src/common/init.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/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/filefn.h"
  29     #include "wx/log.h"
  30     #include "wx/intl.h"
  31     #include "wx/module.h"
  32 #endif
  33
  34 #include "wx/init.h"
  35 #include "wx/thread.h"
  36
  37 #include "wx/scopedptr.h"
  38 #include "wx/except.h"
  39
  40 #if defined(__WXMSW__) && defined(__WXDEBUG__)
  41     #include "wx/msw/msvcrt.h"
  42
  43     static struct EnableMemLeakChecking
  44     {
  45         EnableMemLeakChecking()
  46         {
  47             // do check for memory leaks on program exit (another useful flag
  48             // is _CRTDBG_DELAY_FREE_MEM_DF which doesn't free deallocated
  49             // memory which may be used to simulate low-memory condition)
  50             wxCrtSetDbgFlag(_CRTDBG_LEAK_CHECK_DF);
  51         }
  52     } gs_enableLeakChecks;
  53 #endif // __WXMSW__ && __WXDEBUG__
  54
  55 // ----------------------------------------------------------------------------
  56 // private classes
  57 // ----------------------------------------------------------------------------
  58
  59 // we need a dummy app object if the user doesn't want to create a real one
  60 class wxDummyConsoleApp : public wxAppConsole
  61 {
  62 public:
  63     wxDummyConsoleApp() { }
  64
  65     virtual int OnRun() { wxFAIL_MSG( _T("unreachable code") ); return 0; }
  66     virtual bool DoYield(bool, long) { return true; }
  67
  68     wxDECLARE_NO_COPY_CLASS(wxDummyConsoleApp);
  69 };
  70
  71 // we need a special kind of auto pointer to wxApp which not only deletes the
  72 // pointer it holds in its dtor but also resets the global application pointer
  73 wxDECLARE_SCOPED_PTR(wxAppConsole, wxAppPtrBase)
  74 wxDEFINE_SCOPED_PTR(wxAppConsole, wxAppPtrBase)
  75
  76 class wxAppPtr : public wxAppPtrBase
  77 {
  78 public:
  79     wxEXPLICIT wxAppPtr(wxAppConsole *ptr = NULL) : wxAppPtrBase(ptr) { }
  80     ~wxAppPtr()
  81     {
  82         if ( get() )
  83         {
  84             // the pointer is going to be deleted in the base class dtor, don't
  85             // leave the dangling pointer!
  86             wxApp::SetInstance(NULL);
  87         }
  88     }
  89
  90     void Set(wxAppConsole *ptr)
  91     {
  92         reset(ptr);
  93
  94         wxApp::SetInstance(ptr);
  95     }
  96
  97     wxDECLARE_NO_COPY_CLASS(wxAppPtr);
  98 };
  99
 100 // class to ensure that wxAppBase::CleanUp() is called if our Initialize()
 101 // fails
 102 class wxCallAppCleanup
 103 {
 104 public:
 105     wxCallAppCleanup(wxAppConsole *app) : m_app(app) { }
 106     ~wxCallAppCleanup() { if ( m_app ) m_app->CleanUp(); }
 107
 108     void Dismiss() { m_app = NULL; }
 109
 110 private:
 111     wxAppConsole *m_app;
 112 };
 113
 114 // another tiny class which simply exists to ensure that wxEntryCleanup is
 115 // always called
 116 class wxCleanupOnExit
 117 {
 118 public:
 119     ~wxCleanupOnExit() { wxEntryCleanup(); }
 120 };
 121
 122 // ----------------------------------------------------------------------------
 123 // private functions
 124 // ----------------------------------------------------------------------------
 125
 126 // suppress warnings about unused variables
 127 static inline void Use(void *) { }
 128
 129 #define WX_SUPPRESS_UNUSED_WARN(x) Use(&x)
 130
 131 // ----------------------------------------------------------------------------
 132 // initialization data
 133 // ----------------------------------------------------------------------------
 134
 135 static struct InitData
 136 {
 137     InitData()
 138     {
 139         nInitCount = 0;
 140
 141 #if wxUSE_UNICODE
 142         argc = 0;
 143         // argv = NULL; -- not even really needed
 144 #endif // wxUSE_UNICODE
 145     }
 146
 147     // critical section protecting this struct
 148     wxCRIT_SECT_DECLARE_MEMBER(csInit);
 149
 150     // number of times wxInitialize() was called minus the number of times
 151     // wxUninitialize() was
 152     size_t nInitCount;
 153
 154 #if wxUSE_UNICODE
 155     int argc;
 156
 157     // if we receive the command line arguments as ASCII and have to convert
 158     // them to Unicode ourselves (this is the case under Unix but not Windows,
 159     // for example), we remember the converted argv here because we'll have to
 160     // free it when doing cleanup to avoid memory leaks
 161     wchar_t **argv;
 162 #endif // wxUSE_UNICODE
 163
 164     wxDECLARE_NO_COPY_CLASS(InitData);
 165 } gs_initData;
 166
 167 // ============================================================================
 168 // implementation
 169 // ============================================================================
 170
 171 // ----------------------------------------------------------------------------
 172 // command line arguments ANSI -> Unicode conversion
 173 // ----------------------------------------------------------------------------
 174
 175 #if wxUSE_UNICODE
 176
 177 static void ConvertArgsToUnicode(int argc, char **argv)
 178 {
 179     gs_initData.argv = new wchar_t *[argc + 1];
 180     int wargc = 0;
 181     for ( int i = 0; i < argc; i++ )
 182     {
 183 #ifdef __DARWIN__
 184         wxWCharBuffer buf(wxConvFileName->cMB2WX(argv[i]));
 185 #else
 186         wxWCharBuffer buf(wxConvLocal.cMB2WX(argv[i]));
 187 #endif
 188         if ( !buf )
 189         {
 190             wxLogWarning(_("Command line argument %d couldn't be converted to Unicode and will be ignored."),
 191                          i);
 192         }
 193         else // converted ok
 194         {
 195             gs_initData.argv[wargc++] = wxStrdup(buf);
 196         }
 197     }
 198
 199     gs_initData.argc = wargc;
 200     gs_initData.argv[wargc] = NULL;
 201 }
 202
 203 static void FreeConvertedArgs()
 204 {
 205     if ( gs_initData.argv )
 206     {
 207         for ( int i = 0; i < gs_initData.argc; i++ )
 208         {
 209             free(gs_initData.argv[i]);
 210         }
 211
 212         delete [] gs_initData.argv;
 213         gs_initData.argv = NULL;
 214         gs_initData.argc = 0;
 215     }
 216 }
 217
 218 #endif // wxUSE_UNICODE
 219
 220 // ----------------------------------------------------------------------------
 221 // start up
 222 // ----------------------------------------------------------------------------
 223
 224 // initialization which is always done (not customizable) before wxApp creation
 225 static bool DoCommonPreInit()
 226 {
 227 #if wxUSE_LOG
 228     // Reset logging in case we were cleaned up and are being reinitialized.
 229     wxLog::DoCreateOnDemand();
 230
 231     // install temporary log sink: we can't use wxLogGui before wxApp is
 232     // constructed and if we use wxLogStderr, all messages during
 233     // initialization simply disappear under Windows
 234     //
 235     // note that we will delete this log target below
 236     delete wxLog::SetActiveTarget(new wxLogBuffer);
 237 #endif // wxUSE_LOG
 238
 239     return true;
 240 }
 241
 242 // non customizable initialization done after wxApp creation and initialization
 243 static bool DoCommonPostInit()
 244 {
 245     wxModule::RegisterModules();
 246
 247     if ( !wxModule::InitializeModules() )
 248     {
 249         wxLogError(_("Initialization failed in post init, aborting."));
 250         return false;
 251     }
 252
 253 #if defined(__WXDEBUG__)
 254     // check if event classes implement Clone() correctly
 255     // NOTE: the check is done against _all_ event classes which are linked to
 256     //       the executable currently running, which are not necessarily all
 257     //       wxWidgets event classes.
 258     const wxClassInfo *ci = wxClassInfo::GetFirst();
 259     for (; ci; ci = ci->GetNext())
 260     {
 261         // is this class derived from wxEvent?
 262         if (!ci->IsKindOf(CLASSINFO(wxEvent)) || wxString(ci->GetClassName()) == "wxEvent")
 263             continue;
 264
 265         if (!ci->IsDynamic())
 266         {
 267             wxLogWarning("The event class '%s' should have a DECLARE_DYNAMIC_CLASS macro!",
 268                          ci->GetClassName());
 269             continue;
 270         }
 271
 272         // yes; test if it implements Clone() correctly
 273         wxEvent* test = wxDynamicCast(ci->CreateObject(),wxEvent);
 274         if (test == NULL)
 275         {
 276             wxLogWarning("The event class '%s' should have a DECLARE_DYNAMIC_CLASS macro!",
 277                          ci->GetClassName());
 278             continue;
 279         }
 280
 281         wxEvent* cloned = test->Clone();
 282         if (!cloned || cloned->GetClassInfo() != ci)
 283             wxLogWarning("The event class '%s' does not correctly implement Clone()!",
 284                          ci->GetClassName());
 285
 286         delete cloned;
 287         delete test;
 288     }
 289 #endif
 290
 291     return true;
 292 }
 293
 294 bool wxEntryStart(int& argc, wxChar **argv)
 295 {
 296     // do minimal, always necessary, initialization
 297     // --------------------------------------------
 298
 299     // initialize wxRTTI
 300     if ( !DoCommonPreInit() )
 301         return false;
 302
 303
 304     // first of all, we need an application object
 305     // -------------------------------------------
 306
 307     // the user might have already created it himself somehow
 308     wxAppPtr app(wxTheApp);
 309     if ( !app.get() )
 310     {
 311         // if not, he might have used IMPLEMENT_APP() to give us a function to
 312         // create it
 313         wxAppInitializerFunction fnCreate = wxApp::GetInitializerFunction();
 314
 315         if ( fnCreate )
 316         {
 317             // he did, try to create the custom wxApp object
 318             app.Set((*fnCreate)());
 319         }
 320     }
 321
 322     if ( !app.get() )
 323     {
 324         // either IMPLEMENT_APP() was not used at all or it failed -- in any
 325         // case we still need something
 326         app.Set(new wxDummyConsoleApp);
 327     }
 328
 329
 330     // wxApp initialization: this can be customized
 331     // --------------------------------------------
 332
 333     if ( !app->Initialize(argc, argv) )
 334         return false;
 335
 336     // remember, possibly modified (e.g. due to removal of toolkit-specific
 337     // parameters), command line arguments in member variables
 338     app->argc = argc;
 339     app->argv = argv;
 340
 341     wxCallAppCleanup callAppCleanup(app.get());
 342
 343
 344     // common initialization after wxTheApp creation
 345     // ---------------------------------------------
 346
 347     if ( !DoCommonPostInit() )
 348         return false;
 349
 350
 351     // prevent the smart pointer from destroying its contents
 352     app.release();
 353
 354     // and the cleanup object from doing cleanup
 355     callAppCleanup.Dismiss();
 356
 357 #if wxUSE_LOG
 358     // now that we have a valid wxApp (wxLogGui would have crashed if we used
 359     // it before now), we can delete the temporary sink we had created for the
 360     // initialization messages -- the next time logging function is called, the
 361     // sink will be recreated but this time wxAppTraits will be used
 362     delete wxLog::SetActiveTarget(NULL);
 363 #endif // wxUSE_LOG
 364
 365     return true;
 366 }
 367
 368 #if wxUSE_UNICODE
 369
 370 // we provide a wxEntryStart() wrapper taking "char *" pointer too
 371 bool wxEntryStart(int& argc, char **argv)
 372 {
 373     ConvertArgsToUnicode(argc, argv);
 374
 375     if ( !wxEntryStart(gs_initData.argc, gs_initData.argv) )
 376     {
 377         FreeConvertedArgs();
 378
 379         return false;
 380     }
 381
 382     return true;
 383 }
 384
 385 #endif // wxUSE_UNICODE
 386
 387 // ----------------------------------------------------------------------------
 388 // clean up
 389 // ----------------------------------------------------------------------------
 390
 391 // cleanup done before destroying wxTheApp
 392 static void DoCommonPreCleanup()
 393 {
 394 #if wxUSE_LOG
 395     // flush the logged messages if any and install a 'safer' log target: the
 396     // default one (wxLogGui) can't be used after the resources are freed just
 397     // below and the user supplied one might be even more unsafe (using any
 398     // wxWidgets GUI function is unsafe starting from now)
 399     wxLog::DontCreateOnDemand();
 400
 401     // this will flush the old messages if any
 402     delete wxLog::SetActiveTarget(new wxLogStderr);
 403 #endif // wxUSE_LOG
 404 }
 405
 406 // cleanup done after destroying wxTheApp
 407 static void DoCommonPostCleanup()
 408 {
 409     wxModule::CleanUpModules();
 410
 411     // we can't do this in wxApp itself because it doesn't know if argv had
 412     // been allocated
 413 #if wxUSE_UNICODE
 414     FreeConvertedArgs();
 415 #endif // wxUSE_UNICODE
 416
 417     // use Set(NULL) and not Get() to avoid creating a message output object on
 418     // demand when we just want to delete it
 419     delete wxMessageOutput::Set(NULL);
 420
 421 #if wxUSE_LOG
 422     // and now delete the last logger as well
 423     delete wxLog::SetActiveTarget(NULL);
 424 #endif // wxUSE_LOG
 425 }
 426
 427 void wxEntryCleanup()
 428 {
 429     DoCommonPreCleanup();
 430
 431
 432     // delete the application object
 433     if ( wxTheApp )
 434     {
 435         wxTheApp->CleanUp();
 436
 437         // reset the global pointer to it to NULL before destroying it as in
 438         // some circumstances this can result in executing the code using
 439         // wxTheApp and using half-destroyed object is no good
 440         wxAppConsole * const app = wxApp::GetInstance();
 441         wxApp::SetInstance(NULL);
 442         delete app;
 443     }
 444
 445
 446     DoCommonPostCleanup();
 447 }
 448
 449 // ----------------------------------------------------------------------------
 450 // wxEntry
 451 // ----------------------------------------------------------------------------
 452
 453 // for MSW the real wxEntry is defined in msw/main.cpp
 454 #ifndef __WXMSW__
 455     #define wxEntryReal wxEntry
 456 #endif // !__WXMSW__
 457
 458 int wxEntryReal(int& argc, wxChar **argv)
 459 {
 460     // library initialization
 461     if ( !wxEntryStart(argc, argv) )
 462     {
 463 #if wxUSE_LOG
 464         // flush any log messages explaining why we failed
 465         delete wxLog::SetActiveTarget(NULL);
 466 #endif
 467         return -1;
 468     }
 469
 470     // if wxEntryStart succeeded, we must call wxEntryCleanup even if the code
 471     // below returns or throws
 472     wxCleanupOnExit cleanupOnExit;
 473
 474     WX_SUPPRESS_UNUSED_WARN(cleanupOnExit);
 475
 476     wxTRY
 477     {
 478         // app initialization
 479         if ( !wxTheApp->CallOnInit() )
 480         {
 481             // don't call OnExit() if OnInit() failed
 482             return -1;
 483         }
 484
 485         // ensure that OnExit() is called if OnInit() had succeeded
 486         class CallOnExit
 487         {
 488         public:
 489             ~CallOnExit() { wxTheApp->OnExit(); }
 490         } callOnExit;
 491
 492         WX_SUPPRESS_UNUSED_WARN(callOnExit);
 493
 494         // app execution
 495         return wxTheApp->OnRun();
 496     }
 497     wxCATCH_ALL( wxTheApp->OnUnhandledException(); return -1; )
 498 }
 499
 500 #if wxUSE_UNICODE
 501
 502 // as with wxEntryStart, we provide an ANSI wrapper
 503 int wxEntry(int& argc, char **argv)
 504 {
 505     ConvertArgsToUnicode(argc, argv);
 506
 507     return wxEntry(gs_initData.argc, gs_initData.argv);
 508 }
 509
 510 #endif // wxUSE_UNICODE
 511
 512 // ----------------------------------------------------------------------------
 513 // wxInitialize/wxUninitialize
 514 // ----------------------------------------------------------------------------
 515
 516 bool wxInitialize(int argc, wxChar **argv)
 517 {
 518     wxCRIT_SECT_LOCKER(lockInit, gs_initData.csInit);
 519
 520     if ( gs_initData.nInitCount++ )
 521     {
 522         // already initialized
 523         return true;
 524     }
 525
 526     return wxEntryStart(argc, argv);
 527 }
 528
 529 void wxUninitialize()
 530 {
 531     wxCRIT_SECT_LOCKER(lockInit, gs_initData.csInit);
 532
 533     if ( --gs_initData.nInitCount == 0 )
 534     {
 535         wxEntryCleanup();
 536     }
 537 }