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     #ifdef __DARWIN__
  61         #include  <CoreServices/CoreServices.h>
  62     #else
  63         #include  "wx/mac/private.h"  // includes mac headers
  64     #endif
  65 #endif // __WXMAC__
  66
  67 #ifdef __WXDEBUG__
  68     #if wxUSE_STACKWALKER
  69         #include "wx/stackwalk.h"
  70         #ifdef __WXMSW__
  71             #include "wx/msw/debughlp.h"
  72         #endif
  73     #endif // wxUSE_STACKWALKER
  74 #endif // __WXDEBUG__
  75
  76 // wxABI_VERSION can be defined when compiling applications but it should be
  77 // left undefined when compiling the library itself, it is then set to its
  78 // default value in version.h
  79 #if wxABI_VERSION != wxMAJOR_VERSION * 10000 + wxMINOR_VERSION * 100 + 99
  80 #error "wxABI_VERSION should not be defined when compiling the library"
  81 #endif
  82
  83 // ----------------------------------------------------------------------------
  84 // private functions prototypes
  85 // ----------------------------------------------------------------------------
  86
  87 #ifdef __WXDEBUG__
  88     // really just show the assert dialog
  89     static bool DoShowAssertDialog(const wxString& msg);
  90
  91     // prepare for showing the assert dialog, use the given traits or
  92     // DoShowAssertDialog() as last fallback to really show it
  93     static
  94     void ShowAssertDialog(const wxChar *szFile,
  95                           int nLine,
  96                           const wxChar *szCond,
  97                           const wxChar *szMsg,
  98                           wxAppTraits *traits = NULL);
  99
 100     // turn on the trace masks specified in the env variable WXTRACE
 101     static void LINKAGEMODE SetTraceMasks();
 102 #endif // __WXDEBUG__
 103
 104 // ----------------------------------------------------------------------------
 105 // global vars
 106 // ----------------------------------------------------------------------------
 107
 108 wxAppConsole *wxAppConsole::ms_appInstance = NULL;
 109
 110 wxAppInitializerFunction wxAppConsole::ms_appInitFn = NULL;
 111
 112 // ============================================================================
 113 // wxAppConsole implementation
 114 // ============================================================================
 115
 116 // ----------------------------------------------------------------------------
 117 // ctor/dtor
 118 // ----------------------------------------------------------------------------
 119
 120 wxAppConsole::wxAppConsole()
 121 {
 122     m_traits = NULL;
 123
 124     ms_appInstance = this;
 125
 126 #ifdef __WXDEBUG__
 127     SetTraceMasks();
 128 #if wxUSE_UNICODE
 129     // In unicode mode the SetTraceMasks call can cause an apptraits to be
 130     // created, but since we are still in the constructor the wrong kind will
 131     // be created for GUI apps.  Destroy it so it can be created again later.
 132     delete m_traits;
 133     m_traits = NULL;
 134 #endif
 135 #endif
 136 }
 137
 138 wxAppConsole::~wxAppConsole()
 139 {
 140     delete m_traits;
 141 }
 142
 143 // ----------------------------------------------------------------------------
 144 // initilization/cleanup
 145 // ----------------------------------------------------------------------------
 146
 147 bool wxAppConsole::Initialize(int& argcOrig, wxChar **argvOrig)
 148 {
 149     // remember the command line arguments
 150     argc = argcOrig;
 151     argv = argvOrig;
 152
 153 #ifndef __WXPALMOS__
 154     if ( m_appName.empty() && argv )
 155     {
 156         // the application name is, by default, the name of its executable file
 157         wxFileName::SplitPath(argv[0], NULL, &m_appName, NULL);
 158     }
 159 #endif
 160
 161     return true;
 162 }
 163
 164 void wxAppConsole::CleanUp()
 165 {
 166 }
 167
 168 // ----------------------------------------------------------------------------
 169 // OnXXX() callbacks
 170 // ----------------------------------------------------------------------------
 171
 172 bool wxAppConsole::OnInit()
 173 {
 174 #if wxUSE_CMDLINE_PARSER
 175     wxCmdLineParser parser(argc, argv);
 176
 177     OnInitCmdLine(parser);
 178
 179     bool cont;
 180     switch ( parser.Parse(false /* don't show usage */) )
 181     {
 182         case -1:
 183             cont = OnCmdLineHelp(parser);
 184             break;
 185
 186         case 0:
 187             cont = OnCmdLineParsed(parser);
 188             break;
 189
 190         default:
 191             cont = OnCmdLineError(parser);
 192             break;
 193     }
 194
 195     if ( !cont )
 196         return false;
 197 #endif // wxUSE_CMDLINE_PARSER
 198
 199     return true;
 200 }
 201
 202 int wxAppConsole::OnExit()
 203 {
 204 #if wxUSE_CONFIG
 205     // delete the config object if any (don't use Get() here, but Set()
 206     // because Get() could create a new config object)
 207     delete wxConfigBase::Set((wxConfigBase *) NULL);
 208 #endif // wxUSE_CONFIG
 209
 210     return 0;
 211 }
 212
 213 void wxAppConsole::Exit()
 214 {
 215     exit(-1);
 216 }
 217
 218 // ----------------------------------------------------------------------------
 219 // traits stuff
 220 // ----------------------------------------------------------------------------
 221
 222 wxAppTraits *wxAppConsole::CreateTraits()
 223 {
 224     return new wxConsoleAppTraits;
 225 }
 226
 227 wxAppTraits *wxAppConsole::GetTraits()
 228 {
 229     // FIXME-MT: protect this with a CS?
 230     if ( !m_traits )
 231     {
 232         m_traits = CreateTraits();
 233
 234         wxASSERT_MSG( m_traits, _T("wxApp::CreateTraits() failed?") );
 235     }
 236
 237     return m_traits;
 238 }
 239
 240 // we must implement CreateXXX() in wxApp itself for backwards compatibility
 241 #if WXWIN_COMPATIBILITY_2_4
 242
 243 #if wxUSE_LOG
 244
 245 wxLog *wxAppConsole::CreateLogTarget()
 246 {
 247     wxAppTraits *traits = GetTraits();
 248     return traits ? traits->CreateLogTarget() : NULL;
 249 }
 250
 251 #endif // wxUSE_LOG
 252
 253 wxMessageOutput *wxAppConsole::CreateMessageOutput()
 254 {
 255     wxAppTraits *traits = GetTraits();
 256     return traits ? traits->CreateMessageOutput() : NULL;
 257 }
 258
 259 #endif // WXWIN_COMPATIBILITY_2_4
 260
 261 // ----------------------------------------------------------------------------
 262 // event processing
 263 // ----------------------------------------------------------------------------
 264
 265 void wxAppConsole::ProcessPendingEvents()
 266 {
 267 #if wxUSE_THREADS
 268     if ( !wxPendingEventsLocker )
 269         return;
 270 #endif
 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
 292         handler->ProcessPendingEvents();
 293
 294         wxENTER_CRIT_SECT( *wxPendingEventsLocker );
 295
 296         node = wxPendingEvents->GetFirst();
 297     }
 298
 299     wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
 300 }
 301
 302 int wxAppConsole::FilterEvent(wxEvent& WXUNUSED(event))
 303 {
 304     // process the events normally by default
 305     return -1;
 306 }
 307
 308 // ----------------------------------------------------------------------------
 309 // exception handling
 310 // ----------------------------------------------------------------------------
 311
 312 #if wxUSE_EXCEPTIONS
 313
 314 void
 315 wxAppConsole::HandleEvent(wxEvtHandler *handler,
 316                           wxEventFunction func,
 317                           wxEvent& event) const
 318 {
 319     // by default, simply call the handler
 320     (handler->*func)(event);
 321 }
 322
 323 bool
 324 wxAppConsole::OnExceptionInMainLoop()
 325 {
 326     throw;
 327
 328     // some compilers are too stupid to know that we never return after throw
 329 #if defined(__DMC__) || (defined(_MSC_VER) && _MSC_VER < 1200)
 330     return false;
 331 #endif
 332 }
 333
 334 #endif // wxUSE_EXCEPTIONS
 335
 336 // ----------------------------------------------------------------------------
 337 // cmd line parsing
 338 // ----------------------------------------------------------------------------
 339
 340 #if wxUSE_CMDLINE_PARSER
 341
 342 #define OPTION_VERBOSE _T("verbose")
 343
 344 void wxAppConsole::OnInitCmdLine(wxCmdLineParser& parser)
 345 {
 346     // the standard command line options
 347     static const wxCmdLineEntryDesc cmdLineDesc[] =
 348     {
 349         {
 350             wxCMD_LINE_SWITCH,
 351             _T("h"),
 352             _T("help"),
 353             gettext_noop("show this help message"),
 354             wxCMD_LINE_VAL_NONE,
 355             wxCMD_LINE_OPTION_HELP
 356         },
 357
 358 #if wxUSE_LOG
 359         {
 360             wxCMD_LINE_SWITCH,
 361             wxEmptyString,
 362             OPTION_VERBOSE,
 363             gettext_noop("generate verbose log messages"),
 364             wxCMD_LINE_VAL_NONE,
 365             0x0
 366         },
 367 #endif // wxUSE_LOG
 368
 369         // terminator
 370         {
 371             wxCMD_LINE_NONE,
 372             wxEmptyString,
 373             wxEmptyString,
 374             wxEmptyString,
 375             wxCMD_LINE_VAL_NONE,
 376             0x0
 377         }
 378     };
 379
 380     parser.SetDesc(cmdLineDesc);
 381 }
 382
 383 bool wxAppConsole::OnCmdLineParsed(wxCmdLineParser& parser)
 384 {
 385 #if wxUSE_LOG
 386     if ( parser.Found(OPTION_VERBOSE) )
 387     {
 388         wxLog::SetVerbose(true);
 389     }
 390 #else
 391     wxUnusedVar(parser);
 392 #endif // wxUSE_LOG
 393
 394     return true;
 395 }
 396
 397 bool wxAppConsole::OnCmdLineHelp(wxCmdLineParser& parser)
 398 {
 399     parser.Usage();
 400
 401     return false;
 402 }
 403
 404 bool wxAppConsole::OnCmdLineError(wxCmdLineParser& parser)
 405 {
 406     parser.Usage();
 407
 408     return false;
 409 }
 410
 411 #endif // wxUSE_CMDLINE_PARSER
 412
 413 // ----------------------------------------------------------------------------
 414 // debugging support
 415 // ----------------------------------------------------------------------------
 416
 417 /* static */
 418 bool wxAppConsole::CheckBuildOptions(const char *optionsSignature,
 419                                      const char *componentName)
 420 {
 421 #if 0 // can't use wxLogTrace, not up and running yet
 422     printf("checking build options object '%s' (ptr %p) in '%s'\n",
 423              optionsSignature, optionsSignature, componentName);
 424 #endif
 425
 426     if ( strcmp(optionsSignature, WX_BUILD_OPTIONS_SIGNATURE) != 0 )
 427     {
 428         wxString lib = wxString::FromAscii(WX_BUILD_OPTIONS_SIGNATURE);
 429         wxString prog = wxString::FromAscii(optionsSignature);
 430         wxString progName = wxString::FromAscii(componentName);
 431         wxString msg;
 432
 433         msg.Printf(_T("Mismatch between the program and library build versions detected.\nThe library used %s,\nand %s used %s."),
 434                    lib.c_str(), progName.c_str(), prog.c_str());
 435
 436         wxLogFatalError(msg.c_str());
 437
 438         // normally wxLogFatalError doesn't return
 439         return false;
 440     }
 441 #undef wxCMP
 442
 443     return true;
 444 }
 445
 446 #ifdef __WXDEBUG__
 447
 448 void wxAppConsole::OnAssert(const wxChar *file,
 449                             int line,
 450                             const wxChar *cond,
 451                             const wxChar *msg)
 452 {
 453     ShowAssertDialog(file, line, cond, msg, GetTraits());
 454 }
 455
 456 #endif // __WXDEBUG__
 457
 458 #if WXWIN_COMPATIBILITY_2_4
 459
 460 bool wxAppConsole::CheckBuildOptions(const wxBuildOptions& buildOptions)
 461 {
 462     return CheckBuildOptions(buildOptions.m_signature, "your program");
 463 }
 464
 465 #endif
 466
 467 // ============================================================================
 468 // other classes implementations
 469 // ============================================================================
 470
 471 // ----------------------------------------------------------------------------
 472 // wxConsoleAppTraitsBase
 473 // ----------------------------------------------------------------------------
 474
 475 #if wxUSE_LOG
 476
 477 wxLog *wxConsoleAppTraitsBase::CreateLogTarget()
 478 {
 479     return new wxLogStderr;
 480 }
 481
 482 #endif // wxUSE_LOG
 483
 484 wxMessageOutput *wxConsoleAppTraitsBase::CreateMessageOutput()
 485 {
 486     return new wxMessageOutputStderr;
 487 }
 488
 489 #if wxUSE_FONTMAP
 490
 491 wxFontMapper *wxConsoleAppTraitsBase::CreateFontMapper()
 492 {
 493     return (wxFontMapper *)new wxFontMapperBase;
 494 }
 495
 496 #endif // wxUSE_FONTMAP
 497
 498 wxRendererNative *wxConsoleAppTraitsBase::CreateRenderer()
 499 {
 500     // console applications don't use renderers
 501     return NULL;
 502 }
 503
 504 #ifdef __WXDEBUG__
 505 bool wxConsoleAppTraitsBase::ShowAssertDialog(const wxString& msg)
 506 {
 507     return wxAppTraitsBase::ShowAssertDialog(msg);
 508 }
 509 #endif
 510
 511 bool wxConsoleAppTraitsBase::HasStderr()
 512 {
 513     // console applications always have stderr, even under Mac/Windows
 514     return true;
 515 }
 516
 517 void wxConsoleAppTraitsBase::ScheduleForDestroy(wxObject *object)
 518 {
 519     delete object;
 520 }
 521
 522 void wxConsoleAppTraitsBase::RemoveFromPendingDelete(wxObject * WXUNUSED(object))
 523 {
 524     // nothing to do
 525 }
 526
 527 #if wxUSE_SOCKETS
 528 GSocketGUIFunctionsTable* wxConsoleAppTraitsBase::GetSocketGUIFunctionsTable()
 529 {
 530     return NULL;
 531 }
 532 #endif
 533
 534 // ----------------------------------------------------------------------------
 535 // wxAppTraits
 536 // ----------------------------------------------------------------------------
 537
 538 #ifdef __WXDEBUG__
 539
 540 bool wxAppTraitsBase::ShowAssertDialog(const wxString& msg)
 541 {
 542     return DoShowAssertDialog(msg);
 543 }
 544
 545 #endif // __WXDEBUG__
 546
 547 // ============================================================================
 548 // global functions implementation
 549 // ============================================================================
 550
 551 void wxExit()
 552 {
 553     if ( wxTheApp )
 554     {
 555         wxTheApp->Exit();
 556     }
 557     else
 558     {
 559         // what else can we do?
 560         exit(-1);
 561     }
 562 }
 563
 564 void wxWakeUpIdle()
 565 {
 566     if ( wxTheApp )
 567     {
 568         wxTheApp->WakeUpIdle();
 569     }
 570     //else: do nothing, what can we do?
 571 }
 572
 573 #ifdef  __WXDEBUG__
 574
 575 // wxASSERT() helper
 576 bool wxAssertIsEqual(int x, int y)
 577 {
 578     return x == y;
 579 }
 580
 581 // break into the debugger
 582 void wxTrap()
 583 {
 584 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 585     DebugBreak();
 586 #elif defined(__WXMAC__) && !defined(__DARWIN__)
 587     #if __powerc
 588         Debugger();
 589     #else
 590         SysBreak();
 591     #endif
 592 #elif defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
 593     Debugger();
 594 #elif defined(__UNIX__)
 595     raise(SIGTRAP);
 596 #else
 597     // TODO
 598 #endif // Win/Unix
 599 }
 600
 601 void wxAssert(int cond,
 602               const wxChar *szFile,
 603               int nLine,
 604               const wxChar *szCond,
 605               const wxChar *szMsg)
 606 {
 607     if ( !cond )
 608         wxOnAssert(szFile, nLine, szCond, szMsg);
 609 }
 610
 611 // this function is called when an assert fails
 612 void wxOnAssert(const wxChar *szFile,
 613                 int nLine,
 614                 const wxChar *szCond,
 615                 const wxChar *szMsg)
 616 {
 617     // FIXME MT-unsafe
 618     static bool s_bInAssert = false;
 619
 620     if ( s_bInAssert )
 621     {
 622         // He-e-e-e-elp!! we're trapped in endless loop
 623         wxTrap();
 624
 625         s_bInAssert = false;
 626
 627         return;
 628     }
 629
 630     s_bInAssert = true;
 631
 632     if ( !wxTheApp )
 633     {
 634         // by default, show the assert dialog box -- we can't customize this
 635         // behaviour
 636         ShowAssertDialog(szFile, nLine, szCond, szMsg);
 637     }
 638     else
 639     {
 640         // let the app process it as it wants
 641         wxTheApp->OnAssert(szFile, nLine, szCond, szMsg);
 642     }
 643
 644     s_bInAssert = false;
 645 }
 646
 647 #endif // __WXDEBUG__
 648
 649 // ============================================================================
 650 // private functions implementation
 651 // ============================================================================
 652
 653 #ifdef __WXDEBUG__
 654
 655 static void LINKAGEMODE SetTraceMasks()
 656 {
 657 #if wxUSE_LOG
 658     wxString mask;
 659     if ( wxGetEnv(wxT("WXTRACE"), &mask) )
 660     {
 661         wxStringTokenizer tkn(mask, wxT(",;:"));
 662         while ( tkn.HasMoreTokens() )
 663             wxLog::AddTraceMask(tkn.GetNextToken());
 664     }
 665 #endif // wxUSE_LOG
 666 }
 667
 668 bool DoShowAssertDialog(const wxString& msg)
 669 {
 670     // under MSW we can show the dialog even in the console mode
 671 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 672     wxString msgDlg(msg);
 673
 674     // this message is intentionally not translated -- it is for
 675     // developpers only
 676     msgDlg += wxT("\nDo you want to stop the program?\n")
 677               wxT("You can also choose [Cancel] to suppress ")
 678               wxT("further warnings.");
 679
 680     switch ( ::MessageBox(NULL, msgDlg, _T("wxWidgets Debug Alert"),
 681                           MB_YESNOCANCEL | MB_ICONSTOP ) )
 682     {
 683         case IDYES:
 684             wxTrap();
 685             break;
 686
 687         case IDCANCEL:
 688             // stop the asserts
 689             return true;
 690
 691         //case IDNO: nothing to do
 692     }
 693 #else // !__WXMSW__
 694     wxFprintf(stderr, wxT("%s\n"), msg.c_str());
 695     fflush(stderr);
 696
 697     // TODO: ask the user to enter "Y" or "N" on the console?
 698     wxTrap();
 699 #endif // __WXMSW__/!__WXMSW__
 700
 701     // continue with the asserts
 702     return false;
 703 }
 704
 705 #if wxUSE_STACKWALKER
 706 static wxString GetAssertStackTrace()
 707 {
 708     wxString stackTrace;
 709
 710     class StackDump : public wxStackWalker
 711     {
 712     public:
 713         StackDump() { }
 714
 715         const wxString& GetStackTrace() const { return m_stackTrace; }
 716
 717     protected:
 718         virtual void OnStackFrame(const wxStackFrame& frame)
 719         {
 720             m_stackTrace << wxString::Format
 721                             (
 722                               _T("[%02d] "),
 723                               wx_truncate_cast(int, frame.GetLevel())
 724                             );
 725
 726             wxString name = frame.GetName();
 727             if ( !name.empty() )
 728             {
 729                 m_stackTrace << wxString::Format(_T("%-40s"), name.c_str());
 730             }
 731             else
 732             {
 733                 m_stackTrace << wxString::Format(_T("%p"), frame.GetAddress());
 734             }
 735
 736             if ( frame.HasSourceLocation() )
 737             {
 738                 m_stackTrace << _T('\t')
 739                              << frame.GetFileName()
 740                              << _T(':')
 741                              << frame.GetLine();
 742             }
 743
 744             m_stackTrace << _T('\n');
 745         }
 746
 747     private:
 748         wxString m_stackTrace;
 749     };
 750
 751     StackDump dump;
 752     dump.Walk(5); // don't show OnAssert() call itself
 753     stackTrace = dump.GetStackTrace();
 754
 755     // don't show more than maxLines or we could get a dialog too tall to be
 756     // shown on screen: 20 should be ok everywhere as even with 15 pixel high
 757     // characters it is still only 300 pixels...
 758     static const int maxLines = 20;
 759     const int count = stackTrace.Freq(wxT('\n'));
 760     for ( int i = 0; i < count - maxLines; i++ )
 761         stackTrace = stackTrace.BeforeLast(wxT('\n'));
 762
 763     return stackTrace;
 764 }
 765 #endif // wxUSE_STACKWALKER
 766
 767 // show the assert modal dialog
 768 static
 769 void ShowAssertDialog(const wxChar *szFile,
 770                       int nLine,
 771                       const wxChar *szCond,
 772                       const wxChar *szMsg,
 773                       wxAppTraits *traits)
 774 {
 775     // this variable can be set to true to suppress "assert failure" messages
 776     static bool s_bNoAsserts = false;
 777
 778     wxString msg;
 779     msg.reserve(2048);
 780
 781     // make life easier for people using VC++ IDE by using this format: like
 782     // this, clicking on the message will take us immediately to the place of
 783     // the failed assert
 784     msg.Printf(wxT("%s(%d): assert \"%s\" failed"), szFile, nLine, szCond);
 785
 786     if ( szMsg )
 787     {
 788         msg << _T(": ") << szMsg;
 789     }
 790     else // no message given
 791     {
 792         msg << _T('.');
 793     }
 794
 795 #if wxUSE_STACKWALKER
 796     const wxString stackTrace = GetAssertStackTrace();
 797     if ( !stackTrace.empty() )
 798     {
 799         msg << _T("\n\nCall stack:\n") << stackTrace;
 800     }
 801 #endif // wxUSE_STACKWALKER
 802
 803 #if wxUSE_THREADS
 804     // if we are not in the main thread, output the assert directly and trap
 805     // since dialogs cannot be displayed
 806     if ( !wxThread::IsMain() )
 807     {
 808         msg += wxT(" [in child thread]");
 809
 810 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 811         msg << wxT("\r\n");
 812         OutputDebugString(msg );
 813 #else
 814         // send to stderr
 815         wxFprintf(stderr, wxT("%s\n"), msg.c_str());
 816         fflush(stderr);
 817 #endif
 818         // He-e-e-e-elp!! we're asserting in a child thread
 819         wxTrap();
 820     }
 821     else
 822 #endif // wxUSE_THREADS
 823
 824     if ( !s_bNoAsserts )
 825     {
 826         // send it to the normal log destination
 827         wxLogDebug(_T("%s"), msg.c_str());
 828
 829         if ( traits )
 830         {
 831             // delegate showing assert dialog (if possible) to that class
 832             s_bNoAsserts = traits->ShowAssertDialog(msg);
 833         }
 834         else // no traits object
 835         {
 836             // fall back to the function of last resort
 837             s_bNoAsserts = DoShowAssertDialog(msg);
 838         }
 839     }
 840 }
 841
 842 #endif // __WXDEBUG__
 843