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 // ----------------------------------------------------------------------------
 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 #endif // wxUSE_EXCEPTIONS
 324
 325 // ----------------------------------------------------------------------------
 326 // cmd line parsing
 327 // ----------------------------------------------------------------------------
 328
 329 #if wxUSE_CMDLINE_PARSER
 330
 331 #define OPTION_VERBOSE _T("verbose")
 332
 333 void wxAppConsole::OnInitCmdLine(wxCmdLineParser& parser)
 334 {
 335     // the standard command line options
 336     static const wxCmdLineEntryDesc cmdLineDesc[] =
 337     {
 338         {
 339             wxCMD_LINE_SWITCH,
 340             _T("h"),
 341             _T("help"),
 342             gettext_noop("show this help message"),
 343             wxCMD_LINE_VAL_NONE,
 344             wxCMD_LINE_OPTION_HELP
 345         },
 346
 347 #if wxUSE_LOG
 348         {
 349             wxCMD_LINE_SWITCH,
 350             wxEmptyString,
 351             OPTION_VERBOSE,
 352             gettext_noop("generate verbose log messages"),
 353             wxCMD_LINE_VAL_NONE,
 354             0x0
 355         },
 356 #endif // wxUSE_LOG
 357
 358         // terminator
 359         {
 360             wxCMD_LINE_NONE,
 361             wxEmptyString,
 362             wxEmptyString,
 363             wxEmptyString,
 364             wxCMD_LINE_VAL_NONE,
 365             0x0
 366         }
 367     };
 368
 369     parser.SetDesc(cmdLineDesc);
 370 }
 371
 372 bool wxAppConsole::OnCmdLineParsed(wxCmdLineParser& parser)
 373 {
 374 #if wxUSE_LOG
 375     if ( parser.Found(OPTION_VERBOSE) )
 376     {
 377         wxLog::SetVerbose(true);
 378     }
 379 #else
 380     wxUnusedVar(parser);
 381 #endif // wxUSE_LOG
 382
 383     return true;
 384 }
 385
 386 bool wxAppConsole::OnCmdLineHelp(wxCmdLineParser& parser)
 387 {
 388     parser.Usage();
 389
 390     return false;
 391 }
 392
 393 bool wxAppConsole::OnCmdLineError(wxCmdLineParser& parser)
 394 {
 395     parser.Usage();
 396
 397     return false;
 398 }
 399
 400 #endif // wxUSE_CMDLINE_PARSER
 401
 402 // ----------------------------------------------------------------------------
 403 // debugging support
 404 // ----------------------------------------------------------------------------
 405
 406 /* static */
 407 bool wxAppConsole::CheckBuildOptions(const char *optionsSignature,
 408                                      const char *componentName)
 409 {
 410 #if 0 // can't use wxLogTrace, not up and running yet
 411     printf("checking build options object '%s' (ptr %p) in '%s'\n",
 412              optionsSignature, optionsSignature, componentName);
 413 #endif
 414
 415     if ( strcmp(optionsSignature, WX_BUILD_OPTIONS_SIGNATURE) != 0 )
 416     {
 417         wxString lib = wxString::FromAscii(WX_BUILD_OPTIONS_SIGNATURE);
 418         wxString prog = wxString::FromAscii(optionsSignature);
 419         wxString progName = wxString::FromAscii(componentName);
 420         wxString msg;
 421
 422         msg.Printf(_T("Mismatch between the program and library build versions detected.\nThe library used %s,\nand %s used %s."),
 423                    lib.c_str(), progName.c_str(), prog.c_str());
 424
 425         wxLogFatalError(msg.c_str());
 426
 427         // normally wxLogFatalError doesn't return
 428         return false;
 429     }
 430 #undef wxCMP
 431
 432     return true;
 433 }
 434
 435 #ifdef __WXDEBUG__
 436
 437 void wxAppConsole::OnAssertFailure(const wxChar *file,
 438                                    int line,
 439                                    const wxChar *func,
 440                                    const wxChar *cond,
 441                                    const wxChar *msg)
 442 {
 443     ShowAssertDialog(file, line, func, cond, msg, GetTraits());
 444 }
 445
 446 void wxAppConsole::OnAssert(const wxChar *file,
 447                             int line,
 448                             const wxChar *cond,
 449                             const wxChar *msg)
 450 {
 451     OnAssertFailure(file, line, NULL, cond, msg);
 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& msgOriginal)
 539 {
 540     wxString msg = msgOriginal;
 541
 542 #if wxUSE_STACKWALKER
 543 #if !defined(__WXMSW__)
 544     // on Unix stack frame generation may take some time, depending on the
 545     // size of the executable mainly... warn the user that we are working
 546     wxFprintf(stderr, wxT("[Debug] Generating a stack trace... please wait"));
 547     fflush(stderr);
 548 #endif
 549
 550     const wxString stackTrace = GetAssertStackTrace();
 551     if ( !stackTrace.empty() )
 552         msg << _T("\n\nCall stack:\n") << stackTrace;
 553 #endif // wxUSE_STACKWALKER
 554
 555     return DoShowAssertDialog(msg);
 556 }
 557
 558 #if wxUSE_STACKWALKER
 559 wxString wxAppTraitsBase::GetAssertStackTrace()
 560 {
 561     wxString stackTrace;
 562
 563     class StackDump : public wxStackWalker
 564     {
 565     public:
 566         StackDump() { }
 567
 568         const wxString& GetStackTrace() const { return m_stackTrace; }
 569
 570     protected:
 571         virtual void OnStackFrame(const wxStackFrame& frame)
 572         {
 573             m_stackTrace << wxString::Format
 574                             (
 575                               _T("[%02d] "),
 576                               wx_truncate_cast(int, frame.GetLevel())
 577                             );
 578
 579             wxString name = frame.GetName();
 580             if ( !name.empty() )
 581             {
 582                 m_stackTrace << wxString::Format(_T("%-40s"), name.c_str());
 583             }
 584             else
 585             {
 586                 m_stackTrace << wxString::Format(_T("%p"), frame.GetAddress());
 587             }
 588
 589             if ( frame.HasSourceLocation() )
 590             {
 591                 m_stackTrace << _T('\t')
 592                              << frame.GetFileName()
 593                              << _T(':')
 594                              << frame.GetLine();
 595             }
 596
 597             m_stackTrace << _T('\n');
 598         }
 599
 600     private:
 601         wxString m_stackTrace;
 602     };
 603
 604     // don't show more than maxLines or we could get a dialog too tall to be
 605     // shown on screen: 20 should be ok everywhere as even with 15 pixel high
 606     // characters it is still only 300 pixels...
 607     static const int maxLines = 20;
 608
 609     StackDump dump;
 610     dump.Walk(2, maxLines); // don't show OnAssert() call itself
 611     stackTrace = dump.GetStackTrace();
 612
 613     const int count = stackTrace.Freq(wxT('\n'));
 614     for ( int i = 0; i < count - maxLines; i++ )
 615         stackTrace = stackTrace.BeforeLast(wxT('\n'));
 616
 617     return stackTrace;
 618 }
 619 #endif // wxUSE_STACKWALKER
 620
 621
 622 #endif // __WXDEBUG__
 623
 624 // ============================================================================
 625 // global functions implementation
 626 // ============================================================================
 627
 628 void wxExit()
 629 {
 630     if ( wxTheApp )
 631     {
 632         wxTheApp->Exit();
 633     }
 634     else
 635     {
 636         // what else can we do?
 637         exit(-1);
 638     }
 639 }
 640
 641 void wxWakeUpIdle()
 642 {
 643     if ( wxTheApp )
 644     {
 645         wxTheApp->WakeUpIdle();
 646     }
 647     //else: do nothing, what can we do?
 648 }
 649
 650 #ifdef  __WXDEBUG__
 651
 652 // wxASSERT() helper
 653 bool wxAssertIsEqual(int x, int y)
 654 {
 655     return x == y;
 656 }
 657
 658 // break into the debugger
 659 void wxTrap()
 660 {
 661 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 662     DebugBreak();
 663 #elif defined(__WXMAC__) && !defined(__DARWIN__)
 664     #if __powerc
 665         Debugger();
 666     #else
 667         SysBreak();
 668     #endif
 669 #elif defined(_MSL_USING_MW_C_HEADERS) && _MSL_USING_MW_C_HEADERS
 670     Debugger();
 671 #elif defined(__UNIX__)
 672     raise(SIGTRAP);
 673 #else
 674     // TODO
 675 #endif // Win/Unix
 676 }
 677
 678 // this function is called when an assert fails
 679 void wxOnAssert(const wxChar *szFile,
 680                 int nLine,
 681                 const char *szFunc,
 682                 const wxChar *szCond,
 683                 const wxChar *szMsg)
 684 {
 685     // FIXME MT-unsafe
 686     static bool s_bInAssert = false;
 687
 688     if ( s_bInAssert )
 689     {
 690         // He-e-e-e-elp!! we're trapped in endless loop
 691         wxTrap();
 692
 693         s_bInAssert = false;
 694
 695         return;
 696     }
 697
 698     s_bInAssert = true;
 699
 700     // __FUNCTION__ is always in ASCII, convert it to wide char if needed
 701     const wxString strFunc = wxString::FromAscii(szFunc);
 702
 703     if ( !wxTheApp )
 704     {
 705         // by default, show the assert dialog box -- we can't customize this
 706         // behaviour
 707         ShowAssertDialog(szFile, nLine, strFunc, szCond, szMsg);
 708     }
 709     else
 710     {
 711         // let the app process it as it wants
 712         wxTheApp->OnAssertFailure(szFile, nLine, strFunc, szCond, szMsg);
 713     }
 714
 715     s_bInAssert = false;
 716 }
 717
 718 #endif // __WXDEBUG__
 719
 720 // ============================================================================
 721 // private functions implementation
 722 // ============================================================================
 723
 724 #ifdef __WXDEBUG__
 725
 726 static void LINKAGEMODE SetTraceMasks()
 727 {
 728 #if wxUSE_LOG
 729     wxString mask;
 730     if ( wxGetEnv(wxT("WXTRACE"), &mask) )
 731     {
 732         wxStringTokenizer tkn(mask, wxT(",;:"));
 733         while ( tkn.HasMoreTokens() )
 734             wxLog::AddTraceMask(tkn.GetNextToken());
 735     }
 736 #endif // wxUSE_LOG
 737 }
 738
 739 bool DoShowAssertDialog(const wxString& msg)
 740 {
 741     // under MSW we can show the dialog even in the console mode
 742 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 743     wxString msgDlg(msg);
 744
 745     // this message is intentionally not translated -- it is for
 746     // developpers only
 747     msgDlg += wxT("\nDo you want to stop the program?\n")
 748               wxT("You can also choose [Cancel] to suppress ")
 749               wxT("further warnings.");
 750
 751     switch ( ::MessageBox(NULL, msgDlg, _T("wxWidgets Debug Alert"),
 752                           MB_YESNOCANCEL | MB_ICONSTOP ) )
 753     {
 754         case IDYES:
 755             wxTrap();
 756             break;
 757
 758         case IDCANCEL:
 759             // stop the asserts
 760             return true;
 761
 762         //case IDNO: nothing to do
 763     }
 764 #else // !__WXMSW__
 765     wxFprintf(stderr, wxT("%s\n"), msg.c_str());
 766     fflush(stderr);
 767
 768     // TODO: ask the user to enter "Y" or "N" on the console?
 769     wxTrap();
 770 #endif // __WXMSW__/!__WXMSW__
 771
 772     // continue with the asserts
 773     return false;
 774 }
 775
 776 // show the assert modal dialog
 777 static
 778 void ShowAssertDialog(const wxChar *szFile,
 779                       int nLine,
 780                       const wxChar *szFunc,
 781                       const wxChar *szCond,
 782                       const wxChar *szMsg,
 783                       wxAppTraits *traits)
 784 {
 785     // this variable can be set to true to suppress "assert failure" messages
 786     static bool s_bNoAsserts = false;
 787
 788     wxString msg;
 789     msg.reserve(2048);
 790
 791     // make life easier for people using VC++ IDE by using this format: like
 792     // this, clicking on the message will take us immediately to the place of
 793     // the failed assert
 794     msg.Printf(wxT("%s(%d): assert \"%s\" failed"), szFile, nLine, szCond);
 795
 796     // add the function name, if any
 797     if ( szFunc && *szFunc )
 798         msg << _T(" in ") << szFunc << _T("()");
 799
 800     // and the message itself
 801     if ( szMsg )
 802     {
 803         msg << _T(": ") << szMsg;
 804     }
 805     else // no message given
 806     {
 807         msg << _T('.');
 808     }
 809
 810 #if wxUSE_THREADS
 811     // if we are not in the main thread, output the assert directly and trap
 812     // since dialogs cannot be displayed
 813     if ( !wxThread::IsMain() )
 814     {
 815         msg += wxT(" [in child thread]");
 816
 817 #if defined(__WXMSW__) && !defined(__WXMICROWIN__)
 818         msg << wxT("\r\n");
 819         OutputDebugString(msg );
 820 #else
 821         // send to stderr
 822         wxFprintf(stderr, wxT("%s\n"), msg.c_str());
 823         fflush(stderr);
 824 #endif
 825         // He-e-e-e-elp!! we're asserting in a child thread
 826         wxTrap();
 827     }
 828     else
 829 #endif // wxUSE_THREADS
 830
 831     if ( !s_bNoAsserts )
 832     {
 833         // send it to the normal log destination
 834         wxLogDebug(_T("%s"), msg.c_str());
 835
 836         if ( traits )
 837         {
 838             // delegate showing assert dialog (if possible) to that class
 839             s_bNoAsserts = traits->ShowAssertDialog(msg);
 840         }
 841         else // no traits object
 842         {
 843             // fall back to the function of last resort
 844             s_bNoAsserts = DoShowAssertDialog(msg);
 845         }
 846     }
 847 }
 848
 849 #endif // __WXDEBUG__