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  16 <b>wxWindows 2 for Windows FAQ</b>
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  21
  22 <P>
  23
  24 See also <a href="faq.htm">top-level FAQ page</a>.
  25 <hr>
  26 <h3>List of questions in this category</h3>
  27 <ul>
  28 <li><a href="#platforms">Which Windows platforms are supported?</a></li>
  29 <li><a href="#wince">What about Windows CE?</a></li>
  30 <li><a href="#winxp">What do I need to do for Windows XP?</a></li>
  31 <li><a href="#compilers">What compilers are supported?</a></li>
  32 <li><a href="#bestcompiler">Which is the best compiler to use with wxWindows 2?</a></li>
  33 <li><a href="#unicode">Is Unicode supported?</a></li>
  34 <li><a href="#doublebyte">Does wxWindows support double byte fonts (Chinese/Japanese/Korean etc.)?</a></li>
  35 <li><a href="#dll">Can you compile wxWindows 2 as a DLL?</a></li>
  36 <li><a href="#exesize">How can I reduce executable size?</a></li>
  37 <li><a href="#mfc">Is wxWindows compatible with MFC?</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 wxWindows?</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 wxWindows 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 wxWindows?</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 </ul>
  48 <hr>
  49
  50 <h3><a name="platforms">Which Windows platforms are supported?</a></h3>
  51
  52 wxWindows 2 can be used to develop and deliver applications on Windows 3.1, Win32s,
  53 Windows 95, Windows 98, Windows NT, Windows 2000, and Windows XP. A Windows CE
  54 version is being looked into (see below).<P>
  55
  56 wxWindows 2 is designed to make use of WIN32 features and controls. However, unlike Microsoft,
  57 we have not forgotten users of 16-bit Windows. Most features
  58 work under Windows 3.1, including wxTreeCtrl and wxListCtrl using the generic implementation.
  59 However, don&#39;t expect very Windows-95-specific classes to work, such as wxTaskBarIcon. The wxRegConfig
  60 class doesn&#39;t work either because the Windows 3.1 registry is very simplistic. Check out the 16-bit
  61 makefiles to see what other files have been left out.
  62 <P>
  63 16-bit compilation is supported under Visual C++ 1.5, and Borland BC++ 4 to 5.
  64 <P>
  65
  66 wxWindows 2 for Windows will also compile on Unix with gcc using TWIN32 from <a href="http://www.willows.com" target=_top>Willows</a>,
  67 although TWIN32 is still in a preliminary state. The resulting executables are
  68 Unix binaries that work with the TWIN32 Windows API emulator.<P>
  69
  70 You can also compile wxWindows 2 for Windows on Unix with Cygwin or Mingw32, resulting
  71 in executables that will run on Windows. So in theory you could write your applications
  72 using wxGTK or wxMotif, then check/debug your wxWindows for Windows
  73 programs with TWIN32, and finally produce an ix86 Windows executable using Cygwin/Mingw32,
  74 without ever needing a copy of Microsoft Windows. See the Technical Note on the Web site detailing cross-compilation.<P>
  75
  76 <h3><a name="wince">What about Windows CE?</a></h3>
  77
  78 This is under consideration, though we need to get wxWindows Unicode-aware first.
  79 There are other interesting issues, such as how to combine the menubar and toolbar APIs
  80 as Windows CE requires. But there&#39;s no doubt that it will be possible, albeit
  81 by mostly cutting down wxWindows 2 API functionality, and adding a few classes here
  82 and there. Since wxWindows for 2 produces small binaries (less than 300K for
  83 the statically-linked &#39;minimal&#39; sample), shoehorning wxWindows 2 into a Windows CE device&#39;s limited
  84 storage should not be a problem.<P>
  85
  86 <h3><a name="winxp">What do I need to do for Windows XP?</a></h3>
  87
  88 In the same directory as you have your executable (e.g. foo.exe) you
  89 put a file called foo.exe.manifest in which you have something like
  90 the following:
  91
  92 <pre>
  93 &lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?&gt;
  94 &lt;assembly
  95    xmlns="urn:schemas-microsoft-com:asm.v1"
  96    manifestVersion="1.0"&gt;
  97 &lt;assemblyIdentity
  98     processorArchitecture="x86"
  99     version="5.1.0.0"
 100     type="win32"
 101     name="foo.exe"/&gt;
 102     &lt;description&gt;Foo program&lt;/description&gt;
 103     &lt;dependency&gt;
 104     &lt;dependentAssembly&gt;
 105     &lt;assemblyIdentity
 106          type="win32"
 107          name="Microsoft.Windows.Common-Controls"
 108          version="6.0.0.0"
 109          publicKeyToken="6595b64144ccf1df"
 110          language="*"
 111          processorArchitecture="x86"/&gt;
 112     &lt;/dependentAssembly&gt;
 113     &lt;/dependency&gt;
 114 &lt;/assembly&gt;
 115 </pre>
 116
 117 If you want to add it to your application permanently,
 118 you can also include it in your .rc file using this
 119 line:<P>
 120
 121 <PRE>
 122   1 24 "winxp.manifest"
 123 </PRE>
 124
 125 In wxWindows 2.5, this will be in the wx/msw/wx.rc and
 126 so will happen automatically so long as you include wx.rc
 127 in your own .rc file.<P>
 128
 129 For an explanation of this syntax, please see
 130 <a href="http://delphi.about.com/library/bluc/text/uc111601a.htm" target=_new>this
 131 article</a>.
 132 <P>
 133
 134 <h3><a name="compilers">What compilers are supported?</a></h3>
 135
 136 Please see the wxWindows 2 for Windows install.txt file for up-to-date information, but
 137 currently the following are known to work:<P>
 138
 139 <ul>
 140 <li>Visual C++ 1.5, 4.0, 5.0, 6.0
 141 <li>Borland C++ 4.5, 5.0
 142 <li>Borland C++Builder 1.0, 3.0
 143 <li>Watcom C++ 10.6 (WIN32)
 144 <li>Cygwin b20
 145 <li>Mingw32
 146 <li>MetroWerks CodeWarrior 4
 147 </ul>
 148 <P>
 149
 150 There is a linking problem with Symantec C++ which I hope someone can help solve.
 151 <P>
 152
 153 <h3><a name="bestcompiler">Which is the best compiler to use with wxWindows 2?</a></h3>
 154
 155 It&#39;s partly a matter of taste, but I (JACS) prefer Visual C++ since the debugger is very
 156 good, it&#39;s very stable, the documentation is extensive, and it generates small executables.
 157 Since project files are plain text, it&#39;s easy for me to generate appropriate project files
 158 for wxWindows samples.<P>
 159
 160 Borland C++ is fine - and very fast - but it&#39;s hard (impossible?) to use the debugger without using project files, and
 161 the debugger is nowhere near up to VC++&#39;s quality. The IDE isn&#39;t great.<P>
 162
 163 C++Builder&#39;s power isn&#39;t really used with wxWindows since it needs integration with its
 164 own class library (VCL). For wxWindows, I&#39;ve only used it with makefiles, in which case
 165 it&#39;s almost identical to BC++ 5.0 (the same makefiles can be used).<P>
 166
 167 You can&#39;t beat Cygwin&#39;s price (free), and you can debug adequately using gdb. However, it&#39;s
 168 quite slow to compile since it does not use precompiled headers.<P>
 169
 170 CodeWarrior is cross-platform - you can debug and generate Windows executables from a Mac, but not
 171 the other way around I think - but the IDE is, to my mind, a bit primitive.<P>
 172
 173 Watcom C++ is a little slow and the debugger is not really up to today&#39;s standards.<P>
 174
 175 Among the free compilers the best choice seem to be Borland C++ command line
 176 tools and mingw32 (port of gcc to Win32). Both of them are supported by
 177 wxWindows.
 178
 179 <h3><a name="unicode">Is Unicode supported?</a></h3>
 180
 181 Yes, Unicode is fully supported under Windows NT/2000 (Windows 9x don&#39;t
 182 have Unicode support anyhow).
 183
 184 <h3><a name="doublebyte">Does wxWindows support double byte fonts (Chinese/Japanese/Korean etc.)?</a></h3>
 185
 186 An answer from <a href="mailto:goedde@logosoft.de">Klaus Goedde</a>:<p>
 187
 188 "For Japanese under Win2000, it seems that wxWindows has no problems to work with double byte char sets
 189 (I mean DBCS, that&#39;s not Unicode). First you have to install Japanese support on your Win2K system
 190 and choose for ANSI translation
 191 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\CodePage=932 (default is 1252 for Western).
 192 Then you can see all the funny Japanese letters under wxWindows too.<P>
 193
 194 In a wxTextCtrl control you have to set the window style "wxTE_RICH", otherwise this control shows the wrong
 195 letters.
 196
 197 I don&#39;t now whether it works on non W2K systems, because I&#39;m just starting using wxWindows."
 198 <P>
 199
 200 <h3><a name="dll">Can you compile wxWindows 2 as a DLL?</a></h3>
 201
 202 Yes (using the Visual C++ or Borland C++ makefile), but be aware that distributing DLLs is a thorny issue
 203 and you may be better off compiling statically-linked applications, unless you&#39;re
 204 delivering a suite of separate programs, or you&#39;re compiling a lot of wxWindows applications
 205 and have limited hard disk space.<P>
 206
 207 With a DLL approach, and with different versions and configurations of wxWindows
 208 needing to be catered for, the end user may end up with a host of large DLLs in his or her Windows system directory,
 209 negating the point of using DLLs. Of course, this is not a problem just associated with
 210 wxWindows!
 211 <P>
 212
 213 <h3><a name="exesize">How can I reduce executable size?</a></h3>
 214
 215 You can compile wxWindows as a DLL (see above, VC++/BC++ only at present). You should also
 216 compile your programs for release using non-debugging and space-optimisation options, but
 217 take with VC++ 5/6 space optimisation: it can sometimes cause problems.<P>
 218
 219 If you want to distribute really small executables, you can
 220 use <a href="http://www.un4seen.com/petite/" target=_top>Petite</a>
 221 by Ian Luck. This nifty utility compresses Windows executables by around 50%, so your 500KB executable
 222 will shrink to a mere 250KB. With this sort of size, there is reduced incentive to
 223 use DLLs. Another good compression tool (probably better than Petite) is <a href="http://upx.sourceforge.net/" target=_top>UPX</a>.
 224 <P>
 225
 226 Please do not be surprised if MinGW produces a statically-linked minimal executable of 1 MB. Firstly, gcc
 227 produces larger executables than some compilers. Secondly, this figure will
 228 include most of the overhead of wxWindows, so as your application becomes more
 229 complex, the overhead becomes proportionally less significant. And thirdly, trading executable compactness
 230 for the enormous increase in productivity you get with wxWindows is almost always well worth it.<P>
 231
 232 If you have a really large executable compiled with MinGW (for example 20MB) then
 233 you need to configure wxWindows to compile without debugging information: see
 234 docs/msw/install.txt for details. You may find that using configure instead
 235 of makefile.g95 is easier, particularly since you can maintain debug and
 236 release versions of the library simultaneously, in different directories.
 237 Also, run 'strip' after linking to remove all traces of debug info.
 238 <P>
 239
 240 <H3><a name="mfc">Is wxWindows compatible with MFC?</a></H3>
 241
 242 There is a sample which demonstrates MFC and wxWindows code co-existing in the same
 243 application. However, don&#39;t expect to be able to enable wxWindows windows with OLE-2
 244 functionality using MFC.<P>
 245
 246 <H3><a name="asuffix">Why do I get errors about FooBarA when I only use FooBar in my program?</H3>
 247
 248 If you get errors like
 249 <p>
 250 <center>
 251 <tt>no matching function for call to &#39;wxDC::DrawTextA(const char[5], int,
 252 int)&#39;</tt>
 253 </center>
 254 <p>
 255 or similar ones for the other functions, i.e. the compiler error messages
 256 mention the function with the <tt>&#39;A&#39;</tt> suffix while you didn&#39;t
 257 use it in your code, the explanation is that you had included
 258 <tt>&#60;windows.h&#062;</tt> header which redefines many symbols to have such
 259 suffix (or <tt>&#39;W&#39;</tt> in the Unicode builds).
 260
 261 <p>
 262 The fix is to either not include <tt>&#60;windows.h&#62;</tt> at all or include
 263 <tt>"wx/msw/winundef.h"</tt> immediately after it.
 264
 265 <H3><a name="newerrors">Why my code fails to compile with strange errors about new operator?</a></H3>
 266
 267 The most common cause of this problem is the memory debugging settings in
 268 <tt>wx/msw/setup.h</tt>. You have several choices:
 269
 270 <ul>
 271     <li> Either disable overloading the global operator new completely by
 272          setting <tt>wxUSE_GLOBAL_MEMORY_OPERATORS</tt> and
 273          <tt>wxUSE_DEBUG_NEW_ALWAYS</tt> to 0 in this file
 274     <li> Or leave them on but do <tt>#undef new</tt> after including any
 275          wxWindows headers, like this the memory debugging will be still on
 276          for wxWindows sources but off for your own code
 277 </ul>
 278
 279 Notice that IMHO the first solution is preferable for VC++ users who can use
 280 the <a href="#vcdebug">VC++ CRT memory debugging features</a> instead.
 281
 282 <H3><a name="mfcport">How do I port MFC applications to wxWindows?</a></H3>
 283
 284 Set up your interface from scratch using wxWindows (especially wxDesigner --
 285 it&#39;ll save you a <i>lot</i> of time) and when you have a shell prepared, you can start
 286 &#39;pouring in&#39; code from the MFC app, with appropriate
 287 modifications. This is the approach I have used, and I found
 288 it very satisfactory. A two-step process then - reproduce the bare
 289 interface first, then wire it up afterwards. That way you deal
 290 with each area of complexity separately. Don&#39;t try to think MFC
 291 and wxWindows simultaneously from the beginning - it is easier to
 292 reproduce the initial UI by looking at the behaviour of the MFC
 293 app, not its code.
 294
 295 <H3><a name="crash">Why do I sometimes get bizarre crash problems using VC++ 5/6?</a></H3>
 296
 297 Some crash problems can be due to inconsistent compiler
 298 options (and of course this isn&#39;t limited to wxWindows).
 299 If strange/weird/impossible things start to happen please
 300 check (dumping IDE project file as makefile and doing text comparison
 301 if necessary) that the project settings, especially the list of defined
 302 symbols, struct packing, etc. are exactly the same for all items in
 303 the project. After this, delete everything (including PCH) and recompile.<P>
 304
 305 VC++ 5&#39;s optimization code seems to be broken and can
 306 cause problems: this can be seen when deleting an object Dialog
 307 Editor, in Release mode with optimizations on. If in doubt,
 308 switch off optimisations, although this will result in much
 309 larger executables. It seems possible that the library can be created with
 310 strong optimization, so long as the application is not strongly
 311 optimized. For example, in wxWindows project, set to &#39;Minimum
 312 Size&#39;. In Dialog Editor project, set to &#39;Customize: Favor Small
 313 Code&#39; (and no others). This will then work.<P>
 314
 315 <H3><a name="makefiles">How are the wxWindows makefiles edited under Windows?</a></H3>
 316
 317 As of wxWindows 2.1, there is a new system written by Vadim Zeitlin, that
 318 generates the makefiles from templates using tmake.<P>
 319
 320 Here are Vadim&#39;s notes:<P>
 321
 322 <blockquote>
 323 To use these new makefiles, you don&#39;t need anything (but see below).
 324 However, you should NOT modify them because these files will be
 325 rewritten when I regenerate them using tmake the next time. So, if
 326 you find a problem with any of these makefiles (say, makefile.b32)
 327 you&#39;ll need to modify the corresponding template (b32.t in this
 328 example) and regenerate the makefile using tmake.<P>
 329
 330 tmake can be found at
 331 <a href="http://www.troll.no/freebies/tmake.html" target=_new>www.troll.no/freebies/tmake.html</a>.
 332 It&#39;s a Perl5 program and so it needs Perl (doh). There is a binary for
 333 Windows (available from the same page), but I haven&#39;t used it, so
 334 I don&#39;t know if it works as flawlessly as "perl tmake" does (note
 335 for people knowing Perl: don&#39;t try to run tmake with -w, it won&#39;t
 336 do you any good). Using it extremely simple: to regenerate makefile.b32
 337 just go to distrib/msw/tmake and type<P>
 338
 339 <pre>tmake -t b32 wxwin.pro -o ../../src/msw/makefile.b32</pre><P>
 340
 341 The makefiles are untested - I don&#39;t have any of Borland, Watcom  or
 342 Symantec and I don&#39;t have enough diskspace to recompile even with
 343 VC6 using makefiles. The new makefiles are as close as possible to the
 344 old ones, but not closer: in fact, there has been many strange things
 345 (should I say bugs?) in some of makefiles, some files were not compiled
 346 without any reason etc. Please test them and notify me about any problems.
 347 Better yet, modify the template files to generate the correct makefiles
 348 and check them in.<P>
 349
 350 The templates are described in tmake ref manual (1-2 pages of text)
 351 and are quite simple. They do contain some Perl code, but my Perl is
 352 primitive (very C like) so it should be possible for anybody to make
 353 trivial modifications to it (I hope that only trivial modifications
 354 will be needed). I&#39;ve tagged the ol makefiles as MAKEFILES_WITHOUT_TMAKE
 355 in the cvs, so you can always retrieve them and compare the new ones,
 356 this will make it easier to solve the problems you might have.<P>
 357
 358 Another important file is filelist.txt: it contains the list of all
 359 files to be compiled. Some of them are only compiled in 16/32 bit mode.
 360 Some other are only compiled with some compilers (others can&#39;t compile
 361 them) - all this info is contained in this file.<P>
 362
 363 So now adding a new file to wxWindows is as easy as modifying filelist.txt
 364 (and Makefile.ams for Unix ports) and regenerating the makefiles - no
 365 need to modify all files manually any more.<P>
 366
 367  Finally, there is also a file vc6.t which I use myself: this one
 368 generates a project file for VC++ 6.0 (I didn&#39;t create vc5.t because
 369 I don&#39;t need it and can&#39;t test it, but it should be trivial to create
 370 one from vc6.t - probably the only things to change would be the
 371 version number in the very beginning and the /Z option - VC5 doesn&#39;t
 372 support edit-and=continue). This is not an officially supported way
 373 of building wxWindows (that is, nobody guarantees that it will work),
 374 but it has been very useful to me and I hope it will be also for
 375 others. To generate wxWindows.dsp run<P>
 376
 377 <pre>tmake -t vc6 wxwin.pro -o ../../wxWindows.dsp</pre><P>
 378
 379 Then just include this project in any workspace or open it from VC IDE
 380 and it will create a new workspace for you.<P>
 381
 382 If all goes well, I&#39;m planning to create a template file for Makefile.ams
 383 under src/gtk and src/motif and also replace all makefiles in the samples
 384 subdirectories with the project files from which all the others will be
 385 generated. At least it will divide the number of files in samples
 386 directory by 10 (and the number of files to be maintained too).
 387 </blockquote>
 388
 389 <P>
 390
 391 <H3><a name="vcdebug">How do you use VC++&#39;s memory leak checking instead of that in wxWindows?</a></H3>
 392
 393 Vadim Zeitlin:
 394
 395 <pre>
 396 On the VC++ level, it&#39;s just the matter of calling _CrtSetDbgFlag() in the very
 397 beginning of the program. In wxWindows, this is done automatically when
 398 compiling with VC++ in debug mode unless wxUSE_GLOBAL_MEMORY_OPERATORS or
 399 __NO_VC_CRTDBG__ are defined - this check is done in wx/msw/msvcrt.h which
 400 is included from app.cpp which then calls wxCrtSetDbgFlag() without any
 401 ifdefs.
 402
 403 This works quite well: at the end of the program, all leaked blocks with their
 404 malloc count are shown. This number (malloc count) can be used to determine
 405 where exactly the object was allocated: for this it&#39;s enough to set the variable
 406 _crtBreakAlloc (look in VC98\crt\srs\dbgheap.c line 326) to this number and
 407 a breakpoint will be triggered when the block with this number is allocated.
 408
 409 For simple situations it works like a charm. For something more complicated
 410 like reading uninitialized memory a specialized tool is probably better...
 411
 412 Regards,
 413 VZ
 414 </pre>
 415
 416 <P>
 417
 418 <H3><a name="shortcutproblem">Why are menu hotkeys or shortcuts not working in my application?</a></H3>
 419
 420 This can happen if you have a child window intercepting EVT_CHAR events and swallowing
 421 all keyboard input. You should ensure that event.Skip() is called for all input that
 422 isn&#39;used by the event handler.<P>
 423
 424 It can also happen if you append the submenu to the parent
 425 menu {\it before} you have added your menu items. Do the append {\it after} adding
 426 your items, or accelerators may not be registered properly.<P>
 427
 428 <H3><a name="#regconfig">Why can I not write to the HKLM part of the registry with wxRegConfig?</a></H3>
 429
 430 Currently this is not possible because the wxConfig family of classes is
 431 supposed to deal with per-user application configuration data, and HKLM is
 432 only supposed to be writeable by a user with Administrator privileges. In theory,
 433 only installers should write to HKLM. This is still a point debated by the
 434 wxWindows developers. There are at least two ways to work around it if you really
 435 need to write to HKLM.<P>
 436
 437 First, you can use wxRegKey directly, for example:
 438
 439 <pre>
 440     wxRegKey regKey;
 441
 442     wxString idName(wxT("HKEY_LOCAL_MACHINE\\SOFTWARE\\My Company\\My Product\\Stuff\\"));
 443     idName += packid;
 444
 445     regKey.SetName(idName);
 446
 447     {
 448         wxLogNull dummy;
 449         if (!regKey.Create())
 450         {
 451             idName = wxT("HKEY_CURRENT_USER\\SOFTWARE\\My Company\\My Product\\Stuff\\");
 452             idName += packid;
 453             regKey.SetName(idName);
 454             if (!regKey.Create())
 455                 return FALSE;
 456         }
 457     }
 458
 459     if (!regKey.SetValue(wxT("THING"), (long) thing)) err += 1;
 460
 461     regKey.Close();
 462
 463 </pre>
 464
 465 Or, you can employ this trick suggested by Istvan Kovacs:
 466
 467 <pre>
 468 class myGlobalConfig : public wxConfig
 469 {
 470     myGlobalConfig() :
 471         wxConfig ("myApp", "myCompany", "", "", wxCONFIG_USE_GLOBAL_FILE)
 472 {};
 473     bool Write(const wxString& key, const wxString& value);
 474 }
 475
 476 bool myGlobalConfig::Write (const wxString& key, const wxString& value)
 477 {
 478     wxString path = wxString ("SOFTWARE\\myCompany\\myApp\\") + wxPathOnly(key);
 479     wxString new_path = path.Replace ("/", "\\", true);
 480     wxString new_key = wxFileNameFromPath (key);
 481     LocalKey().SetName (wxRegKey::HKLM, path);
 482     return wxConfig::Write (new_key, value);
 483 }
 484 </pre>
 485
 486 <H3><a name="#access">Is MS Active Accessibility supported?</a></H3>
 487
 488 This is being worked on. Please see <a href="http://www.wxwindows.org/access.htm">this page</a>
 489 for the current status.
 490
 491 <P>
 492
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