src/msw/main.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/main.cpp
   3 // Purpose:     WinMain/DllMain
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  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/event.h"
  29     #include "wx/app.h"
  30     #include "wx/utils.h"
  31 #endif //WX_PRECOMP
  32
  33 #include "wx/cmdline.h"
  34 #include "wx/scopeguard.h"
  35
  36 #include "wx/msw/private.h"
  37 #include "wx/msw/seh.h"
  38
  39 #if wxUSE_ON_FATAL_EXCEPTION
  40     #include "wx/datetime.h"
  41     #include "wx/msw/crashrpt.h"
  42 #endif // wxUSE_ON_FATAL_EXCEPTION
  43
  44 #ifdef __WXWINCE__
  45     // there is no ExitProcess() under CE but exiting the main thread has the
  46     // same effect
  47     #ifndef ExitProcess
  48         #define ExitProcess ExitThread
  49     #endif
  50 #endif // __WXWINCE__
  51
  52 #ifdef __BORLANDC__
  53     // BC++ has to be special: its run-time expects the DLL entry point to be
  54     // named DllEntryPoint instead of the (more) standard DllMain
  55     #define DllMain DllEntryPoint
  56 #endif // __BORLANDC__
  57
  58 #if defined(__WXMICROWIN__)
  59     #define HINSTANCE HANDLE
  60 #endif
  61
  62 // defined in common/init.cpp
  63 extern int wxEntryReal(int& argc, wxChar **argv);
  64
  65 // ============================================================================
  66 // implementation: various entry points
  67 // ============================================================================
  68
  69 #if wxUSE_BASE
  70
  71 #if wxUSE_ON_FATAL_EXCEPTION && defined(__VISUALC__) && !defined(__WXWINCE__)
  72     // VC++ (at least from 4.0 up to version 7.1) is incredibly broken in that
  73     // a "catch ( ... )" will *always* catch SEH exceptions in it even though
  74     // it should have never been the case... to prevent such catches from
  75     // stealing the exceptions from our wxGlobalSEHandler which is only called
  76     // if the exception is not handled elsewhere, we have to also call it from
  77     // a special SEH translator function which is called by VC CRT when a Win32
  78     // exception occurs
  79
  80     // this warns that /EHa (async exceptions) should be used when using
  81     // _set_se_translator but, in fact, this doesn't seem to change anything
  82     // with VC++ up to 8.0
  83     #if _MSC_VER <= 1400
  84         #pragma warning(disable:4535)
  85     #endif
  86
  87     // note that the SE translator must be called wxSETranslator!
  88     #define DisableAutomaticSETranslator() _set_se_translator(wxSETranslator)
  89 #else // !__VISUALC__
  90     #define DisableAutomaticSETranslator()
  91 #endif // __VISUALC__/!__VISUALC__
  92
  93 // ----------------------------------------------------------------------------
  94 // wrapper wxEntry catching all Win32 exceptions occurring in a wx program
  95 // ----------------------------------------------------------------------------
  96
  97 // wrap real wxEntry in a try-except block to be able to call
  98 // OnFatalException() if necessary
  99 #if wxUSE_ON_FATAL_EXCEPTION
 100
 101 // global pointer to exception information, only valid inside OnFatalException,
 102 // used by wxStackWalker and wxCrashReport
 103 extern EXCEPTION_POINTERS *wxGlobalSEInformation = NULL;
 104
 105 // flag telling us whether the application wants to handle exceptions at all
 106 static bool gs_handleExceptions = false;
 107
 108 static void wxFatalExit()
 109 {
 110     // use the same exit code as abort()
 111     ::ExitProcess(3);
 112 }
 113
 114 unsigned long wxGlobalSEHandler(EXCEPTION_POINTERS *pExcPtrs)
 115 {
 116     if ( gs_handleExceptions && wxTheApp )
 117     {
 118         // store the pointer to exception info
 119         wxGlobalSEInformation = pExcPtrs;
 120
 121         // give the user a chance to do something special about this
 122         wxSEH_TRY
 123         {
 124             wxTheApp->OnFatalException();
 125         }
 126         wxSEH_IGNORE      // ignore any exceptions inside the exception handler
 127
 128         wxGlobalSEInformation = NULL;
 129
 130         // this will execute our handler and terminate the process
 131         return EXCEPTION_EXECUTE_HANDLER;
 132     }
 133
 134     return EXCEPTION_CONTINUE_SEARCH;
 135 }
 136
 137 #ifdef __VISUALC__
 138
 139 void wxSETranslator(unsigned int WXUNUSED(code), EXCEPTION_POINTERS *ep)
 140 {
 141     switch ( wxGlobalSEHandler(ep) )
 142     {
 143         default:
 144             wxFAIL_MSG( _T("unexpected wxGlobalSEHandler() return value") );
 145             // fall through
 146
 147         case EXCEPTION_EXECUTE_HANDLER:
 148             // if wxApp::OnFatalException() had been called we should exit the
 149             // application -- but we shouldn't kill our host when we're a DLL
 150 #ifndef WXMAKINGDLL
 151             wxFatalExit();
 152 #endif // not a DLL
 153             break;
 154
 155         case EXCEPTION_CONTINUE_SEARCH:
 156             // we're called for each "catch ( ... )" and if we (re)throw from
 157             // here, the catch handler body is not executed, so the effect is
 158             // as if had inhibited translation of SE to C++ ones because the
 159             // handler will never see any structured exceptions
 160             throw;
 161     }
 162 }
 163
 164 #endif // __VISUALC__
 165
 166 bool wxHandleFatalExceptions(bool doit)
 167 {
 168     // assume this can only be called from the main thread
 169     gs_handleExceptions = doit;
 170
 171 #if wxUSE_CRASHREPORT
 172     if ( doit )
 173     {
 174         // try to find a place where we can put out report file later
 175         wxChar fullname[MAX_PATH];
 176         if ( !::GetTempPath(WXSIZEOF(fullname), fullname) )
 177         {
 178             wxLogLastError(_T("GetTempPath"));
 179
 180             // when all else fails...
 181             wxStrcpy(fullname, _T("c:\\"));
 182         }
 183
 184         // use PID and date to make the report file name more unique
 185         wxString name = wxString::Format
 186                         (
 187                             _T("%s_%s_%lu.dmp"),
 188                             wxTheApp ? (const wxChar*)wxTheApp->GetAppName().c_str()
 189                                      : _T("wxwindows"),
 190                             wxDateTime::Now().Format(_T("%Y%m%dT%H%M%S")).c_str(),
 191                             ::GetCurrentProcessId()
 192                         );
 193
 194         wxStrncat(fullname, name, WXSIZEOF(fullname) - wxStrlen(fullname) - 1);
 195
 196         wxCrashReport::SetFileName(fullname);
 197     }
 198 #endif // wxUSE_CRASHREPORT
 199
 200     return true;
 201 }
 202
 203 int wxEntry(int& argc, wxChar **argv)
 204 {
 205     DisableAutomaticSETranslator();
 206
 207     wxSEH_TRY
 208     {
 209         return wxEntryReal(argc, argv);
 210     }
 211     wxSEH_HANDLE(-1)
 212 }
 213
 214 #else // !wxUSE_ON_FATAL_EXCEPTION
 215
 216 #if defined(__VISUALC__) && !defined(__WXWINCE__)
 217
 218 static void
 219 wxSETranslator(unsigned int WXUNUSED(code), EXCEPTION_POINTERS * WXUNUSED(ep))
 220 {
 221     // see wxSETranslator() version for wxUSE_ON_FATAL_EXCEPTION above
 222     throw;
 223 }
 224
 225 #endif // __VISUALC__
 226
 227 int wxEntry(int& argc, wxChar **argv)
 228 {
 229     DisableAutomaticSETranslator();
 230
 231     return wxEntryReal(argc, argv);
 232 }
 233
 234 #endif // wxUSE_ON_FATAL_EXCEPTION/!wxUSE_ON_FATAL_EXCEPTION
 235
 236 #endif // wxUSE_BASE
 237
 238 #if wxUSE_GUI && defined(__WXMSW__)
 239
 240 #if wxUSE_UNICODE && !defined(__WXWINCE__)
 241     #define NEED_UNICODE_CHECK
 242 #endif
 243
 244 #ifdef NEED_UNICODE_CHECK
 245
 246 // check whether Unicode is available
 247 static bool wxIsUnicodeAvailable()
 248 {
 249     static const wchar_t *ERROR_STRING = L"wxWidgets Fatal Error";
 250
 251     if ( wxGetOsVersion() != wxOS_WINDOWS_NT )
 252     {
 253         // we need to be built with MSLU support
 254 #if !wxUSE_UNICODE_MSLU
 255         // note that we can use MessageBoxW() as it's implemented even under
 256         // Win9x - OTOH, we can't use wxGetTranslation() because the file APIs
 257         // used by wxLocale are not
 258         ::MessageBox
 259         (
 260          NULL,
 261          L"This program uses Unicode and requires Windows NT/2000/XP.\n"
 262          L"\n"
 263          L"Program aborted.",
 264          ERROR_STRING,
 265          MB_ICONERROR | MB_OK
 266         );
 267
 268         return false;
 269 #else // wxUSE_UNICODE_MSLU
 270         // and the MSLU DLL must also be available
 271         HMODULE hmod = ::LoadLibraryA("unicows.dll");
 272         if ( !hmod )
 273         {
 274             ::MessageBox
 275             (
 276              NULL,
 277              L"This program uses Unicode and requires unicows.dll to work "
 278              L"under current operating system.\n"
 279              L"\n"
 280              L"Please install unicows.dll and relaunch the program.",
 281              ERROR_STRING,
 282              MB_ICONERROR | MB_OK
 283             );
 284             return false;
 285         }
 286
 287         // this is not really necessary but be tidy
 288         ::FreeLibrary(hmod);
 289
 290         // finally do the last check: has unicows.lib initialized correctly?
 291         hmod = ::LoadLibraryW(L"unicows.dll");
 292         if ( !hmod )
 293         {
 294             ::MessageBox
 295             (
 296              NULL,
 297              L"This program uses Unicode but is not using unicows.dll\n"
 298              L"correctly and so cannot work under current operating system.\n"
 299              L"Please contact the program author for an updated version.\n"
 300              L"\n"
 301              L"Program aborted.",
 302              ERROR_STRING,
 303              MB_ICONERROR | MB_OK
 304             );
 305
 306             return false;
 307         }
 308
 309         ::FreeLibrary(hmod);
 310 #endif // !wxUSE_UNICODE_MSLU
 311     }
 312
 313     return true;
 314 }
 315
 316 #endif // NEED_UNICODE_CHECK
 317
 318 // ----------------------------------------------------------------------------
 319 // Windows-specific wxEntry
 320 // ----------------------------------------------------------------------------
 321
 322 // helper function used to clean up in wxEntry() just below
 323 //
 324 // notice that argv elements are supposed to be allocated using malloc() while
 325 // argv array itself is allocated with new
 326 static void wxFreeArgs(int argc, wxChar **argv)
 327 {
 328     for ( int i = 0; i < argc; i++ )
 329     {
 330         free(argv[i]);
 331     }
 332
 333     delete [] argv;
 334 }
 335
 336 WXDLLEXPORT int wxEntry(HINSTANCE hInstance,
 337                         HINSTANCE WXUNUSED(hPrevInstance),
 338                         wxCmdLineArgType WXUNUSED(pCmdLine),
 339                         int nCmdShow)
 340 {
 341     // the first thing to do is to check if we're trying to run an Unicode
 342     // program under Win9x w/o MSLU emulation layer - if so, abort right now
 343     // as it has no chance to work and has all chances to crash
 344 #ifdef NEED_UNICODE_CHECK
 345     if ( !wxIsUnicodeAvailable() )
 346         return -1;
 347 #endif // NEED_UNICODE_CHECK
 348
 349
 350     // remember the parameters Windows gave us
 351     wxSetInstance(hInstance);
 352     wxApp::m_nCmdShow = nCmdShow;
 353
 354     // parse the command line: we can't use pCmdLine in Unicode build so it is
 355     // simpler to never use it at all (this also results in a more correct
 356     // argv[0])
 357
 358     // break the command line in words
 359     wxArrayString args;
 360
 361     const wxChar *cmdLine = ::GetCommandLine();
 362     if ( cmdLine )
 363     {
 364         args = wxCmdLineParser::ConvertStringToArgs(cmdLine);
 365     }
 366
 367 #ifdef __WXWINCE__
 368     // WinCE doesn't insert the program itself, so do it ourselves.
 369     args.Insert(wxGetFullModuleName(), 0);
 370 #endif
 371
 372     int argc = args.GetCount();
 373
 374     // +1 here for the terminating NULL
 375     wxChar **argv = new wxChar *[argc + 1];
 376     for ( int i = 0; i < argc; i++ )
 377     {
 378         argv[i] = wxStrdup(args[i]);
 379     }
 380
 381     // argv[] must be NULL-terminated
 382     argv[argc] = NULL;
 383
 384     wxON_BLOCK_EXIT2(wxFreeArgs, argc, argv);
 385
 386     return wxEntry(argc, argv);
 387 }
 388
 389 #endif // wxUSE_GUI && __WXMSW__
 390
 391 // ----------------------------------------------------------------------------
 392 // global HINSTANCE
 393 // ----------------------------------------------------------------------------
 394
 395 #if wxUSE_BASE
 396
 397 HINSTANCE wxhInstance = 0;
 398
 399 extern "C" HINSTANCE wxGetInstance()
 400 {
 401     return wxhInstance;
 402 }
 403
 404 void wxSetInstance(HINSTANCE hInst)
 405 {
 406     wxhInstance = hInst;
 407 }
 408
 409 #endif // wxUSE_BASE