src/common/appbase.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        common/base/appbase.cpp
   3 // Purpose:     implements wxAppConsole class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     19.06.2003 (extracted from common/appcmn.cpp)
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
   9 // License:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // for compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/app.h"
  29     #include "wx/intl.h"
  30     #include "wx/list.h"
  31     #include "wx/log.h"
  32 #endif //WX_PRECOMP
  33
  34 #include "wx/utils.h"
  35 #include "wx/apptrait.h"
  36 #include "wx/cmdline.h"
  37 #include "wx/confbase.h"
  38 #include "wx/filename.h"
  39 #include "wx/msgout.h"
  40 #include "wx/tokenzr.h"
  41
  42 #if !defined(__WXMSW__) || defined(__WXMICROWIN__)
  43   #include  <signal.h>      // for SIGTRAP used by wxTrap()
  44 #endif  //Win/Unix
  45
  46 #if defined(__WXMSW__)
  47   #include  "wx/msw/wrapwin.h"  // includes windows.h for MessageBox()
  48 #endif
  49
  50 #if wxUSE_FONTMAP
  51     #include "wx/fontmap.h"
  52 #endif // wxUSE_FONTMAP
  53
  54 #if defined(__DARWIN__) && defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
  55     // For MacTypes.h for Debugger function
  56     #include <CoreFoundation/CFBase.h>
  57 #endif
  58
  59 #if defined(__WXMAC__)
  60     // VZ: MacTypes.h is enough under Mac OS X (where I could test it) but
  61     //     I don't know which headers are needed under earlier systems so
  62     //     include everything when in doubt
  63     #ifdef __DARWIN__
  64         #include  "MacTypes.h"
  65     #else
  66         #include  "wx/mac/private.h"  // includes mac headers
  67     #endif
  68 #endif // __WXMAC__
  69
  70 #ifdef __WXDEBUG__
  71     #ifdef wxUSE_STACKWALKER
  72         #include "wx/stackwalk.h"
  73     #endif // wxUSE_STACKWALKER
  74 #endif // __WXDEBUG__
  75
  76 // ----------------------------------------------------------------------------
  77 // private functions prototypes
  78 // ----------------------------------------------------------------------------
  79
  80 #ifdef __WXDEBUG__
  81     // really just show the assert dialog
  82     static bool DoShowAssertDialog(const wxString& msg);
  83
  84     // prepare for showing the assert dialog, use the given traits or
  85     // DoShowAssertDialog() as last fallback to really show it
  86     static
  87     void ShowAssertDialog(const wxChar *szFile,
  88                           int nLine,
  89                           const wxChar *szCond,
  90                           const wxChar *szMsg,
  91                           wxAppTraits *traits = NULL);
  92
  93     // turn on the trace masks specified in the env variable WXTRACE
  94     static void LINKAGEMODE SetTraceMasks();
  95 #endif // __WXDEBUG__
  96
  97 // ----------------------------------------------------------------------------
  98 // global vars
  99 // ----------------------------------------------------------------------------
 100
 101 wxAppConsole *wxAppConsole::ms_appInstance = NULL;
 102
 103 wxAppInitializerFunction wxAppConsole::ms_appInitFn = NULL;
 104
 105 // ============================================================================
 106 // wxAppConsole implementation
 107 // ============================================================================
 108
 109 // ----------------------------------------------------------------------------
 110 // ctor/dtor
 111 // ----------------------------------------------------------------------------
 112
 113 wxAppConsole::wxAppConsole()
 114 {
 115     m_traits = NULL;
 116
 117     ms_appInstance = this;
 118
 119 #ifdef __WXDEBUG__
 120     SetTraceMasks();
 121 #if wxUSE_UNICODE
 122     // In unicode mode the SetTraceMasks call can cause an apptraits to be
 123     // created, but since we are still in the constructor the wrong kind will
 124     // be created for GUI apps.  Destroy it so it can be created again later.
 125     delete m_traits;
 126     m_traits = NULL;
 127 #endif
 128 #endif
 129 }
 130
 131 wxAppConsole::~wxAppConsole()
 132 {
 133     delete m_traits;
 134 }
 135
 136 // ----------------------------------------------------------------------------
 137 // initilization/cleanup
 138 // ----------------------------------------------------------------------------
 139
 140 bool wxAppConsole::Initialize(int& argc, wxChar **argv)
 141 {
 142 #if wxUSE_LOG
 143     // If some code logged something before wxApp instance was created,
 144     // wxLogStderr was set as the target. Undo it here by destroying the
 145     // current target. It will be re-created next time logging is needed, but
 146     // this time wxAppTraits will be used:
 147     delete wxLog::SetActiveTarget(NULL);
 148 #endif // wxUSE_LOG
 149
 150     // remember the command line arguments
 151     this->argc = argc;
 152     this->argv = argv;
 153
 154 #ifndef __WXPALMOS__
 155     if ( m_appName.empty() && argv )
 156     {
 157         // the application name is, by default, the name of its executable file
 158         wxFileName::SplitPath(argv[0], NULL, &m_appName, NULL);
 159     }
 160 #endif
 161
 162     return true;
 163 }
 164
 165 void wxAppConsole::CleanUp()
 166 {
 167 }
 168
 169 // ----------------------------------------------------------------------------
 170 // OnXXX() callbacks
 171 // ----------------------------------------------------------------------------
 172
 173 bool wxAppConsole::OnInit()
 174 {
 175 #if wxUSE_CMDLINE_PARSER
 176     wxCmdLineParser parser(argc, argv);
 177
 178     OnInitCmdLine(parser);
 179
 180     bool cont;
 181     switch ( parser.Parse(false /* don't show usage */) )
 182     {
 183         case -1:
 184             cont = OnCmdLineHelp(parser);
 185             break;
 186
 187         case 0:
 188             cont = OnCmdLineParsed(parser);
 189             break;
 190
 191         default:
 192             cont = OnCmdLineError(parser);
 193             break;
 194     }
 195
 196     if ( !cont )
 197         return false;
 198 #endif // wxUSE_CMDLINE_PARSER
 199
 200     return true;
 201 }
 202
 203 int wxAppConsole::OnExit()
 204 {
 205 #if wxUSE_CONFIG
 206     // delete the config object if any (don't use Get() here, but Set()
 207     // because Get() could create a new config object)
 208     delete wxConfigBase::Set((wxConfigBase *) NULL);
 209 #endif // wxUSE_CONFIG
 210
 211     // use Set(NULL) and not Get() to avoid creating a message output object on
 212     // demand when we just want to delete it
 213     delete wxMessageOutput::Set(NULL);
 214
 215     return 0;
 216 }
 217
 218 void wxAppConsole::Exit()
 219 {
 220     exit(-1);
 221 }
 222
 223 // ----------------------------------------------------------------------------
 224 // traits stuff
 225 // ----------------------------------------------------------------------------
 226
 227 wxAppTraits *wxAppConsole::CreateTraits()
 228 {
 229     return new wxConsoleAppTraits;
 230 }
 231
 232 wxAppTraits *wxAppConsole::GetTraits()
 233 {
 234     // FIXME-MT: protect this with a CS?
 235     if ( !m_traits )
 236     {
 237         m_traits = CreateTraits();
 238
 239         wxASSERT_MSG( m_traits, _T("wxApp::CreateTraits() failed?") );
 240     }
 241
 242     return m_traits;
 243 }
 244
 245 // we must implement CreateXXX() in wxApp itself for backwards compatibility
 246 #if WXWIN_COMPATIBILITY_2_4
 247
 248 #if wxUSE_LOG
 249
 250 wxLog *wxAppConsole::CreateLogTarget()
 251 {
 252     wxAppTraits *traits = GetTraits();
 253     return traits ? traits->CreateLogTarget() : NULL;
 254 }
 255
 256 #endif // wxUSE_LOG
 257
 258 wxMessageOutput *wxAppConsole::CreateMessageOutput()
 259 {
 260     wxAppTraits *traits = GetTraits();
 261     return traits ? traits->CreateMessageOutput() : NULL;
 262 }
 263
 264 #endif // WXWIN_COMPATIBILITY_2_4
 265
 266 // ----------------------------------------------------------------------------
 267 // event processing
 268 // ----------------------------------------------------------------------------
 269
 270 void wxAppConsole::ProcessPendingEvents()
 271 {
 272     // ensure that we're the only thread to modify the pending events list
 273     wxENTER_CRIT_SECT( *wxPendingEventsLocker );
 274
 275     if ( !wxPendingEvents )
 276     {
 277         wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
 278         return;
 279     }
 280
 281     // iterate until the list becomes empty
 282     wxList::compatibility_iterator node = wxPendingEvents->GetFirst();
 283     while (node)
 284     {
 285         wxEvtHandler *handler = (wxEvtHandler *)node->GetData();
 286         wxPendingEvents->Erase(node);
 287
 288         // In ProcessPendingEvents(), new handlers might be add
 289         // and we can safely leave the critical section here.
 290         wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
 291         handler->ProcessPendingEvents();
 292         wxENTER_CRIT_SECT( *wxPendingEventsLocker );
 293
 294         node = wxPendingEvents->GetFirst();
 295     }
 296
 297     wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
 298 }
 299
 300 int wxAppConsole::FilterEvent(wxEvent& WXUNUSED(event))
 301 {
 302     // process the events normally by default
 303     return -1;
 304 }
 305
 306 // ----------------------------------------------------------------------------
 307 // exception handling
 308 // ----------------------------------------------------------------------------
 309
 310 #if wxUSE_EXCEPTIONS
 311
 312 void
 313 wxAppConsole::HandleEvent(wxEvtHandler *handler,
 314                           wxEventFunction func,
 315                           wxEvent& event) const
 316 {
 317     // by default, simply call the handler
 318     (handler->*func)(event);
 319 }
 320
 321 bool
 322 wxAppConsole::OnExceptionInMainLoop()
 323 {
 324     throw;
 325
 326     // some compilers are too stupid to know that we never return after throw
 327 #if defined(__DMC__) || (defined(_MSC_VER) && _MSC_VER < 1200)
 328     return false;
 329 #endif
 330 }
 331
 332 #endif // wxUSE_EXCEPTIONS
 333
 334 // ----------------------------------------------------------------------------
 335 // cmd line parsing
 336 // ----------------------------------------------------------------------------
 337
 338 #if wxUSE_CMDLINE_PARSER
 339
 340 #define OPTION_VERBOSE _T("verbose")
 341
 342 void wxAppConsole::OnInitCmdLine(wxCmdLineParser& parser)
 343 {
 344     // the standard command line options
 345     static const wxCmdLineEntryDesc cmdLineDesc[] =
 346     {
 347         {
 348             wxCMD_LINE_SWITCH,
 349             _T("h"),
 350             _T("help"),
 351             gettext_noop("show this help message"),
 352             wxCMD_LINE_VAL_NONE,
 353             wxCMD_LINE_OPTION_HELP
 354         },
 355
 356 #if wxUSE_LOG
 357         {
 358             wxCMD_LINE_SWITCH,
 359             wxEmptyString,
 360             OPTION_VERBOSE,
 361             gettext_noop("generate verbose log messages"),
 362             wxCMD_LINE_VAL_NONE,
 363             0x0
 364         },
 365 #endif // wxUSE_LOG
 366
 367         // terminator
 368         {
 369             wxCMD_LINE_NONE,
 370             wxEmptyString,
 371             wxEmptyString,
 372             wxEmptyString,
 373             wxCMD_LINE_VAL_NONE,
 374             0x0
 375         }
 376     };
 377
 378     parser.SetDesc(cmdLineDesc);
 379 }
 380
 381 bool wxAppConsole::OnCmdLineParsed(wxCmdLineParser& parser)
 382 {
 383 #if wxUSE_LOG
 384     if ( parser.Found(OPTION_VERBOSE) )
 385     {
 386         wxLog::SetVerbose(true);
 387     }
 388 #else
 389     wxUnusedVar(parser);
 390 #endif // wxUSE_LOG
 391
 392     return true;
 393 }
 394
 395 bool wxAppConsole::OnCmdLineHelp(wxCmdLineParser& parser)
 396 {
 397     parser.Usage();
 398
 399     return false;
 400 }
 401
 402 bool wxAppConsole::OnCmdLineError(wxCmdLineParser& parser)
 403 {
 404     parser.Usage();
 405
 406     return false;
 407 }
 408
 409 #endif // wxUSE_CMDLINE_PARSER
 410
 411 // ----------------------------------------------------------------------------
 412 // debugging support
 413 // ----------------------------------------------------------------------------
 414
 415 /* static */
 416 bool wxAppConsole::CheckBuildOptions(const char *optionsSignature,
 417                                      const char *componentName)
 418 {
 419 #if 0 // can't use wxLogTrace, not up and running yet
 420     printf("checking build options object '%s' (ptr %p) in '%s'\n",
 421              optionsSignature, optionsSignature, componentName);
 422 #endif
 423
 424     if ( strcmp(optionsSignature, WX_BUILD_OPTIONS_SIGNATURE) != 0 )
 425     {
 426         wxString lib = wxString::FromAscii(WX_BUILD_OPTIONS_SIGNATURE);
 427         wxString prog = wxString::FromAscii(optionsSignature);
 428         wxString progName = wxString::FromAscii(componentName);
 429         wxString msg;
 430
 431         msg.Printf(_T("Mismatch between the program and library build versions detected.\nThe library used %s,\nand %s used %s."),
 432                    lib.c_str(), progName.c_str(), prog.c_str());
 433
 434         wxLogFatalError(msg.c_str());
 435
 436         // normally wxLogFatalError doesn't return
 437         return false;
 438     }
 439 #undef wxCMP
 440
 441     return true;
 442 }
 443
 444 #ifdef __WXDEBUG__
 445
 446 void wxAppConsole::OnAssert(const wxChar *file,
 447                             int line,
 448                             const wxChar *cond,
 449                             const wxChar *msg)
 450 {
 451     ShowAssertDialog(file, line, cond, msg, GetTraits());
 452 }
 453
 454 #endif // __WXDEBUG__
 455
 456 #if WXWIN_COMPATIBILITY_2_4
 457
 458 bool wxAppConsole::CheckBuildOptions(const wxBuildOptions& buildOptions)
 459 {
 460     return CheckBuildOptions(buildOptions.m_signature, "your program");
 461 }
 462
 463 #endif
 464
 465 // ============================================================================
 466 // other classes implementations
 467 // ============================================================================
 468
 469 // ----------------------------------------------------------------------------
 470 // wxConsoleAppTraitsBase
 471 // ----------------------------------------------------------------------------
 472
 473 #if wxUSE_LOG
 474
 475 wxLog *wxConsoleAppTraitsBase::CreateLogTarget()
 476 {
 477     return new wxLogStderr;
 478 }
 479
 480 #endif // wxUSE_LOG
 481
 482 wxMessageOutput *wxConsoleAppTraitsBase::CreateMessageOutput()
 483 {
 484     return new wxMessageOutputStderr;
 485 }
 486
 487 #if wxUSE_FONTMAP
 488
 489 wxFontMapper *wxConsoleAppTraitsBase::CreateFontMapper()
 490 {
 491     return (wxFontMapper *)new wxFontMapperBase;
 492 }
 493
 494 #endif // wxUSE_FONTMAP
 495
 496 wxRendererNative *wxConsoleAppTraitsBase::CreateRenderer()
 497 {
 498     // console applications don't use renderers
 499     return NULL;
 500 }
 501
 502 #ifdef __WXDEBUG__
 503 bool wxConsoleAppTraitsBase::ShowAssertDialog(const wxString& msg)
 504 {
 505     return wxAppTraitsBase::ShowAssertDialog(msg);
 506 }
 507 #endif
 508
 509 bool wxConsoleAppTraitsBase::HasStderr()
 510 {
 511     // console applications always have stderr, even under Mac/Windows
 512     return true;
 513 }
 514
 515 void wxConsoleAppTraitsBase::ScheduleForDestroy(wxObject *object)
 516 {
 517     delete object;
 518 }
 519
 520 void wxConsoleAppTraitsBase::RemoveFromPendingDelete(wxObject * WXUNUSED(object))
 521 {
 522     // nothing to do
 523 }
 524
 525 #if wxUSE_SOCKETS
 526 GSocketGUIFunctionsTable* wxConsoleAppTraitsBase::GetSocketGUIFunctionsTable()
 527 {
 528     return NULL;
 529 }
 530 #endif
 531
 532 // ----------------------------------------------------------------------------
 533 // wxAppTraits
 534 // ----------------------------------------------------------------------------
 535
 536 #ifdef __WXDEBUG__
 537
 538 bool wxAppTraitsBase::ShowAssertDialog(const wxString& msg)
 539 {
 540     return DoShowAssertDialog(msg);
 541 }
 542
 543 #endif // __WXDEBUG__
 544
 545 // ============================================================================
 546 // global functions implementation
 547 // ============================================================================
 548
 549 void wxExit()
 550 {
 551     if ( wxTheApp )
 552     {
 553         wxTheApp->Exit();
 554     }
 555     else
 556     {
 557         // what else can we do?
 558         exit(-1);
 559     }
 560 }
 561
 562 void wxWakeUpIdle()
 563 {
 564     if ( wxTheApp )
 565     {
 566         wxTheApp->WakeUpIdle();
 567     }
 568     //else: do nothing, what can we do?
 569 }
 570
 571 #ifdef  __WXDEBUG__
 572
 573 // wxASSERT() helper
 574 bool wxAssertIsEqual(int x, int y)
 575 {
 576     return x == y;
 577 }
 578
 579 // break into the debugger
 580 void wxTrap()
 581 {
 582 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 583     DebugBreak();
 584 #elif defined(__WXMAC__) && !defined(__DARWIN__)
 585     #if __powerc
 586         Debugger();
 587     #else
 588         SysBreak();
 589     #endif
 590 #elif defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
 591     Debugger();
 592 #elif defined(__UNIX__)
 593     raise(SIGTRAP);
 594 #else
 595     // TODO
 596 #endif // Win/Unix
 597 }
 598
 599 void wxAssert(int cond,
 600               const wxChar *szFile,
 601               int nLine,
 602               const wxChar *szCond,
 603               const wxChar *szMsg)
 604 {
 605     if ( !cond )
 606         wxOnAssert(szFile, nLine, szCond, szMsg);
 607 }
 608
 609 // this function is called when an assert fails
 610 void wxOnAssert(const wxChar *szFile,
 611                 int nLine,
 612                 const wxChar *szCond,
 613                 const wxChar *szMsg)
 614 {
 615     // FIXME MT-unsafe
 616     static bool s_bInAssert = false;
 617
 618     if ( s_bInAssert )
 619     {
 620         // He-e-e-e-elp!! we're trapped in endless loop
 621         wxTrap();
 622
 623         s_bInAssert = false;
 624
 625         return;
 626     }
 627
 628     s_bInAssert = true;
 629
 630     if ( !wxTheApp )
 631     {
 632         // by default, show the assert dialog box -- we can't customize this
 633         // behaviour
 634         ShowAssertDialog(szFile, nLine, szCond, szMsg);
 635     }
 636     else
 637     {
 638         // let the app process it as it wants
 639         wxTheApp->OnAssert(szFile, nLine, szCond, szMsg);
 640     }
 641
 642     s_bInAssert = false;
 643 }
 644
 645 #endif // __WXDEBUG__
 646
 647 // ============================================================================
 648 // private functions implementation
 649 // ============================================================================
 650
 651 #ifdef __WXDEBUG__
 652
 653 static void LINKAGEMODE SetTraceMasks()
 654 {
 655 #if wxUSE_LOG
 656     wxString mask;
 657     if ( wxGetEnv(wxT("WXTRACE"), &mask) )
 658     {
 659         wxStringTokenizer tkn(mask, wxT(",;:"));
 660         while ( tkn.HasMoreTokens() )
 661             wxLog::AddTraceMask(tkn.GetNextToken());
 662     }
 663 #endif // wxUSE_LOG
 664 }
 665
 666 bool DoShowAssertDialog(const wxString& msg)
 667 {
 668     // under MSW we can show the dialog even in the console mode
 669 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 670     wxString msgDlg(msg);
 671
 672     // this message is intentionally not translated -- it is for
 673     // developpers only
 674     msgDlg += wxT("\nDo you want to stop the program?\n")
 675               wxT("You can also choose [Cancel] to suppress ")
 676               wxT("further warnings.");
 677
 678     switch ( ::MessageBox(NULL, msgDlg, _T("wxWidgets Debug Alert"),
 679                           MB_YESNOCANCEL | MB_ICONSTOP ) )
 680     {
 681         case IDYES:
 682             wxTrap();
 683             break;
 684
 685         case IDCANCEL:
 686             // stop the asserts
 687             return true;
 688
 689         //case IDNO: nothing to do
 690     }
 691 #else // !__WXMSW__
 692     wxFprintf(stderr, wxT("%s\n"), msg.c_str());
 693     fflush(stderr);
 694
 695     // TODO: ask the user to enter "Y" or "N" on the console?
 696     wxTrap();
 697 #endif // __WXMSW__/!__WXMSW__
 698
 699     // continue with the asserts
 700     return false;
 701 }
 702
 703 // show the assert modal dialog
 704 static
 705 void ShowAssertDialog(const wxChar *szFile,
 706                       int nLine,
 707                       const wxChar *szCond,
 708                       const wxChar *szMsg,
 709                       wxAppTraits *traits)
 710 {
 711     // this variable can be set to true to suppress "assert failure" messages
 712     static bool s_bNoAsserts = false;
 713
 714     wxString msg;
 715     msg.reserve(2048);
 716
 717     // make life easier for people using VC++ IDE by using this format: like
 718     // this, clicking on the message will take us immediately to the place of
 719     // the failed assert
 720     msg.Printf(wxT("%s(%d): assert \"%s\" failed"), szFile, nLine, szCond);
 721
 722     if ( szMsg )
 723     {
 724         msg << _T(": ") << szMsg;
 725     }
 726     else // no message given
 727     {
 728         msg << _T('.');
 729     }
 730
 731 #if wxUSE_STACKWALKER
 732     class StackDump : public wxStackWalker
 733     {
 734     public:
 735         StackDump() { }
 736
 737         const wxString& GetStackTrace() const { return m_stackTrace; }
 738
 739     protected:
 740         virtual void OnStackFrame(const wxStackFrame& frame)
 741         {
 742             m_stackTrace << wxString::Format(_T("[%02d] "), frame.GetLevel());
 743
 744             wxString name = frame.GetName();
 745             if ( !name.empty() )
 746             {
 747                 m_stackTrace << wxString::Format(_T("%-40s"), name.c_str());
 748             }
 749             else
 750             {
 751                 m_stackTrace << wxString::Format
 752                                 (
 753                                     _T("0x%08lx"),
 754                                     (unsigned long)frame.GetAddress()
 755                                 );
 756             }
 757
 758             if ( frame.HasSourceLocation() )
 759             {
 760                 m_stackTrace << _T('\t')
 761                              << frame.GetFileName()
 762                              << _T(':')
 763                              << frame.GetLine();
 764             }
 765
 766             m_stackTrace << _T('\n');
 767         }
 768
 769     private:
 770         wxString m_stackTrace;
 771     };
 772
 773     StackDump dump;
 774     dump.Walk(5); // don't show OnAssert() call itself
 775     wxString stackTrace = dump.GetStackTrace();
 776
 777     // don't show more than maxLines or we could get a dialog too tall to be
 778     // shown on screen: 20 should be ok everywhere as even with 15 pixel high
 779     // characters it is still only 300 pixels...
 780     const int maxLines = 20;
 781     int count = stackTrace.Freq(wxT('\n'));
 782     if (count > maxLines)
 783     {
 784         int i;
 785         for (i = 0; i < count - maxLines; i++)
 786             stackTrace = stackTrace.BeforeLast(wxT('\n'));
 787     }
 788     if ( !stackTrace.empty() )
 789     {
 790         msg << _T("\n\nCall stack:\n")
 791             << stackTrace;
 792     }
 793 #endif // wxUSE_STACKWALKER
 794
 795 #if wxUSE_THREADS
 796     // if we are not in the main thread, output the assert directly and trap
 797     // since dialogs cannot be displayed
 798     if ( !wxThread::IsMain() )
 799     {
 800         msg += wxT(" [in child thread]");
 801
 802 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 803         msg << wxT("\r\n");
 804         OutputDebugString(msg );
 805 #else
 806         // send to stderr
 807         wxFprintf(stderr, wxT("%s\n"), msg.c_str());
 808         fflush(stderr);
 809 #endif
 810         // He-e-e-e-elp!! we're asserting in a child thread
 811         wxTrap();
 812     }
 813     else
 814 #endif // wxUSE_THREADS
 815
 816     if ( !s_bNoAsserts )
 817     {
 818         // send it to the normal log destination
 819         wxLogDebug(_T("%s"), msg.c_str());
 820
 821         if ( traits )
 822         {
 823             // delegate showing assert dialog (if possible) to that class
 824             s_bNoAsserts = traits->ShowAssertDialog(msg);
 825         }
 826         else // no traits object
 827         {
 828             // fall back to the function of last resort
 829             s_bNoAsserts = DoShowAssertDialog(msg);
 830         }
 831     }
 832 }
 833
 834 #endif // __WXDEBUG__
 835