src/common/init.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        common/init.cpp
   3 // Purpose:     initialisation for the library
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     04.10.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Vadim Zeitlin
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #include "wx/wxprec.h"
  21
  22 #ifdef    __BORLANDC__
  23   #pragma hdrstop
  24 #endif  //__BORLANDC__
  25
  26 #ifndef WX_PRECOMP
  27     #include "wx/app.h"
  28     #include "wx/debug.h"
  29     #include "wx/filefn.h"
  30     #include "wx/log.h"
  31     #include "wx/thread.h"
  32 #endif
  33
  34 #include "wx/init.h"
  35
  36 #include "wx/ptr_scpd.h"
  37 #include "wx/module.h"
  38
  39 #if defined(__WXMSW__) && defined(__WXDEBUG__)
  40     #include "wx/msw/msvcrt.h"
  41
  42     static struct EnableMemLeakChecking
  43     {
  44         EnableMemLeakChecking()
  45         {
  46             // do check for memory leaks on program exit (another useful flag
  47             // is _CRTDBG_DELAY_FREE_MEM_DF which doesn't free deallocated
  48             // memory which may be used to simulate low-memory condition)
  49             wxCrtSetDbgFlag(_CRTDBG_LEAK_CHECK_DF);
  50         }
  51     } gs_enableLeakChecks;
  52 #endif // __WXMSW__ && __WXDEBUG__
  53
  54 // ----------------------------------------------------------------------------
  55 // private classes
  56 // ----------------------------------------------------------------------------
  57
  58 // we need a dummy app object if the user doesn't want to create a real one
  59 class wxDummyConsoleApp : public wxAppConsole
  60 {
  61 public:
  62     wxDummyConsoleApp() { }
  63
  64     virtual int OnRun() { wxFAIL_MSG( _T("unreachable code") ); return 0; }
  65
  66     DECLARE_NO_COPY_CLASS(wxDummyConsoleApp)
  67 };
  68
  69 // we need a special kind of auto pointer to wxApp which not only deletes the
  70 // pointer it holds in its dtor but also resets the global application pointer
  71 wxDECLARE_SCOPED_PTR(wxApp, wxAppPtrBase);
  72 wxDEFINE_SCOPED_PTR(wxApp, wxAppPtrBase);
  73
  74 class wxAppPtr : public wxAppPtrBase
  75 {
  76 public:
  77     wxEXPLICIT wxAppPtr(wxApp *ptr = NULL) : wxAppPtrBase(ptr) { }
  78     ~wxAppPtr()
  79     {
  80         if ( get() )
  81         {
  82             // the pointer is going to be deleted in the base class dtor, don't
  83             // leave the dangling pointer!
  84             wxTheApp = NULL;
  85         }
  86     }
  87
  88     void Set(wxApp *ptr)
  89     {
  90         reset(ptr);
  91
  92         wxTheApp = ptr;
  93     }
  94
  95     DECLARE_NO_COPY_CLASS(wxAppPtr)
  96 };
  97
  98 // class to ensure that wxAppBase::CleanUp() is called if our Initialize()
  99 // fails
 100 class wxCallAppCleanup
 101 {
 102 public:
 103     wxCallAppCleanup(wxApp *app) : m_app(app) { }
 104     ~wxCallAppCleanup() { if ( m_app ) m_app->CleanUp(); }
 105
 106     void Dismiss() { m_app = NULL; }
 107
 108 private:
 109     wxApp *m_app;
 110 };
 111
 112 // another tiny class which simply exists to ensure that wxEntryCleanup is
 113 // always called
 114 class wxCleanupOnExit
 115 {
 116 public:
 117     ~wxCleanupOnExit() { wxEntryCleanup(); }
 118 };
 119
 120 // ----------------------------------------------------------------------------
 121 // private functions
 122 // ----------------------------------------------------------------------------
 123
 124 // suppress warnings about unused variables
 125 static inline void Use(void *) { }
 126
 127 #define WX_SUPPRESS_UNUSED_WARN(x) Use(&x)
 128
 129 // ----------------------------------------------------------------------------
 130 // initialization data
 131 // ----------------------------------------------------------------------------
 132
 133 static struct InitData
 134 {
 135     InitData()
 136     {
 137         nInitCount = 0;
 138
 139 #if wxUSE_UNICODE
 140         argc = 0;
 141         // argv = NULL; -- not even really needed
 142 #endif // wxUSE_UNICODE
 143     }
 144
 145     // critical section protecting this struct
 146     wxCRIT_SECT_DECLARE_MEMBER(csInit);
 147
 148     // number of times wxInitialize() was called minus the number of times
 149     // wxUninitialize() was
 150     size_t nInitCount;
 151
 152 #if wxUSE_UNICODE
 153     int argc;
 154
 155     // if we receive the command line arguments as ASCII and have to convert
 156     // them to Unicode ourselves (this is the case under Unix but not Windows,
 157     // for example), we remember the converted argv here because we'll have to
 158     // free it when doing cleanup to avoid memory leaks
 159     wchar_t **argv;
 160 #endif // wxUSE_UNICODE
 161
 162     DECLARE_NO_COPY_CLASS(InitData)
 163 } gs_initData;
 164
 165 // ============================================================================
 166 // implementation
 167 // ============================================================================
 168
 169 // ----------------------------------------------------------------------------
 170 // command line arguments ANSI -> Unicode conversion
 171 // ----------------------------------------------------------------------------
 172
 173 #if wxUSE_UNICODE
 174
 175 static void ConvertArgsToUnicode(int argc, char **argv)
 176 {
 177     gs_initData.argv = new wchar_t *[argc + 1];
 178     for ( int i = 0; i < argc; i++ )
 179     {
 180         gs_initData.argv[i] = wxStrdup(wxConvLocal.cMB2WX(argv[i]));
 181     }
 182
 183     gs_initData.argv[argc] = NULL;
 184 }
 185
 186 static void FreeConvertedArgs()
 187 {
 188     if ( gs_initData.argv )
 189     {
 190         for ( int i = 0; i < gs_initData.argc; i++ )
 191         {
 192             free(gs_initData.argv[i]);
 193         }
 194
 195         delete [] gs_initData.argv;
 196         gs_initData.argv = NULL;
 197     }
 198 }
 199
 200 #endif // wxUSE_UNICODE
 201
 202 // ----------------------------------------------------------------------------
 203 // start up
 204 // ----------------------------------------------------------------------------
 205
 206 // initialization which is always done (not customizable) before wxApp creation
 207 static bool DoCommonPreInit()
 208 {
 209     wxClassInfo::InitializeClasses();
 210
 211     return true;
 212 }
 213
 214 // non customizable initialization done after wxApp creation and initialization
 215 static bool DoCommonPostInit()
 216 {
 217     wxModule::RegisterModules();
 218
 219     return wxModule::InitializeModules();
 220 }
 221
 222 bool wxEntryStart(int& argc, wxChar **argv)
 223 {
 224     // do minimal, always necessary, initialization
 225     // --------------------------------------------
 226
 227     // initialize wxRTTI
 228     if ( !DoCommonPreInit() )
 229     {
 230         return false;
 231     }
 232
 233
 234     // first of all, we need an application object
 235     // -------------------------------------------
 236
 237     // the user might have already created it himself somehow
 238     wxAppPtr app(wxTheApp);
 239     if ( !app.get() )
 240     {
 241         // if not, he might have used IMPLEMENT_APP() to give us a function to
 242         // create it
 243         wxAppInitializerFunction fnCreate = wxApp::GetInitializerFunction();
 244
 245         if ( fnCreate )
 246         {
 247             // he did, try to create the custom wxApp object
 248             app.Set((*fnCreate)());
 249         }
 250     }
 251
 252     if ( !app.get() )
 253     {
 254         // either IMPLEMENT_APP() was not used at all or it failed -- in any
 255         // case we still need something
 256         app.Set(new wxDummyConsoleApp);
 257     }
 258
 259
 260     // wxApp initialization: this can be customized
 261     // --------------------------------------------
 262
 263     if ( !app->Initialize(argc, argv) )
 264     {
 265         return false;
 266     }
 267
 268     wxCallAppCleanup callAppCleanup(app.get());
 269
 270     // for compatibility call the old initialization function too
 271     if ( !app->OnInitGui() )
 272         return false;
 273
 274
 275     // common initialization after wxTheApp creation
 276     // ---------------------------------------------
 277
 278     if ( !DoCommonPostInit() )
 279         return false;
 280
 281
 282     // prevent the smart pointer from destroying its contents
 283     app.release();
 284
 285     // and the cleanup object from doing cleanup
 286     callAppCleanup.Dismiss();
 287
 288     return true;
 289 }
 290
 291 #if wxUSE_UNICODE
 292
 293 // we provide a wxEntryStart() wrapper taking "char *" pointer too
 294 bool wxEntryStart(int& argc, char **argv)
 295 {
 296     ConvertArgsToUnicode(argc, argv);
 297
 298     if ( !wxEntryStart(argc, gs_initData.argv) )
 299     {
 300         FreeConvertedArgs();
 301
 302         return false;
 303     }
 304
 305     return true;
 306 }
 307
 308 #endif // wxUSE_UNICODE
 309
 310 // ----------------------------------------------------------------------------
 311 // clean up
 312 // ----------------------------------------------------------------------------
 313
 314 // cleanup done before destroying wxTheApp
 315 static void DoCommonPreCleanup()
 316 {
 317 #if wxUSE_LOG
 318     // flush the logged messages if any and install a 'safer' log target: the
 319     // default one (wxLogGui) can't be used after the resources are freed just
 320     // below and the user supplied one might be even more unsafe (using any
 321     // wxWindows GUI function is unsafe starting from now)
 322     wxLog::DontCreateOnDemand();
 323
 324     // this will flush the old messages if any
 325     delete wxLog::SetActiveTarget(new wxLogStderr);
 326 #endif // wxUSE_LOG
 327
 328     wxModule::CleanUpModules();
 329 }
 330
 331 // cleanup done after destroying wxTheApp
 332 static void DoCommonPostCleanup()
 333 {
 334     wxClassInfo::CleanUpClasses();
 335
 336     // we can't do this in wxApp itself because it doesn't know if argv had
 337     // been allocated
 338 #if wxUSE_UNICODE
 339     FreeConvertedArgs();
 340 #endif // wxUSE_UNICODE
 341
 342 #if wxUSE_LOG
 343     // and now delete the last logger as well
 344     delete wxLog::SetActiveTarget(NULL);
 345 #endif // wxUSE_LOG
 346 }
 347
 348 void wxEntryCleanup()
 349 {
 350     DoCommonPreCleanup();
 351
 352
 353     // delete the application object
 354     if ( wxTheApp )
 355     {
 356         wxTheApp->CleanUp();
 357
 358         delete wxTheApp;
 359         wxTheApp = NULL;
 360     }
 361
 362
 363     DoCommonPostCleanup();
 364
 365     // check for memory leaks
 366 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 367     if (wxDebugContext::CountObjectsLeft(TRUE) > 0)
 368     {
 369         wxLogDebug(wxT("There were memory leaks.\n"));
 370         wxDebugContext::Dump();
 371         wxDebugContext::PrintStatistics();
 372     }
 373 #endif // Debug
 374
 375 }
 376
 377 // ----------------------------------------------------------------------------
 378 // wxEntry
 379 // ----------------------------------------------------------------------------
 380
 381 #if !defined(__WXMSW__) || !wxUSE_ON_FATAL_EXCEPTION
 382     #define wxEntryReal wxEntry
 383 #endif // !(__WXMSW__ && wxUSE_ON_FATAL_EXCEPTION)
 384
 385 int wxEntryReal(int& argc, wxChar **argv)
 386 {
 387     // library initialization
 388     if ( !wxEntryStart(argc, argv) )
 389     {
 390         return -1;
 391     }
 392
 393     // if wxEntryStart succeeded, we must call wxEntryCleanup even if the code
 394     // below returns or throws
 395     wxCleanupOnExit cleanupOnExit;
 396
 397     WX_SUPPRESS_UNUSED_WARN(cleanupOnExit);
 398
 399     // app initialization
 400     if ( !wxTheApp->CallOnInit() )
 401     {
 402         // don't call OnExit() if OnInit() failed
 403         return -1;
 404     }
 405
 406     // app execution
 407     int retValue = wxTheApp->OnRun();
 408
 409     // app clean up
 410     wxTheApp->OnExit();
 411
 412     return retValue;
 413 }
 414
 415 // wrap real wxEntry in a try-except block to be able to call
 416 // OnFatalException() if necessary
 417 #if defined(__WXMSW__) && wxUSE_ON_FATAL_EXCEPTION
 418
 419 #ifdef __WXWINCE__
 420 // For ExitThread
 421 #include "wx/msw/private.h"
 422 #endif
 423
 424 extern unsigned long wxGlobalSEHandler(EXCEPTION_POINTERS *pExcPtrs);
 425
 426 int wxEntry(int& argc, wxChar **argv)
 427 {
 428     __try
 429     {
 430         return wxEntryReal(argc, argv);
 431     }
 432     __except ( wxGlobalSEHandler(GetExceptionInformation()) )
 433     {
 434 #ifdef __WXWINCE__
 435         ::ExitThread(3); // the same exit code as abort()
 436 #else
 437         ::ExitProcess(3); // the same exit code as abort()
 438 #endif
 439
 440 #if !defined(_MSC_VER) || _MSC_VER < 1300
 441         // this code is unreachable but put it here to suppress warnings
 442         // from some compilers
 443         return -1;
 444 #endif
 445     }
 446 }
 447
 448 #endif // __WXMSW__ && wxUSE_ON_FATAL_EXCEPTION
 449
 450 #if wxUSE_UNICODE
 451
 452 // as with wxEntryStart, we provide an ANSI wrapper
 453 int wxEntry(int& argc, char **argv)
 454 {
 455     ConvertArgsToUnicode(argc, argv);
 456
 457     return wxEntry(argc, gs_initData.argv);
 458 }
 459
 460 #endif // wxUSE_UNICODE
 461
 462 // ----------------------------------------------------------------------------
 463 // wxInitialize/wxUninitialize
 464 // ----------------------------------------------------------------------------
 465
 466 bool wxInitialize(int argc, wxChar **argv)
 467 {
 468     wxCRIT_SECT_LOCKER(lockInit, gs_initData.csInit);
 469
 470     if ( gs_initData.nInitCount++ )
 471     {
 472         // already initialized
 473         return true;
 474     }
 475
 476     return wxEntryStart(argc, argv);
 477 }
 478
 479 void wxUninitialize()
 480 {
 481     wxCRIT_SECT_LOCKER(lockInit, gs_initData.csInit);
 482
 483     if ( !--gs_initData.nInitCount )
 484     {
 485         wxEntryCleanup();
 486     }
 487 }
 488