src/common/appbase.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/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     #ifdef __WXMSW__
  29         #include  "wx/msw/wrapwin.h"  // includes windows.h for MessageBox()
  30     #endif
  31     #include "wx/list.h"
  32     #include "wx/app.h"
  33     #include "wx/intl.h"
  34     #include "wx/log.h"
  35     #include "wx/utils.h"
  36 #endif //WX_PRECOMP
  37
  38 #include "wx/apptrait.h"
  39 #include "wx/cmdline.h"
  40 #include "wx/confbase.h"
  41 #include "wx/filename.h"
  42 #include "wx/msgout.h"
  43 #include "wx/tokenzr.h"
  44
  45 #if !defined(__WXMSW__) || defined(__WXMICROWIN__)
  46   #include  <signal.h>      // for SIGTRAP used by wxTrap()
  47 #endif  //Win/Unix
  48
  49 #if wxUSE_FONTMAP
  50     #include "wx/fontmap.h"
  51 #endif // wxUSE_FONTMAP
  52
  53 #if defined(__DARWIN__) && defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
  54     // For MacTypes.h for Debugger function
  55     #include <CoreFoundation/CFBase.h>
  56 #endif
  57
  58 #if defined(__WXMAC__)
  59     #ifdef __DARWIN__
  60         #include  <CoreServices/CoreServices.h>
  61     #else
  62         #include  "wx/mac/private.h"  // includes mac headers
  63     #endif
  64 #endif // __WXMAC__
  65
  66 #ifdef __WXDEBUG__
  67     #if wxUSE_STACKWALKER
  68         #include "wx/stackwalk.h"
  69         #ifdef __WXMSW__
  70             #include "wx/msw/debughlp.h"
  71         #endif
  72     #endif // wxUSE_STACKWALKER
  73 #endif // __WXDEBUG__
  74
  75 // wxABI_VERSION can be defined when compiling applications but it should be
  76 // left undefined when compiling the library itself, it is then set to its
  77 // default value in version.h
  78 #if wxABI_VERSION != wxMAJOR_VERSION * 10000 + wxMINOR_VERSION * 100 + 99
  79 #error "wxABI_VERSION should not be defined when compiling the library"
  80 #endif
  81
  82 // ----------------------------------------------------------------------------
  83 // private functions prototypes
  84 // ----------------------------------------------------------------------------
  85
  86 #ifdef __WXDEBUG__
  87     // really just show the assert dialog
  88     static bool DoShowAssertDialog(const wxString& msg);
  89
  90     // prepare for showing the assert dialog, use the given traits or
  91     // DoShowAssertDialog() as last fallback to really show it
  92     static
  93     void ShowAssertDialog(const wxChar *szFile,
  94                           int nLine,
  95                           const wxChar *szFunc,
  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 wxLayoutDirection wxAppConsole::GetLayoutDirection() const
 219 {
 220 #if wxUSE_INTL
 221     const wxLocale *const locale = wxGetLocale();
 222     if ( locale )
 223     {
 224         const wxLanguageInfo *const
 225             info = wxLocale::GetLanguageInfo(locale->GetLanguage());
 226
 227         if ( info )
 228             return info->LayoutDirection;
 229     }
 230 #endif // wxUSE_INTL
 231
 232     // we don't know
 233     return wxLayout_Default;
 234 }
 235
 236 // ----------------------------------------------------------------------------
 237 // traits stuff
 238 // ----------------------------------------------------------------------------
 239
 240 wxAppTraits *wxAppConsole::CreateTraits()
 241 {
 242     return new wxConsoleAppTraits;
 243 }
 244
 245 wxAppTraits *wxAppConsole::GetTraits()
 246 {
 247     // FIXME-MT: protect this with a CS?
 248     if ( !m_traits )
 249     {
 250         m_traits = CreateTraits();
 251
 252         wxASSERT_MSG( m_traits, _T("wxApp::CreateTraits() failed?") );
 253     }
 254
 255     return m_traits;
 256 }
 257
 258 // we must implement CreateXXX() in wxApp itself for backwards compatibility
 259 #if WXWIN_COMPATIBILITY_2_4
 260
 261 #if wxUSE_LOG
 262
 263 wxLog *wxAppConsole::CreateLogTarget()
 264 {
 265     wxAppTraits *traits = GetTraits();
 266     return traits ? traits->CreateLogTarget() : NULL;
 267 }
 268
 269 #endif // wxUSE_LOG
 270
 271 wxMessageOutput *wxAppConsole::CreateMessageOutput()
 272 {
 273     wxAppTraits *traits = GetTraits();
 274     return traits ? traits->CreateMessageOutput() : NULL;
 275 }
 276
 277 #endif // WXWIN_COMPATIBILITY_2_4
 278
 279 // ----------------------------------------------------------------------------
 280 // event processing
 281 // ----------------------------------------------------------------------------
 282
 283 void wxAppConsole::ProcessPendingEvents()
 284 {
 285 #if wxUSE_THREADS
 286     if ( !wxPendingEventsLocker )
 287         return;
 288 #endif
 289
 290     // ensure that we're the only thread to modify the pending events list
 291     wxENTER_CRIT_SECT( *wxPendingEventsLocker );
 292
 293     if ( !wxPendingEvents )
 294     {
 295         wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
 296         return;
 297     }
 298
 299     // iterate until the list becomes empty
 300     wxList::compatibility_iterator node = wxPendingEvents->GetFirst();
 301     while (node)
 302     {
 303         wxEvtHandler *handler = (wxEvtHandler *)node->GetData();
 304         wxPendingEvents->Erase(node);
 305
 306         // In ProcessPendingEvents(), new handlers might be add
 307         // and we can safely leave the critical section here.
 308         wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
 309
 310         handler->ProcessPendingEvents();
 311
 312         wxENTER_CRIT_SECT( *wxPendingEventsLocker );
 313
 314         node = wxPendingEvents->GetFirst();
 315     }
 316
 317     wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
 318 }
 319
 320 int wxAppConsole::FilterEvent(wxEvent& WXUNUSED(event))
 321 {
 322     // process the events normally by default
 323     return -1;
 324 }
 325
 326 // ----------------------------------------------------------------------------
 327 // exception handling
 328 // ----------------------------------------------------------------------------
 329
 330 #if wxUSE_EXCEPTIONS
 331
 332 void
 333 wxAppConsole::HandleEvent(wxEvtHandler *handler,
 334                           wxEventFunction func,
 335                           wxEvent& event) const
 336 {
 337     // by default, simply call the handler
 338     (handler->*func)(event);
 339 }
 340
 341 #endif // wxUSE_EXCEPTIONS
 342
 343 // ----------------------------------------------------------------------------
 344 // cmd line parsing
 345 // ----------------------------------------------------------------------------
 346
 347 #if wxUSE_CMDLINE_PARSER
 348
 349 #define OPTION_VERBOSE _T("verbose")
 350
 351 void wxAppConsole::OnInitCmdLine(wxCmdLineParser& parser)
 352 {
 353     // the standard command line options
 354     static const wxCmdLineEntryDesc cmdLineDesc[] =
 355     {
 356         {
 357             wxCMD_LINE_SWITCH,
 358             _T("h"),
 359             _T("help"),
 360             gettext_noop("show this help message"),
 361             wxCMD_LINE_VAL_NONE,
 362             wxCMD_LINE_OPTION_HELP
 363         },
 364
 365 #if wxUSE_LOG
 366         {
 367             wxCMD_LINE_SWITCH,
 368             wxEmptyString,
 369             OPTION_VERBOSE,
 370             gettext_noop("generate verbose log messages"),
 371             wxCMD_LINE_VAL_NONE,
 372             0x0
 373         },
 374 #endif // wxUSE_LOG
 375
 376         // terminator
 377         {
 378             wxCMD_LINE_NONE,
 379             wxEmptyString,
 380             wxEmptyString,
 381             wxEmptyString,
 382             wxCMD_LINE_VAL_NONE,
 383             0x0
 384         }
 385     };
 386
 387     parser.SetDesc(cmdLineDesc);
 388 }
 389
 390 bool wxAppConsole::OnCmdLineParsed(wxCmdLineParser& parser)
 391 {
 392 #if wxUSE_LOG
 393     if ( parser.Found(OPTION_VERBOSE) )
 394     {
 395         wxLog::SetVerbose(true);
 396     }
 397 #else
 398     wxUnusedVar(parser);
 399 #endif // wxUSE_LOG
 400
 401     return true;
 402 }
 403
 404 bool wxAppConsole::OnCmdLineHelp(wxCmdLineParser& parser)
 405 {
 406     parser.Usage();
 407
 408     return false;
 409 }
 410
 411 bool wxAppConsole::OnCmdLineError(wxCmdLineParser& parser)
 412 {
 413     parser.Usage();
 414
 415     return false;
 416 }
 417
 418 #endif // wxUSE_CMDLINE_PARSER
 419
 420 // ----------------------------------------------------------------------------
 421 // debugging support
 422 // ----------------------------------------------------------------------------
 423
 424 /* static */
 425 bool wxAppConsole::CheckBuildOptions(const char *optionsSignature,
 426                                      const char *componentName)
 427 {
 428 #if 0 // can't use wxLogTrace, not up and running yet
 429     printf("checking build options object '%s' (ptr %p) in '%s'\n",
 430              optionsSignature, optionsSignature, componentName);
 431 #endif
 432
 433     if ( strcmp(optionsSignature, WX_BUILD_OPTIONS_SIGNATURE) != 0 )
 434     {
 435         wxString lib = wxString::FromAscii(WX_BUILD_OPTIONS_SIGNATURE);
 436         wxString prog = wxString::FromAscii(optionsSignature);
 437         wxString progName = wxString::FromAscii(componentName);
 438         wxString msg;
 439
 440         msg.Printf(_T("Mismatch between the program and library build versions detected.\nThe library used %s,\nand %s used %s."),
 441                    lib.c_str(), progName.c_str(), prog.c_str());
 442
 443         wxLogFatalError(msg.c_str());
 444
 445         // normally wxLogFatalError doesn't return
 446         return false;
 447     }
 448 #undef wxCMP
 449
 450     return true;
 451 }
 452
 453 #ifdef __WXDEBUG__
 454
 455 void wxAppConsole::OnAssertFailure(const wxChar *file,
 456                                    int line,
 457                                    const wxChar *func,
 458                                    const wxChar *cond,
 459                                    const wxChar *msg)
 460 {
 461     ShowAssertDialog(file, line, func, cond, msg, GetTraits());
 462 }
 463
 464 void wxAppConsole::OnAssert(const wxChar *file,
 465                             int line,
 466                             const wxChar *cond,
 467                             const wxChar *msg)
 468 {
 469     OnAssertFailure(file, line, NULL, cond, msg);
 470 }
 471
 472 #endif // __WXDEBUG__
 473
 474 #if WXWIN_COMPATIBILITY_2_4
 475
 476 bool wxAppConsole::CheckBuildOptions(const wxBuildOptions& buildOptions)
 477 {
 478     return CheckBuildOptions(buildOptions.m_signature, "your program");
 479 }
 480
 481 #endif
 482
 483 // ============================================================================
 484 // other classes implementations
 485 // ============================================================================
 486
 487 // ----------------------------------------------------------------------------
 488 // wxConsoleAppTraitsBase
 489 // ----------------------------------------------------------------------------
 490
 491 #if wxUSE_LOG
 492
 493 wxLog *wxConsoleAppTraitsBase::CreateLogTarget()
 494 {
 495     return new wxLogStderr;
 496 }
 497
 498 #endif // wxUSE_LOG
 499
 500 wxMessageOutput *wxConsoleAppTraitsBase::CreateMessageOutput()
 501 {
 502     return new wxMessageOutputStderr;
 503 }
 504
 505 #if wxUSE_FONTMAP
 506
 507 wxFontMapper *wxConsoleAppTraitsBase::CreateFontMapper()
 508 {
 509     return (wxFontMapper *)new wxFontMapperBase;
 510 }
 511
 512 #endif // wxUSE_FONTMAP
 513
 514 wxRendererNative *wxConsoleAppTraitsBase::CreateRenderer()
 515 {
 516     // console applications don't use renderers
 517     return NULL;
 518 }
 519
 520 #ifdef __WXDEBUG__
 521 bool wxConsoleAppTraitsBase::ShowAssertDialog(const wxString& msg)
 522 {
 523     return wxAppTraitsBase::ShowAssertDialog(msg);
 524 }
 525 #endif
 526
 527 bool wxConsoleAppTraitsBase::HasStderr()
 528 {
 529     // console applications always have stderr, even under Mac/Windows
 530     return true;
 531 }
 532
 533 void wxConsoleAppTraitsBase::ScheduleForDestroy(wxObject *object)
 534 {
 535     delete object;
 536 }
 537
 538 void wxConsoleAppTraitsBase::RemoveFromPendingDelete(wxObject * WXUNUSED(object))
 539 {
 540     // nothing to do
 541 }
 542
 543 #if wxUSE_SOCKETS
 544 GSocketGUIFunctionsTable* wxConsoleAppTraitsBase::GetSocketGUIFunctionsTable()
 545 {
 546     return NULL;
 547 }
 548 #endif
 549
 550 // ----------------------------------------------------------------------------
 551 // wxAppTraits
 552 // ----------------------------------------------------------------------------
 553
 554 #ifdef __WXDEBUG__
 555
 556 bool wxAppTraitsBase::ShowAssertDialog(const wxString& msg)
 557 {
 558     return DoShowAssertDialog(msg);
 559 }
 560
 561 #endif // __WXDEBUG__
 562
 563 // ============================================================================
 564 // global functions implementation
 565 // ============================================================================
 566
 567 void wxExit()
 568 {
 569     if ( wxTheApp )
 570     {
 571         wxTheApp->Exit();
 572     }
 573     else
 574     {
 575         // what else can we do?
 576         exit(-1);
 577     }
 578 }
 579
 580 void wxWakeUpIdle()
 581 {
 582     if ( wxTheApp )
 583     {
 584         wxTheApp->WakeUpIdle();
 585     }
 586     //else: do nothing, what can we do?
 587 }
 588
 589 #ifdef  __WXDEBUG__
 590
 591 // wxASSERT() helper
 592 bool wxAssertIsEqual(int x, int y)
 593 {
 594     return x == y;
 595 }
 596
 597 // break into the debugger
 598 void wxTrap()
 599 {
 600 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 601     DebugBreak();
 602 #elif defined(__WXMAC__) && !defined(__DARWIN__)
 603     #if __powerc
 604         Debugger();
 605     #else
 606         SysBreak();
 607     #endif
 608 #elif defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
 609     Debugger();
 610 #elif defined(__UNIX__)
 611     raise(SIGTRAP);
 612 #else
 613     // TODO
 614 #endif // Win/Unix
 615 }
 616
 617 // this function is called when an assert fails
 618 void wxOnAssert(const wxChar *szFile,
 619                 int nLine,
 620                 const char *szFunc,
 621                 const wxChar *szCond,
 622                 const wxChar *szMsg)
 623 {
 624     // FIXME MT-unsafe
 625     static bool s_bInAssert = false;
 626
 627     if ( s_bInAssert )
 628     {
 629         // He-e-e-e-elp!! we're trapped in endless loop
 630         wxTrap();
 631
 632         s_bInAssert = false;
 633
 634         return;
 635     }
 636
 637     s_bInAssert = true;
 638
 639     // __FUNCTION__ is always in ASCII, convert it to wide char if needed
 640     const wxString strFunc = wxString::FromAscii(szFunc);
 641
 642     if ( !wxTheApp )
 643     {
 644         // by default, show the assert dialog box -- we can't customize this
 645         // behaviour
 646         ShowAssertDialog(szFile, nLine, strFunc, szCond, szMsg);
 647     }
 648     else
 649     {
 650         // let the app process it as it wants
 651         wxTheApp->OnAssertFailure(szFile, nLine, strFunc, szCond, szMsg);
 652     }
 653
 654     s_bInAssert = false;
 655 }
 656
 657 #endif // __WXDEBUG__
 658
 659 // ============================================================================
 660 // private functions implementation
 661 // ============================================================================
 662
 663 #ifdef __WXDEBUG__
 664
 665 static void LINKAGEMODE SetTraceMasks()
 666 {
 667 #if wxUSE_LOG
 668     wxString mask;
 669     if ( wxGetEnv(wxT("WXTRACE"), &mask) )
 670     {
 671         wxStringTokenizer tkn(mask, wxT(",;:"));
 672         while ( tkn.HasMoreTokens() )
 673             wxLog::AddTraceMask(tkn.GetNextToken());
 674     }
 675 #endif // wxUSE_LOG
 676 }
 677
 678 bool DoShowAssertDialog(const wxString& msg)
 679 {
 680     // under MSW we can show the dialog even in the console mode
 681 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 682     wxString msgDlg(msg);
 683
 684     // this message is intentionally not translated -- it is for
 685     // developpers only
 686     msgDlg += wxT("\nDo you want to stop the program?\n")
 687               wxT("You can also choose [Cancel] to suppress ")
 688               wxT("further warnings.");
 689
 690     switch ( ::MessageBox(NULL, msgDlg, _T("wxWidgets Debug Alert"),
 691                           MB_YESNOCANCEL | MB_ICONSTOP ) )
 692     {
 693         case IDYES:
 694             wxTrap();
 695             break;
 696
 697         case IDCANCEL:
 698             // stop the asserts
 699             return true;
 700
 701         //case IDNO: nothing to do
 702     }
 703 #else // !__WXMSW__
 704     wxFprintf(stderr, wxT("%s\n"), msg.c_str());
 705     fflush(stderr);
 706
 707     // TODO: ask the user to enter "Y" or "N" on the console?
 708     wxTrap();
 709 #endif // __WXMSW__/!__WXMSW__
 710
 711     // continue with the asserts
 712     return false;
 713 }
 714
 715 #if wxUSE_STACKWALKER
 716 static wxString GetAssertStackTrace()
 717 {
 718     wxString stackTrace;
 719
 720     class StackDump : public wxStackWalker
 721     {
 722     public:
 723         StackDump() { }
 724
 725         const wxString& GetStackTrace() const { return m_stackTrace; }
 726
 727     protected:
 728         virtual void OnStackFrame(const wxStackFrame& frame)
 729         {
 730             m_stackTrace << wxString::Format
 731                             (
 732                               _T("[%02d] "),
 733                               wx_truncate_cast(int, frame.GetLevel())
 734                             );
 735
 736             wxString name = frame.GetName();
 737             if ( !name.empty() )
 738             {
 739                 m_stackTrace << wxString::Format(_T("%-40s"), name.c_str());
 740             }
 741             else
 742             {
 743                 m_stackTrace << wxString::Format(_T("%p"), frame.GetAddress());
 744             }
 745
 746             if ( frame.HasSourceLocation() )
 747             {
 748                 m_stackTrace << _T('\t')
 749                              << frame.GetFileName()
 750                              << _T(':')
 751                              << frame.GetLine();
 752             }
 753
 754             m_stackTrace << _T('\n');
 755         }
 756
 757     private:
 758         wxString m_stackTrace;
 759     };
 760
 761     StackDump dump;
 762     dump.Walk(2); // don't show OnAssert() call itself
 763     stackTrace = dump.GetStackTrace();
 764
 765     // don't show more than maxLines or we could get a dialog too tall to be
 766     // shown on screen: 20 should be ok everywhere as even with 15 pixel high
 767     // characters it is still only 300 pixels...
 768     static const int maxLines = 20;
 769     const int count = stackTrace.Freq(wxT('\n'));
 770     for ( int i = 0; i < count - maxLines; i++ )
 771         stackTrace = stackTrace.BeforeLast(wxT('\n'));
 772
 773     return stackTrace;
 774 }
 775 #endif // wxUSE_STACKWALKER
 776
 777 // show the assert modal dialog
 778 static
 779 void ShowAssertDialog(const wxChar *szFile,
 780                       int nLine,
 781                       const wxChar *szFunc,
 782                       const wxChar *szCond,
 783                       const wxChar *szMsg,
 784                       wxAppTraits *traits)
 785 {
 786     // this variable can be set to true to suppress "assert failure" messages
 787     static bool s_bNoAsserts = false;
 788
 789     wxString msg;
 790     msg.reserve(2048);
 791
 792     // make life easier for people using VC++ IDE by using this format: like
 793     // this, clicking on the message will take us immediately to the place of
 794     // the failed assert
 795     msg.Printf(wxT("%s(%d): assert \"%s\" failed"), szFile, nLine, szCond);
 796
 797     // add the function name, if any
 798     if ( szFunc && *szFunc )
 799         msg << _T(" in ") << szFunc << _T("()");
 800
 801     // and the message itself
 802     if ( szMsg )
 803     {
 804         msg << _T(": ") << szMsg;
 805     }
 806     else // no message given
 807     {
 808         msg << _T('.');
 809     }
 810
 811 #if wxUSE_STACKWALKER
 812     const wxString stackTrace = GetAssertStackTrace();
 813     if ( !stackTrace.empty() )
 814     {
 815         msg << _T("\n\nCall stack:\n") << stackTrace;
 816     }
 817 #endif // wxUSE_STACKWALKER
 818
 819 #if wxUSE_THREADS
 820     // if we are not in the main thread, output the assert directly and trap
 821     // since dialogs cannot be displayed
 822     if ( !wxThread::IsMain() )
 823     {
 824         msg += wxT(" [in child thread]");
 825
 826 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 827         msg << wxT("\r\n");
 828         OutputDebugString(msg );
 829 #else
 830         // send to stderr
 831         wxFprintf(stderr, wxT("%s\n"), msg.c_str());
 832         fflush(stderr);
 833 #endif
 834         // He-e-e-e-elp!! we're asserting in a child thread
 835         wxTrap();
 836     }
 837     else
 838 #endif // wxUSE_THREADS
 839
 840     if ( !s_bNoAsserts )
 841     {
 842         // send it to the normal log destination
 843         wxLogDebug(_T("%s"), msg.c_str());
 844
 845         if ( traits )
 846         {
 847             // delegate showing assert dialog (if possible) to that class
 848             s_bNoAsserts = traits->ShowAssertDialog(msg);
 849         }
 850         else // no traits object
 851         {
 852             // fall back to the function of last resort
 853             s_bNoAsserts = DoShowAssertDialog(msg);
 854         }
 855     }
 856 }
 857
 858 #endif // __WXDEBUG__