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  15 <b>wxWidgets 2 for Windows FAQ</b>
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  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 <ul>
  27 <li><a href="#platforms">Which Windows platforms are supported?</a></li>
  28 <li><a href="#wince">What about Windows CE?</a></li>
  29 <li><a href="#winxp">What do I need to do for Windows XP?</a></li>
  30 <li><a href="#compilers">What compilers are supported?</a></li>
  31 <li><a href="#bestcompiler">Which is the best compiler to use with wxWidgets 2?</a></li>
  32 <li><a href="#unicode">Is Unicode supported?</a></li>
  33 <li><a href="#doublebyte">Does wxWidgets support double byte fonts (Chinese/Japanese/Korean etc.)?</a></li>
  34 <li><a href="#dll">Can you compile wxWidgets 2 as a DLL?</a></li>
  35 <li><a href="#exesize">How can I reduce executable size?</a></li>
  36 <li><a href="#mfc">Is wxWidgets compatible with MFC?</a></li>
  37 <li><a href="#setuph">Why do I get errors about setup.h not being found?</a></li>
  38 <li><a href="#asuffix">Why do I get errors about FooBarA when I only use FooBar in my program?</a></li>
  39 <li><a href="#newerrors">Why my code fails to compile with strange errors about new operator?</a></li>
  40 <li><a href="#mfcport">How do I port MFC applications to wxWidgets?</a></li>
  41 <li><a href="#crash">Why do I sometimes get bizarre crash problems using VC++ 5/6?</a></li>
  42 <li><a href="#makefiles">How are the wxWidgets makefiles edited under Windows?</a></li>
  43 <li><a href="#vcdebug">How do you use VC++&#39;s memory leak checking instead of that in wxWidgets?</a></li>
  44 <li><a href="#shortcutproblem">Why are menu hotkeys or shortcuts not working in my application?</a></li>
  45 <li><a href="#regconfig">Why can I not write to the HKLM part of the registry with wxRegConfig?</a></li>
  46 <li><a href="#access">Is MS Active Accessibility supported?</a></li>
  47 <li><a href="#dspfmt">Why does Visual C++ complain about corrupted project files??</a></li>
  48 <li><a href="#crtmismatch">Visual C++ gives errors about multiply defined symbols, what can I do?</a></li>
  49 </ul>
  50 <hr>
  51
  52 <h3><a name="platforms">Which Windows platforms are supported?</a></h3>
  53
  54 wxWidgets 2 can be used to develop and deliver applications on Windows 3.1, Win32s,
  55 Windows 95, Windows 98, Windows NT, Windows 2000, and Windows XP. A Windows CE
  56 version is being looked into (see below).<P>
  57
  58 wxWidgets 2 is designed to make use of WIN32 features and controls. However, unlike Microsoft,
  59 we have not forgotten users of 16-bit Windows. Most features
  60 work under Windows 3.1, including wxTreeCtrl and wxListCtrl using the generic implementation.
  61 However, don&#39;t expect very Windows-95-specific classes to work, such as wxTaskBarIcon. The wxRegConfig
  62 class doesn&#39;t work either because the Windows 3.1 registry is very simplistic. Check out the 16-bit
  63 makefiles to see what other files have been left out.
  64 <P>
  65 16-bit compilation is supported under Visual C++ 1.5, and Borland BC++ 4 to 5.
  66 <P>
  67
  68 wxWidgets 2 for Windows will also compile on Unix with gcc using Wine from <a href="http://www.winehq.org" target=_top>WineHQ</a>.
  69 The resulting executables are Unix binaries that work with the Wine Windows API emulator.<P>
  70
  71 You can also compile wxWidgets 2 for Windows on Unix with Cygwin or Mingw32, resulting
  72 in executables that will run on Windows. So in theory you could write your applications
  73 using wxGTK or wxMotif, then check/debug your wxWidgets for Windows
  74 programs with Wine, and finally produce an ix86 Windows executable using Cygwin/Mingw32,
  75 without ever needing a copy of Microsoft Windows. See the Technical Note on the Web site detailing cross-compilation.<P>
  76
  77 <h3><a name="wince">What about Windows CE?</a></h3>
  78
  79 This port is largely complete. For further information, see the <a href="http://www.wxwidgets.org/embedded.htm#wxwince">wxEmbedded</a> page.<P>
  80
  81 <h3><a name="winxp">What do I need to do for Windows XP?</a></h3>
  82
  83 In the same directory as you have your executable (e.g. foo.exe) you
  84 put a file called foo.exe.manifest in which you have something like
  85 the following:
  86
  87 <pre>
  88 &lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?&gt;
  89 &lt;assembly
  90    xmlns="urn:schemas-microsoft-com:asm.v1"
  91    manifestVersion="1.0"&gt;
  92 &lt;assemblyIdentity
  93     processorArchitecture="x86"
  94     version="5.1.0.0"
  95     type="win32"
  96     name="foo.exe"/&gt;
  97     &lt;description&gt;Foo program&lt;/description&gt;
  98     &lt;dependency&gt;
  99     &lt;dependentAssembly&gt;
 100     &lt;assemblyIdentity
 101          type="win32"
 102          name="Microsoft.Windows.Common-Controls"
 103          version="6.0.0.0"
 104          publicKeyToken="6595b64144ccf1df"
 105          language="*"
 106          processorArchitecture="x86"/&gt;
 107     &lt;/dependentAssembly&gt;
 108     &lt;/dependency&gt;
 109 &lt;/assembly&gt;
 110 </pre>
 111
 112 If you want to add it to your application permanently,
 113 you can also include it in your .rc file using this
 114 line:<P>
 115
 116 <PRE>
 117   1 24 "winxp.manifest"
 118 </PRE>
 119
 120 In wxWidgets 2.5, this will be in the wx/msw/wx.rc and
 121 so will happen automatically so long as you include wx.rc
 122 in your own .rc file.<P>
 123
 124 For an explanation of this syntax, please see
 125 <a href="http://delphi.about.com/library/bluc/text/uc111601a.htm" target=_new>this
 126 article</a>.
 127 <P>
 128
 129 <h3><a name="compilers">What compilers are supported?</a></h3>
 130
 131 Please see the wxWidgets 2 for Windows install.txt file for up-to-date information, but
 132 currently the following are known to work:<P>
 133
 134 <ul>
 135 <li>Visual C++ 1.5, 4.0, 5.0, 6.0, 7.0, 7.1
 136 <li>Borland C++ 4.5, 5.0, 5.5
 137 <li>Borland C++Builder 1.0, 3.0, X
 138 <li>Watcom C++ 10.6 (Win32), OpenWatcom 1.0
 139 <li>Cygwin (using configure)
 140 <li>Mingw32
 141 <li>MetroWerks CodeWarrior (many versions)
 142 <li>Digital Mars 8.34+
 143 </ul>
 144 <P>
 145
 146
 147 <h3><a name="bestcompiler">Which is the best compiler to use with wxWidgets 2?</a></h3>
 148
 149 It&#39;s partly a matter of taste, but I (JACS) prefer Visual C++ since the debugger is very
 150 good, it&#39;s very stable, the documentation is extensive, and it generates small executables.
 151 Since project files are plain text, it&#39;s easy for me to generate appropriate project files
 152 for wxWidgets samples.<P>
 153
 154 Borland C++ is fine - and very fast - but it&#39;s hard (impossible?) to use the debugger without using project files, and
 155 the debugger is nowhere near up to VC++&#39;s quality. The IDE isn&#39;t great.<P>
 156
 157 C++Builder&#39;s power isn&#39;t really used with wxWidgets since it needs integration with its
 158 own class library (VCL). For wxWidgets, I&#39;ve only used it with makefiles, in which case
 159 it&#39;s almost identical to BC++ 5.0 (the same makefiles can be used).<P>
 160
 161 You can&#39;t beat Cygwin&#39;s price (free), and you can debug adequately using gdb. However, it&#39;s
 162 quite slow to compile since it does not use precompiled headers.<P>
 163
 164 CodeWarrior is cross-platform - you can debug and generate Windows executables from a Mac, but not
 165 the other way around I think - but the IDE is, to my mind, a bit primitive.<P>
 166
 167 Watcom C++ is a little slow and the debugger is not really up to today&#39;s standards.<P>
 168
 169 Among the free compilers the best choice seem to be Borland C++ command line
 170 tools and mingw32 (port of gcc to Win32). Both of them are supported by
 171 wxWidgets.
 172
 173 <h3><a name="unicode">Is Unicode supported?</a></h3>
 174
 175 Yes, Unicode is fully supported under Windows NT/2000 and there is limited
 176 support for it under Windows 9x using <a
 177 href="http://www.microsoft.com/globaldev/handson/dev/mslu_announce.mspx">MSLU</a>.
 178 <p>
 179
 180 <h3><a name="doublebyte">Does wxWidgets support double byte fonts (Chinese/Japanese/Korean etc.)?</a></h3>
 181
 182 For Japanese under Win2000, it seems that wxWidgets has no problems to work
 183 with double byte char sets (meaning DBCS, not Unicode). First you have to
 184 install Japanese support on your Win2K system and choose for ANSI translation
 185 <tt>HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\CodePage=932</tt>
 186 (default is 1252 for Western). Then you can see all the Japanese letters in
 187 wxWidgets applications.
 188 <p>
 189
 190 <h3><a name="dll">Can you compile wxWidgets 2 as a DLL?</a></h3>
 191
 192 Yes (using the Visual C++ or Borland C++ makefile), but be aware that distributing DLLs is a thorny issue
 193 and you may be better off compiling statically-linked applications, unless you&#39;re
 194 delivering a suite of separate programs, or you&#39;re compiling a lot of wxWidgets applications
 195 and have limited hard disk space.<P>
 196
 197 With a DLL approach, and with different versions and configurations of wxWidgets
 198 needing to be catered for, the end user may end up with a host of large DLLs in his or her Windows system directory,
 199 negating the point of using DLLs. Of course, this is not a problem just associated with
 200 wxWidgets!
 201 <P>
 202
 203 <h3><a name="exesize">How can I reduce executable size?</a></h3>
 204
 205 You can compile wxWidgets as a DLL (see above, VC++/BC++ only at present). You should also
 206 compile your programs for release using non-debugging and space-optimisation options, but
 207 take with VC++ 5/6 space optimisation: it can sometimes cause problems.<P>
 208
 209 If you want to distribute really small executables, you can
 210 use <a href="http://www.un4seen.com/petite/" target=_top>Petite</a>
 211 by Ian Luck. This nifty utility compresses Windows executables by around 50%, so your 500KB executable
 212 will shrink to a mere 250KB. With this sort of size, there is reduced incentive to
 213 use DLLs. Another good compression tool (probably better than Petite) is <a href="http://upx.sourceforge.net/" target=_top>UPX</a>.
 214 <P>
 215
 216 Please do not be surprised if MinGW produces a statically-linked minimal executable of 1 MB. Firstly, gcc
 217 produces larger executables than some compilers. Secondly, this figure will
 218 include most of the overhead of wxWidgets, so as your application becomes more
 219 complex, the overhead becomes proportionally less significant. And thirdly, trading executable compactness
 220 for the enormous increase in productivity you get with wxWidgets is almost always well worth it.<P>
 221
 222 If you have a really large executable compiled with MinGW (for example 20MB) then
 223 you need to configure wxWidgets to compile without debugging information: see
 224 docs/msw/install.txt for details. You may find that using configure instead
 225 of makefile.g95 is easier, particularly since you can maintain debug and
 226 release versions of the library simultaneously, in different directories.
 227 Also, run 'strip' after linking to remove all traces of debug info.
 228 <P>
 229
 230 <H3><a name="mfc">Is wxWidgets compatible with MFC?</a></H3>
 231
 232 There is a sample which demonstrates MFC and wxWidgets code co-existing in the same
 233 application. However, don&#39;t expect to be able to enable wxWidgets windows with OLE-2
 234 functionality using MFC.<P>
 235
 236 <H3><a name="setuph">Why do I get errors about setup.h not being found?</a></H3>
 237
 238 When you build the wxWidgets library, setup.h is copied
 239 from include/wx/msw/setup.h to e.g. lib/mswd/wx/setup.h (the path
 240 depends on the configuration you&#39;re building). So you need to add
 241 this include path if building using the static Debug library:<P>
 242
 243 lib/mswd<P>
 244
 245 or if building the static Release library, lib/msw.<P>
 246
 247 See also the <a href="http://wiki.wxwidgets.org/wiki.pl?Table_Of_Contents">wxWiki Contents</a>
 248 for more information.<P>
 249
 250
 251 <H3><a name="asuffix">Why do I get errors about FooBarA when I only use FooBar in my program?</H3>
 252
 253 If you get errors like
 254 <p>
 255 <center>
 256 <tt>no matching function for call to &#39;wxDC::DrawTextA(const char[5], int,
 257 int)&#39;</tt>
 258 </center>
 259 <p>
 260 or similar ones for the other functions, i.e. the compiler error messages
 261 mention the function with the <tt>&#39;A&#39;</tt> suffix while you didn&#39;t
 262 use it in your code, the explanation is that you had included
 263 <tt>&#60;windows.h&#062;</tt> header which redefines many symbols to have such
 264 suffix (or <tt>&#39;W&#39;</tt> in the Unicode builds).
 265
 266 <p>
 267 The fix is to either not include <tt>&#60;windows.h&#62;</tt> at all or include
 268 <tt>"wx/msw/winundef.h"</tt> immediately after it.
 269
 270 <H3><a name="newerrors">Why my code fails to compile with strange errors about new operator?</a></H3>
 271
 272 The most common cause of this problem is the memory debugging settings in
 273 <tt>wx/msw/setup.h</tt>. You have several choices:
 274
 275 <ul>
 276     <li> Either disable overloading the global operator new completely by
 277          setting <tt>wxUSE_GLOBAL_MEMORY_OPERATORS</tt> and
 278          <tt>wxUSE_DEBUG_NEW_ALWAYS</tt> to 0 in this file
 279     <li> Or leave them on but do <tt>#undef new</tt> after including any
 280          wxWidgets headers, like this the memory debugging will be still on
 281          for wxWidgets sources but off for your own code
 282 </ul>
 283
 284 Notice that IMHO the first solution is preferable for VC++ users who can use
 285 the <a href="#vcdebug">VC++ CRT memory debugging features</a> instead.
 286
 287 <H3><a name="mfcport">How do I port MFC applications to wxWidgets?</a></H3>
 288
 289 Set up your interface from scratch using wxWidgets (especially <a href="http://www.robeling.de" target=_top>wxDesigner</a>
 290 or <a href="http://www.anthemion.co.uk/dialogblocks/" target=_new>DialogBlocks</a> --
 291 it&#39;ll save you a <i>lot</i> of time) and when you have a shell prepared, you can start
 292 &#39;pouring in&#39; code from the MFC app, with appropriate
 293 modifications. This is the approach I have used, and I found
 294 it very satisfactory. A two-step process then - reproduce the bare
 295 interface first, then wire it up afterwards. That way you deal
 296 with each area of complexity separately. Don&#39;t try to think MFC
 297 and wxWidgets simultaneously from the beginning - it is easier to
 298 reproduce the initial UI by looking at the behaviour of the MFC
 299 app, not its code.
 300
 301 <H3><a name="crash">Why do I sometimes get bizarre crash problems using VC++ 5/6?</a></H3>
 302
 303 Some crash problems can be due to inconsistent compiler
 304 options (and of course this isn&#39;t limited to wxWidgets).
 305 If strange/weird/impossible things start to happen please
 306 check (dumping IDE project file as makefile and doing text comparison
 307 if necessary) that the project settings, especially the list of defined
 308 symbols, struct packing, etc. are exactly the same for all items in
 309 the project. After this, delete everything (including PCH) and recompile.<P>
 310
 311 VC++ 5&#39;s optimization code seems to be broken and can
 312 cause problems: this can be seen when deleting an object Dialog
 313 Editor, in Release mode with optimizations on. If in doubt,
 314 switch off optimisations, although this will result in much
 315 larger executables. It seems possible that the library can be created with
 316 strong optimization, so long as the application is not strongly
 317 optimized. For example, in wxWidgets project, set to &#39;Minimum
 318 Size&#39;. In Dialog Editor project, set to &#39;Customize: Favor Small
 319 Code&#39; (and no others). This will then work.<P>
 320
 321 <H3><a name="makefiles">How are the wxWidgets makefiles edited under Windows?</a></H3>
 322
 323 As of wxWidgets 2.1, there is a new system written by Vadim Zeitlin, that
 324 generates the makefiles from templates using tmake.<P>
 325
 326 Here are Vadim&#39;s notes:<P>
 327
 328 <blockquote>
 329 To use these new makefiles, you don&#39;t need anything (but see below).
 330 However, you should NOT modify them because these files will be
 331 rewritten when I regenerate them using tmake the next time. So, if
 332 you find a problem with any of these makefiles (say, makefile.b32)
 333 you&#39;ll need to modify the corresponding template (b32.t in this
 334 example) and regenerate the makefile using tmake.<P>
 335
 336 tmake can be found at
 337 <a href="http://www.troll.no/freebies/tmake.html" target=_new>www.troll.no/freebies/tmake.html</a>.
 338 It&#39;s a Perl5 program and so it needs Perl (doh). There is a binary for
 339 Windows (available from the same page), but I haven&#39;t used it, so
 340 I don&#39;t know if it works as flawlessly as "perl tmake" does (note
 341 for people knowing Perl: don&#39;t try to run tmake with -w, it won&#39;t
 342 do you any good). Using it extremely simple: to regenerate makefile.b32
 343 just go to distrib/msw/tmake and type<P>
 344
 345 <pre>tmake -t b32 wxwin.pro -o ../../src/msw/makefile.b32</pre><P>
 346
 347 The makefiles are untested - I don&#39;t have any of Borland, Watcom or
 348 Symantec and I don&#39;t have enough diskspace to recompile even with
 349 VC6 using makefiles. The new makefiles are as close as possible to the
 350 old ones, but not closer: in fact, there has been many strange things
 351 (should I say bugs?) in some of makefiles, some files were not compiled
 352 without any reason etc. Please test them and notify me about any problems.
 353 Better yet, modify the template files to generate the correct makefiles
 354 and check them in.<P>
 355
 356 The templates are described in tmake ref manual (1-2 pages of text)
 357 and are quite simple. They do contain some Perl code, but my Perl is
 358 primitive (very C like) so it should be possible for anybody to make
 359 trivial modifications to it (I hope that only trivial modifications
 360 will be needed). I&#39;ve tagged the ol makefiles as MAKEFILES_WITHOUT_TMAKE
 361 in the cvs, so you can always retrieve them and compare the new ones,
 362 this will make it easier to solve the problems you might have.<P>
 363
 364 Another important file is filelist.txt: it contains the list of all
 365 files to be compiled. Some of them are only compiled in 16/32 bit mode.
 366 Some other are only compiled with some compilers (others can&#39;t compile
 367 them) - all this info is contained in this file.<P>
 368
 369 So now adding a new file to wxWidgets is as easy as modifying filelist.txt
 370 (and Makefile.ams for Unix ports) and regenerating the makefiles - no
 371 need to modify all files manually any more.<P>
 372
 373  Finally, there is also a file vc6.t which I use myself: this one
 374 generates a project file for VC++ 6.0 (I didn&#39;t create vc5.t because
 375 I don&#39;t need it and can&#39;t test it, but it should be trivial to create
 376 one from vc6.t - probably the only things to change would be the
 377 version number in the very beginning and the /Z option - VC5 doesn&#39;t
 378 support edit-and=continue). This is not an officially supported way
 379 of building wxWidgets (that is, nobody guarantees that it will work),
 380 but it has been very useful to me and I hope it will be also for
 381 others. To generate wxWidgets.dsp run<P>
 382
 383 <pre>tmake -t vc6 wxwin.pro -o ../../wxWidgets.dsp</pre><P>
 384
 385 Then just include this project in any workspace or open it from VC IDE
 386 and it will create a new workspace for you.<P>
 387
 388 If all goes well, I&#39;m planning to create a template file for Makefile.ams
 389 under src/gtk and src/motif and also replace all makefiles in the samples
 390 subdirectories with the project files from which all the others will be
 391 generated. At least it will divide the number of files in samples
 392 directory by 10 (and the number of files to be maintained too).
 393 </blockquote>
 394
 395 <P>
 396
 397 <H3><a name="vcdebug">How do you use VC++&#39;s memory leak checking instead of that in wxWidgets?</a></H3>
 398
 399 Vadim Zeitlin:
 400
 401 <pre>
 402 On the VC++ level, it&#39;s just the matter of calling _CrtSetDbgFlag() in the very
 403 beginning of the program. In wxWidgets, this is done automatically when
 404 compiling with VC++ in debug mode unless wxUSE_GLOBAL_MEMORY_OPERATORS or
 405 __NO_VC_CRTDBG__ are defined - this check is done in wx/msw/msvcrt.h which
 406 is included from app.cpp which then calls wxCrtSetDbgFlag() without any
 407 ifdefs.
 408
 409 This works quite well: at the end of the program, all leaked blocks with their
 410 malloc count are shown. This number (malloc count) can be used to determine
 411 where exactly the object was allocated: for this it&#39;s enough to set the variable
 412 _crtBreakAlloc (look in VC98\crt\srs\dbgheap.c line 326) to this number and
 413 a breakpoint will be triggered when the block with this number is allocated.
 414
 415 For simple situations it works like a charm. For something more complicated
 416 like reading uninitialized memory a specialized tool is probably better...
 417
 418 Regards,
 419 VZ
 420 </pre>
 421
 422 <P>
 423
 424 <H3><a name="shortcutproblem">Why are menu hotkeys or shortcuts not working in my application?</a></H3>
 425
 426 This can happen if you have a child window intercepting EVT_CHAR events and swallowing
 427 all keyboard input. You should ensure that event.Skip() is called for all input that
 428 isn&#39;used by the event handler.<P>
 429
 430 It can also happen if you append the submenu to the parent
 431 menu {\it before} you have added your menu items. Do the append {\it after} adding
 432 your items, or accelerators may not be registered properly.<P>
 433
 434 <H3><a name="#regconfig">Why can I not write to the HKLM part of the registry with wxRegConfig?</a></H3>
 435
 436 Currently this is not possible because the wxConfig family of classes is
 437 supposed to deal with per-user application configuration data, and HKLM is
 438 only supposed to be writeable by a user with Administrator privileges. In theory,
 439 only installers should write to HKLM. This is still a point debated by the
 440 wxWidgets developers. There are at least two ways to work around it if you really
 441 need to write to HKLM.<P>
 442
 443 First, you can use wxRegKey directly, for example:
 444
 445 <pre>
 446     wxRegKey regKey;
 447
 448     wxString idName(wxT("HKEY_LOCAL_MACHINE\\SOFTWARE\\My Company\\My Product\\Stuff\\"));
 449     idName += packid;
 450
 451     regKey.SetName(idName);
 452
 453     {
 454         wxLogNull dummy;
 455         if (!regKey.Create())
 456         {
 457             idName = wxT("HKEY_CURRENT_USER\\SOFTWARE\\My Company\\My Product\\Stuff\\");
 458             idName += packid;
 459             regKey.SetName(idName);
 460             if (!regKey.Create())
 461                 return FALSE;
 462         }
 463     }
 464
 465     if (!regKey.SetValue(wxT("THING"), (long) thing)) err += 1;
 466
 467     regKey.Close();
 468
 469 </pre>
 470
 471 Or, you can employ this trick suggested by Istvan Kovacs:
 472
 473 <pre>
 474 class myGlobalConfig : public wxConfig
 475 {
 476     myGlobalConfig() :
 477         wxConfig ("myApp", "myCompany", "", "", wxCONFIG_USE_GLOBAL_FILE)
 478 {};
 479     bool Write(const wxString& key, const wxString& value);
 480 }
 481
 482 bool myGlobalConfig::Write (const wxString& key, const wxString& value)
 483 {
 484     wxString path = wxString ("SOFTWARE\\myCompany\\myApp\\") + wxPathOnly(key);
 485     wxString new_path = path.Replace ("/", "\\", true);
 486     wxString new_key = wxFileNameFromPath (key);
 487     LocalKey().SetName (wxRegKey::HKLM, path);
 488     return wxConfig::Write (new_key, value);
 489 }
 490 </pre>
 491
 492 <H3><a name="#access">Is MS Active Accessibility supported?</a></H3>
 493
 494 This is being worked on. Please see <a href="http://www.wxwidgets.org/access.htm">this page</a>
 495 for the current status.
 496
 497 <P>
 498
 499
 500 <h3><a name="#dspfmt">Why does Visual C++ complain about corrupted project files??</a></h3>
 501
 502 If you have downloaded the wxWidgets sources from the cvs using a Unix cvs
 503 client or downloaded a daily snapshot in <tt>.tar.gz</tt> format, it is likely
 504 that the project files have Unix line endings (LF) instead of the DOS ones (CR
 505 LF). However all versions of Visual C++ up to and including 7.1 can only open
 506 the files with the DOS line endings, so you must transform the files to this
 507 format using any of the thousands ways to do it.
 508 <p>
 509 Of course, another possibility is to always use only the Windows cvs client
 510 and to avoid this problem completely.
 511 <p>
 512
 513 <h3><a name="#crtmismatch">Visual C++ gives errors about multiply defined symbols, what can I do?</a></h3>
 514
 515 If you get errors like this
 516
 517 <pre>
 518 MSVCRTD.lib(MSVCRTD.dll) : error LNK2005: _xxxxxx already defined in LIBCD.lib(yyyyy.obj)
 519 </pre>
 520
 521 when linking your project, this means that you used different versions of CRT
 522 (C Run-Time) library for wxWindows (or possibly another library) and the main
 523 project. Visual C++ provides static or dynamic and multithread safe or not
 524 versions of CRT for each of debug and release builds, for a total of 8
 525 libraries. You can choose among them by going to the "Code generation"
 526 page/subitem of the "C++" tab/item in the project proprieties dialog in VC6/7.
 527 <p>
 528 To avoid problems, you <strong>must</strong> use the same one for all
 529 components of your project. wxWindows uses multithread safe DLL version of the
 530 CRT which is a good choice but may be problematic when distributing your
 531 applications if you don&#39;t include the CRT DLL in your installation -- in this
 532 case you may decide to switch to using a static CRT version. If you build with
 533 <tt>wxUSE_THREADS == 0</tt> you may also use the non MT-safe version as it is
 534 slightly smaller and faster.
 535 <p>
 536 But the most important thing is to use the <strong>same</strong> CRT setting for
 537 all components of your project.
 538
 539 </font>
 540
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 543 </HTML>