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 *szFunc,
  97                           const wxChar *szCond,
  98                           const wxChar *szMsg,
  99                           wxAppTraits *traits = NULL);
 100
 101     // turn on the trace masks specified in the env variable WXTRACE
 102     static void LINKAGEMODE SetTraceMasks();
 103 #endif // __WXDEBUG__
 104
 105 // ----------------------------------------------------------------------------
 106 // global vars
 107 // ----------------------------------------------------------------------------
 108
 109 wxAppConsole *wxAppConsole::ms_appInstance = NULL;
 110
 111 wxAppInitializerFunction wxAppConsole::ms_appInitFn = NULL;
 112
 113 // ============================================================================
 114 // wxAppConsole implementation
 115 // ============================================================================
 116
 117 // ----------------------------------------------------------------------------
 118 // ctor/dtor
 119 // ----------------------------------------------------------------------------
 120
 121 wxAppConsole::wxAppConsole()
 122 {
 123     m_traits = NULL;
 124
 125     ms_appInstance = this;
 126
 127 #ifdef __WXDEBUG__
 128     SetTraceMasks();
 129 #if wxUSE_UNICODE
 130     // In unicode mode the SetTraceMasks call can cause an apptraits to be
 131     // created, but since we are still in the constructor the wrong kind will
 132     // be created for GUI apps.  Destroy it so it can be created again later.
 133     delete m_traits;
 134     m_traits = NULL;
 135 #endif
 136 #endif
 137 }
 138
 139 wxAppConsole::~wxAppConsole()
 140 {
 141     delete m_traits;
 142 }
 143
 144 // ----------------------------------------------------------------------------
 145 // initilization/cleanup
 146 // ----------------------------------------------------------------------------
 147
 148 bool wxAppConsole::Initialize(int& argcOrig, wxChar **argvOrig)
 149 {
 150     // remember the command line arguments
 151     argc = argcOrig;
 152     argv = argvOrig;
 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     return 0;
 212 }
 213
 214 void wxAppConsole::Exit()
 215 {
 216     exit(-1);
 217 }
 218
 219 // ----------------------------------------------------------------------------
 220 // traits stuff
 221 // ----------------------------------------------------------------------------
 222
 223 wxAppTraits *wxAppConsole::CreateTraits()
 224 {
 225     return new wxConsoleAppTraits;
 226 }
 227
 228 wxAppTraits *wxAppConsole::GetTraits()
 229 {
 230     // FIXME-MT: protect this with a CS?
 231     if ( !m_traits )
 232     {
 233         m_traits = CreateTraits();
 234
 235         wxASSERT_MSG( m_traits, _T("wxApp::CreateTraits() failed?") );
 236     }
 237
 238     return m_traits;
 239 }
 240
 241 // we must implement CreateXXX() in wxApp itself for backwards compatibility
 242 #if WXWIN_COMPATIBILITY_2_4
 243
 244 #if wxUSE_LOG
 245
 246 wxLog *wxAppConsole::CreateLogTarget()
 247 {
 248     wxAppTraits *traits = GetTraits();
 249     return traits ? traits->CreateLogTarget() : NULL;
 250 }
 251
 252 #endif // wxUSE_LOG
 253
 254 wxMessageOutput *wxAppConsole::CreateMessageOutput()
 255 {
 256     wxAppTraits *traits = GetTraits();
 257     return traits ? traits->CreateMessageOutput() : NULL;
 258 }
 259
 260 #endif // WXWIN_COMPATIBILITY_2_4
 261
 262 // ----------------------------------------------------------------------------
 263 // event processing
 264 // ----------------------------------------------------------------------------
 265
 266 void wxAppConsole::ProcessPendingEvents()
 267 {
 268 #if wxUSE_THREADS
 269     if ( !wxPendingEventsLocker )
 270         return;
 271 #endif
 272
 273     // ensure that we're the only thread to modify the pending events list
 274     wxENTER_CRIT_SECT( *wxPendingEventsLocker );
 275
 276     if ( !wxPendingEvents )
 277     {
 278         wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
 279         return;
 280     }
 281
 282     // iterate until the list becomes empty
 283     wxList::compatibility_iterator node = wxPendingEvents->GetFirst();
 284     while (node)
 285     {
 286         wxEvtHandler *handler = (wxEvtHandler *)node->GetData();
 287         wxPendingEvents->Erase(node);
 288
 289         // In ProcessPendingEvents(), new handlers might be add
 290         // and we can safely leave the critical section here.
 291         wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
 292
 293         handler->ProcessPendingEvents();
 294
 295         wxENTER_CRIT_SECT( *wxPendingEventsLocker );
 296
 297         node = wxPendingEvents->GetFirst();
 298     }
 299
 300     wxLEAVE_CRIT_SECT( *wxPendingEventsLocker );
 301 }
 302
 303 int wxAppConsole::FilterEvent(wxEvent& WXUNUSED(event))
 304 {
 305     // process the events normally by default
 306     return -1;
 307 }
 308
 309 // ----------------------------------------------------------------------------
 310 // exception handling
 311 // ----------------------------------------------------------------------------
 312
 313 #if wxUSE_EXCEPTIONS
 314
 315 void
 316 wxAppConsole::HandleEvent(wxEvtHandler *handler,
 317                           wxEventFunction func,
 318                           wxEvent& event) const
 319 {
 320     // by default, simply call the handler
 321     (handler->*func)(event);
 322 }
 323
 324 #endif // wxUSE_EXCEPTIONS
 325
 326 // ----------------------------------------------------------------------------
 327 // cmd line parsing
 328 // ----------------------------------------------------------------------------
 329
 330 #if wxUSE_CMDLINE_PARSER
 331
 332 #define OPTION_VERBOSE _T("verbose")
 333
 334 void wxAppConsole::OnInitCmdLine(wxCmdLineParser& parser)
 335 {
 336     // the standard command line options
 337     static const wxCmdLineEntryDesc cmdLineDesc[] =
 338     {
 339         {
 340             wxCMD_LINE_SWITCH,
 341             _T("h"),
 342             _T("help"),
 343             gettext_noop("show this help message"),
 344             wxCMD_LINE_VAL_NONE,
 345             wxCMD_LINE_OPTION_HELP
 346         },
 347
 348 #if wxUSE_LOG
 349         {
 350             wxCMD_LINE_SWITCH,
 351             wxEmptyString,
 352             OPTION_VERBOSE,
 353             gettext_noop("generate verbose log messages"),
 354             wxCMD_LINE_VAL_NONE,
 355             0x0
 356         },
 357 #endif // wxUSE_LOG
 358
 359         // terminator
 360         {
 361             wxCMD_LINE_NONE,
 362             wxEmptyString,
 363             wxEmptyString,
 364             wxEmptyString,
 365             wxCMD_LINE_VAL_NONE,
 366             0x0
 367         }
 368     };
 369
 370     parser.SetDesc(cmdLineDesc);
 371 }
 372
 373 bool wxAppConsole::OnCmdLineParsed(wxCmdLineParser& parser)
 374 {
 375 #if wxUSE_LOG
 376     if ( parser.Found(OPTION_VERBOSE) )
 377     {
 378         wxLog::SetVerbose(true);
 379     }
 380 #else
 381     wxUnusedVar(parser);
 382 #endif // wxUSE_LOG
 383
 384     return true;
 385 }
 386
 387 bool wxAppConsole::OnCmdLineHelp(wxCmdLineParser& parser)
 388 {
 389     parser.Usage();
 390
 391     return false;
 392 }
 393
 394 bool wxAppConsole::OnCmdLineError(wxCmdLineParser& parser)
 395 {
 396     parser.Usage();
 397
 398     return false;
 399 }
 400
 401 #endif // wxUSE_CMDLINE_PARSER
 402
 403 // ----------------------------------------------------------------------------
 404 // debugging support
 405 // ----------------------------------------------------------------------------
 406
 407 /* static */
 408 bool wxAppConsole::CheckBuildOptions(const char *optionsSignature,
 409                                      const char *componentName)
 410 {
 411 #if 0 // can't use wxLogTrace, not up and running yet
 412     printf("checking build options object '%s' (ptr %p) in '%s'\n",
 413              optionsSignature, optionsSignature, componentName);
 414 #endif
 415
 416     if ( strcmp(optionsSignature, WX_BUILD_OPTIONS_SIGNATURE) != 0 )
 417     {
 418         wxString lib = wxString::FromAscii(WX_BUILD_OPTIONS_SIGNATURE);
 419         wxString prog = wxString::FromAscii(optionsSignature);
 420         wxString progName = wxString::FromAscii(componentName);
 421         wxString msg;
 422
 423         msg.Printf(_T("Mismatch between the program and library build versions detected.\nThe library used %s,\nand %s used %s."),
 424                    lib.c_str(), progName.c_str(), prog.c_str());
 425
 426         wxLogFatalError(msg.c_str());
 427
 428         // normally wxLogFatalError doesn't return
 429         return false;
 430     }
 431 #undef wxCMP
 432
 433     return true;
 434 }
 435
 436 #ifdef __WXDEBUG__
 437
 438 void wxAppConsole::OnAssertFailure(const wxChar *file,
 439                                    int line,
 440                                    const wxChar *func,
 441                                    const wxChar *cond,
 442                                    const wxChar *msg)
 443 {
 444     ShowAssertDialog(file, line, func, cond, msg, GetTraits());
 445 }
 446
 447 void wxAppConsole::OnAssert(const wxChar *file,
 448                             int line,
 449                             const wxChar *cond,
 450                             const wxChar *msg)
 451 {
 452     OnAssertFailure(file, line, _T(""), cond, msg);
 453 }
 454
 455 #endif // __WXDEBUG__
 456
 457 #if WXWIN_COMPATIBILITY_2_4
 458
 459 bool wxAppConsole::CheckBuildOptions(const wxBuildOptions& buildOptions)
 460 {
 461     return CheckBuildOptions(buildOptions.m_signature, "your program");
 462 }
 463
 464 #endif
 465
 466 // ============================================================================
 467 // other classes implementations
 468 // ============================================================================
 469
 470 // ----------------------------------------------------------------------------
 471 // wxConsoleAppTraitsBase
 472 // ----------------------------------------------------------------------------
 473
 474 #if wxUSE_LOG
 475
 476 wxLog *wxConsoleAppTraitsBase::CreateLogTarget()
 477 {
 478     return new wxLogStderr;
 479 }
 480
 481 #endif // wxUSE_LOG
 482
 483 wxMessageOutput *wxConsoleAppTraitsBase::CreateMessageOutput()
 484 {
 485     return new wxMessageOutputStderr;
 486 }
 487
 488 #if wxUSE_FONTMAP
 489
 490 wxFontMapper *wxConsoleAppTraitsBase::CreateFontMapper()
 491 {
 492     return (wxFontMapper *)new wxFontMapperBase;
 493 }
 494
 495 #endif // wxUSE_FONTMAP
 496
 497 wxRendererNative *wxConsoleAppTraitsBase::CreateRenderer()
 498 {
 499     // console applications don't use renderers
 500     return NULL;
 501 }
 502
 503 #ifdef __WXDEBUG__
 504 bool wxConsoleAppTraitsBase::ShowAssertDialog(const wxString& msg)
 505 {
 506     return wxAppTraitsBase::ShowAssertDialog(msg);
 507 }
 508 #endif
 509
 510 bool wxConsoleAppTraitsBase::HasStderr()
 511 {
 512     // console applications always have stderr, even under Mac/Windows
 513     return true;
 514 }
 515
 516 void wxConsoleAppTraitsBase::ScheduleForDestroy(wxObject *object)
 517 {
 518     delete object;
 519 }
 520
 521 void wxConsoleAppTraitsBase::RemoveFromPendingDelete(wxObject * WXUNUSED(object))
 522 {
 523     // nothing to do
 524 }
 525
 526 #if wxUSE_SOCKETS
 527 GSocketGUIFunctionsTable* wxConsoleAppTraitsBase::GetSocketGUIFunctionsTable()
 528 {
 529     return NULL;
 530 }
 531 #endif
 532
 533 // ----------------------------------------------------------------------------
 534 // wxAppTraits
 535 // ----------------------------------------------------------------------------
 536
 537 #ifdef __WXDEBUG__
 538
 539 bool wxAppTraitsBase::ShowAssertDialog(const wxString& msg)
 540 {
 541     return DoShowAssertDialog(msg);
 542 }
 543
 544 #endif // __WXDEBUG__
 545
 546 // ============================================================================
 547 // global functions implementation
 548 // ============================================================================
 549
 550 void wxExit()
 551 {
 552     if ( wxTheApp )
 553     {
 554         wxTheApp->Exit();
 555     }
 556     else
 557     {
 558         // what else can we do?
 559         exit(-1);
 560     }
 561 }
 562
 563 void wxWakeUpIdle()
 564 {
 565     if ( wxTheApp )
 566     {
 567         wxTheApp->WakeUpIdle();
 568     }
 569     //else: do nothing, what can we do?
 570 }
 571
 572 #ifdef  __WXDEBUG__
 573
 574 // wxASSERT() helper
 575 bool wxAssertIsEqual(int x, int y)
 576 {
 577     return x == y;
 578 }
 579
 580 // break into the debugger
 581 void wxTrap()
 582 {
 583 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 584     DebugBreak();
 585 #elif defined(__WXMAC__) && !defined(__DARWIN__)
 586     #if __powerc
 587         Debugger();
 588     #else
 589         SysBreak();
 590     #endif
 591 #elif defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
 592     Debugger();
 593 #elif defined(__UNIX__)
 594     raise(SIGTRAP);
 595 #else
 596     // TODO
 597 #endif // Win/Unix
 598 }
 599
 600 // this function is called when an assert fails
 601 void wxOnAssert(const wxChar *szFile,
 602                 int nLine,
 603                 const wxChar *szFunc,
 604                 const wxChar *szCond,
 605                 const wxChar *szMsg)
 606 {
 607     // FIXME MT-unsafe
 608     static bool s_bInAssert = false;
 609
 610     if ( s_bInAssert )
 611     {
 612         // He-e-e-e-elp!! we're trapped in endless loop
 613         wxTrap();
 614
 615         s_bInAssert = false;
 616
 617         return;
 618     }
 619
 620     s_bInAssert = true;
 621
 622     if ( !wxTheApp )
 623     {
 624         // by default, show the assert dialog box -- we can't customize this
 625         // behaviour
 626         ShowAssertDialog(szFile, nLine, szFunc, szCond, szMsg);
 627     }
 628     else
 629     {
 630         // let the app process it as it wants
 631         wxTheApp->OnAssertFailure(szFile, nLine, szFunc, szCond, szMsg);
 632     }
 633
 634     s_bInAssert = false;
 635 }
 636
 637 #endif // __WXDEBUG__
 638
 639 // ============================================================================
 640 // private functions implementation
 641 // ============================================================================
 642
 643 #ifdef __WXDEBUG__
 644
 645 static void LINKAGEMODE SetTraceMasks()
 646 {
 647 #if wxUSE_LOG
 648     wxString mask;
 649     if ( wxGetEnv(wxT("WXTRACE"), &mask) )
 650     {
 651         wxStringTokenizer tkn(mask, wxT(",;:"));
 652         while ( tkn.HasMoreTokens() )
 653             wxLog::AddTraceMask(tkn.GetNextToken());
 654     }
 655 #endif // wxUSE_LOG
 656 }
 657
 658 bool DoShowAssertDialog(const wxString& msg)
 659 {
 660     // under MSW we can show the dialog even in the console mode
 661 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 662     wxString msgDlg(msg);
 663
 664     // this message is intentionally not translated -- it is for
 665     // developpers only
 666     msgDlg += wxT("\nDo you want to stop the program?\n")
 667               wxT("You can also choose [Cancel] to suppress ")
 668               wxT("further warnings.");
 669
 670     switch ( ::MessageBox(NULL, msgDlg, _T("wxWidgets Debug Alert"),
 671                           MB_YESNOCANCEL | MB_ICONSTOP ) )
 672     {
 673         case IDYES:
 674             wxTrap();
 675             break;
 676
 677         case IDCANCEL:
 678             // stop the asserts
 679             return true;
 680
 681         //case IDNO: nothing to do
 682     }
 683 #else // !__WXMSW__
 684     wxFprintf(stderr, wxT("%s\n"), msg.c_str());
 685     fflush(stderr);
 686
 687     // TODO: ask the user to enter "Y" or "N" on the console?
 688     wxTrap();
 689 #endif // __WXMSW__/!__WXMSW__
 690
 691     // continue with the asserts
 692     return false;
 693 }
 694
 695 #if wxUSE_STACKWALKER
 696 static wxString GetAssertStackTrace()
 697 {
 698     wxString stackTrace;
 699
 700     class StackDump : public wxStackWalker
 701     {
 702     public:
 703         StackDump() { }
 704
 705         const wxString& GetStackTrace() const { return m_stackTrace; }
 706
 707     protected:
 708         virtual void OnStackFrame(const wxStackFrame& frame)
 709         {
 710             m_stackTrace << wxString::Format
 711                             (
 712                               _T("[%02d] "),
 713                               wx_truncate_cast(int, frame.GetLevel())
 714                             );
 715
 716             wxString name = frame.GetName();
 717             if ( !name.empty() )
 718             {
 719                 m_stackTrace << wxString::Format(_T("%-40s"), name.c_str());
 720             }
 721             else
 722             {
 723                 m_stackTrace << wxString::Format(_T("%p"), frame.GetAddress());
 724             }
 725
 726             if ( frame.HasSourceLocation() )
 727             {
 728                 m_stackTrace << _T('\t')
 729                              << frame.GetFileName()
 730                              << _T(':')
 731                              << frame.GetLine();
 732             }
 733
 734             m_stackTrace << _T('\n');
 735         }
 736
 737     private:
 738         wxString m_stackTrace;
 739     };
 740
 741     StackDump dump;
 742     dump.Walk(5); // don't show OnAssert() call itself
 743     stackTrace = dump.GetStackTrace();
 744
 745     // don't show more than maxLines or we could get a dialog too tall to be
 746     // shown on screen: 20 should be ok everywhere as even with 15 pixel high
 747     // characters it is still only 300 pixels...
 748     static const int maxLines = 20;
 749     const int count = stackTrace.Freq(wxT('\n'));
 750     for ( int i = 0; i < count - maxLines; i++ )
 751         stackTrace = stackTrace.BeforeLast(wxT('\n'));
 752
 753     return stackTrace;
 754 }
 755 #endif // wxUSE_STACKWALKER
 756
 757 // show the assert modal dialog
 758 static
 759 void ShowAssertDialog(const wxChar *szFile,
 760                       int nLine,
 761                       const wxChar *szFunc,
 762                       const wxChar *szCond,
 763                       const wxChar *szMsg,
 764                       wxAppTraits *traits)
 765 {
 766     // this variable can be set to true to suppress "assert failure" messages
 767     static bool s_bNoAsserts = false;
 768
 769     wxString msg;
 770     msg.reserve(2048);
 771
 772     // make life easier for people using VC++ IDE by using this format: like
 773     // this, clicking on the message will take us immediately to the place of
 774     // the failed assert
 775     msg.Printf(wxT("%s(%d): assert \"%s\" failed"), szFile, nLine, szCond);
 776
 777     // add the function name, if any
 778     if ( szFunc && *szFunc )
 779         msg << _T(" in ") << szFunc << _T("()");
 780
 781     // and the message itself
 782     if ( szMsg )
 783     {
 784         msg << _T(": ") << szMsg;
 785     }
 786     else // no message given
 787     {
 788         msg << _T('.');
 789     }
 790
 791 #if wxUSE_STACKWALKER
 792     const wxString stackTrace = GetAssertStackTrace();
 793     if ( !stackTrace.empty() )
 794     {
 795         msg << _T("\n\nCall stack:\n") << stackTrace;
 796     }
 797 #endif // wxUSE_STACKWALKER
 798
 799 #if wxUSE_THREADS
 800     // if we are not in the main thread, output the assert directly and trap
 801     // since dialogs cannot be displayed
 802     if ( !wxThread::IsMain() )
 803     {
 804         msg += wxT(" [in child thread]");
 805
 806 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 807         msg << wxT("\r\n");
 808         OutputDebugString(msg );
 809 #else
 810         // send to stderr
 811         wxFprintf(stderr, wxT("%s\n"), msg.c_str());
 812         fflush(stderr);
 813 #endif
 814         // He-e-e-e-elp!! we're asserting in a child thread
 815         wxTrap();
 816     }
 817     else
 818 #endif // wxUSE_THREADS
 819
 820     if ( !s_bNoAsserts )
 821     {
 822         // send it to the normal log destination
 823         wxLogDebug(_T("%s"), msg.c_str());
 824
 825         if ( traits )
 826         {
 827             // delegate showing assert dialog (if possible) to that class
 828             s_bNoAsserts = traits->ShowAssertDialog(msg);
 829         }
 830         else // no traits object
 831         {
 832             // fall back to the function of last resort
 833             s_bNoAsserts = DoShowAssertDialog(msg);
 834         }
 835     }
 836 }
 837
 838 #endif // __WXDEBUG__
 839