD-ROM</a>.
222<P>
223If you are feeling adventurous, you may also check out the sources directly
2b5f62a0 224from <a href="cvs.htm">cvs</a>.
8b283bb8 225<p>
b953bdc2 226
8b283bb8 227<H3><a name="future">What are the plans for the future?</a></H3>
b953bdc2 228
2b5f62a0 229Currently we&#39;re working too hard on getting wxWindows finished (are GUI toolkits ever
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230finished?) to think very far ahead. However, we know we want to make wxWindows as robust
231and well-publicised as possible. We also want to aim for better platform-independence of
2b5f62a0 232resources such as icons and bitmaps, standardising on PNG and XPM for all platforms.<P>
b953bdc2 233
91c93c99 234Other possibilities include: DCOM/CORBA compatibility; a wxWindows book;
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235<a href="http://wxworkshop.sourceforge.net/">wxWorkshop</a>, an IDE;
236other platforms, especially embedded systems; other interface abilities such as speech output.<P>
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237
238We will investigate the possibility of compiler or operating system vendors bundling wxWindows with
239their product.<P>
240
241The high-level goal of wxWindows is to be thought of as the number one C++ framework,
242for virtually any platform. Move over, MFC!<P>
243
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244<h3><a name="base">What is wxBase?</a></h3>
245
246wxBase is a subset of wxWindows comprised by the non-GUI classes. It includes
247wxWindows container and primitive data type classes (including wxString,
248wxDateTime and so on) and also useful wrappers for the operating system objects
249such as files, processes, threads, sockets and so on. With very minor
250exceptions wxBase may be used in exactly the same way as wxWindows but it
251doesn&#39;t require a GUI to run and so is ideal for creating console mode
252utilities or server programs. It is also possible to create a program which can
253be compiled either as a console application (using wxBase) or a GUI one (using
254a full featured wxWindows port).
255
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256<H3><a name="univ">What is wxUniversal?</a></H3>
257
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258The main difference between wxUniversal-based ports (such as wxX11, wxMGL) and other ports (such as wxMSW, wxGTK+, wxMac)
259is that wxUniversal implements all controls (or widgets) in
260wxWindows itself thus allowing to have much more flexibility (for example, support for
261themes even under MS Windows). It also means that it is now much easier to
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262port wxWindows to a new platform as only the low-level classes must be ported
263which make for a small part of the library.
264<p>
265You may find more about wxUniversal <a href=wxuniv.htm>here</a>.
266
267<H3><a name="jave">What about Java?</a></H3>
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268
269The Java honeymoon period is over :-) and people are realising that it cannot
8b283bb8 270meet all their cross-platform development needs. We don&#39;t anticipate a major threat
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271from Java, and the level of interest in wxWindows is as high as ever.<P>
272
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273<H3><a name="dotnet">What about .NET/Mono?</a></H3>
274
275Microsoft is spending a lot on promoting the .NET initiative, which
276is a set of languages, APIs and web service components for Windows.
277Ximian has started an open source version of .NET, mostly for Linux.
278C&#35; is Microsoft's alternative to Java, supporting 'managed code',
279garbage collection and various other Java-like language features.<P>
280
281Although this may be attractive to some developers, there
282is a variety of reasons why the .NET/Mono combination is unlikely
283to make wxWindows redundant. Please note that the following comments
284are Julian Smart's opinions.<P>
285
286<ol>
287<li>Not everyone wants or needs net services.
288<li>C++ will be used for a long time to come; compared with C++, C&#35; is a recent development and its future is not certain.
289<li>Mono Forms may only target Winelib (at least to begin with), so the end result is not as native as
290wxWindows (I'm aware there is GTK&#35; for use with the C&#35; language).
291<li>C&#35; is usually byte-compiled and therefore slower. Plus, .NET adds a layer of overhead to the client computer
292that wxWindows does not require.
293<li>Mono hasn't proven its long-term viability yet (it's a complex system of components); wxWindows is ready now.
294<li>You may not wish to buy into Microsoft marketing spin and APIs.
295<li>.NET might never be implemented on some platforms, especially Mac and embedded variants of Linux.
296<li>wxPython and other language variants provide further reasons for wxWindows to continue.
297<li>The same issue exists for Qt: if Qt sales remain strong, it's a good indication that
298the market for a C++-based approach is still there. (Either that, or everyone's turning to wxWindows!)
299</ol>
300
301There is nothing to stop folk from developing a C&#35; version of the wxWindows API;
302we already have bindings to Python, Perl, JavaScript, Lua, Basic, and Eiffel.
303Update: a <a href="http://wxnet.sourceforge.net/" target=_new>wx.NET</a> project is now in progress.
304
305<P>
306
8b283bb8 307<H3><a name="help">How can I help the project?</a></H3>
b953bdc2 308
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309Please check out the <a href="http://www.wxwindows.org/develop2.htm">Community</a> pages,
310in particular the <a href="projects.htm">suggested projects</a>, and
2b5f62a0 311mail the developers&#39; mailing list with your own suggestions.<P>
b953bdc2 312
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