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