src/msw/app.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/app.cpp
   3 // Purpose:     wxApp
   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 #if defined(__BORLANDC__)
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/msw/wrapcctl.h"
  29     #include "wx/dynarray.h"
  30     #include "wx/frame.h"
  31     #include "wx/app.h"
  32     #include "wx/utils.h"
  33     #include "wx/gdicmn.h"
  34     #include "wx/pen.h"
  35     #include "wx/brush.h"
  36     #include "wx/cursor.h"
  37     #include "wx/icon.h"
  38     #include "wx/palette.h"
  39     #include "wx/dc.h"
  40     #include "wx/dialog.h"
  41     #include "wx/msgdlg.h"
  42     #include "wx/intl.h"
  43     #include "wx/crt.h"
  44     #include "wx/log.h"
  45     #include "wx/module.h"
  46 #endif
  47
  48 #include "wx/apptrait.h"
  49 #include "wx/filename.h"
  50 #include "wx/dynlib.h"
  51 #include "wx/evtloop.h"
  52 #include "wx/thread.h"
  53 #include "wx/scopeguard.h"
  54 #include "wx/vector.h"
  55
  56 #include "wx/msw/private.h"
  57 #include "wx/msw/dc.h"
  58 #include "wx/msw/ole/oleutils.h"
  59 #include "wx/msw/private/timer.h"
  60
  61 #if wxUSE_TOOLTIPS
  62     #include "wx/tooltip.h"
  63 #endif // wxUSE_TOOLTIPS
  64
  65 // OLE is used for drag-and-drop, clipboard, OLE Automation..., but some
  66 // compilers don't support it (missing headers, libs, ...)
  67 #if defined(__GNUWIN32_OLD__) || defined(__SYMANTEC__)
  68     #undef wxUSE_OLE
  69
  70     #define  wxUSE_OLE 0
  71 #endif // broken compilers
  72
  73 #if defined(__POCKETPC__) || defined(__SMARTPHONE__)
  74     #include <ole2.h>
  75     #include <aygshell.h>
  76 #endif
  77
  78 #if wxUSE_OLE
  79     #include <ole2.h>
  80 #endif
  81
  82 #include <string.h>
  83 #include <ctype.h>
  84
  85 #include "wx/msw/missing.h"
  86
  87 // instead of including <shlwapi.h> which is not part of the core SDK and not
  88 // shipped at all with other compilers, we always define the parts of it we
  89 // need here ourselves
  90 //
  91 // NB: DLLVER_PLATFORM_WINDOWS will be defined if shlwapi.h had been somehow
  92 //     included already
  93 #ifndef DLLVER_PLATFORM_WINDOWS
  94     // hopefully we don't need to change packing as DWORDs should be already
  95     // correctly aligned
  96     struct DLLVERSIONINFO
  97     {
  98         DWORD cbSize;
  99         DWORD dwMajorVersion;                   // Major version
 100         DWORD dwMinorVersion;                   // Minor version
 101         DWORD dwBuildNumber;                    // Build number
 102         DWORD dwPlatformID;                     // DLLVER_PLATFORM_*
 103     };
 104
 105     typedef HRESULT (CALLBACK* DLLGETVERSIONPROC)(DLLVERSIONINFO *);
 106 #endif // defined(DLLVERSIONINFO)
 107
 108 #ifndef ATTACH_PARENT_PROCESS
 109     #define ATTACH_PARENT_PROCESS ((DWORD)-1)
 110 #endif
 111
 112 // ---------------------------------------------------------------------------
 113 // global variables
 114 // ---------------------------------------------------------------------------
 115
 116 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
 117 extern void wxSetKeyboardHook(bool doIt);
 118 #endif
 119
 120 // because of mingw32 4.3 bug this struct can't be inside the namespace below:
 121 // see http://article.gmane.org/gmane.comp.lib.wxwidgets.devel/110282
 122 struct ClassRegInfo
 123 {
 124     // the base name of the class: this is used to construct the unique name in
 125     // wxApp::GetRegisteredClassName()
 126     wxString basename;
 127
 128     // the name of the registered class with and without CS_[HV]REDRAW styles
 129     wxString regname,
 130              regnameNR;
 131 };
 132
 133 namespace
 134 {
 135
 136 wxVector<ClassRegInfo> gs_regClassesInfo;
 137
 138 } // anonymous namespace
 139
 140 // ----------------------------------------------------------------------------
 141 // private functions
 142 // ----------------------------------------------------------------------------
 143
 144 LRESULT WXDLLEXPORT APIENTRY wxWndProc(HWND, UINT, WPARAM, LPARAM);
 145
 146 // ===========================================================================
 147 // wxGUIAppTraits implementation
 148 // ===========================================================================
 149
 150 // private class which we use to pass parameters from BeforeChildWaitLoop() to
 151 // AfterChildWaitLoop()
 152 struct ChildWaitLoopData
 153 {
 154     ChildWaitLoopData(wxWindowDisabler *wd_, wxWindow *winActive_)
 155     {
 156         wd = wd_;
 157         winActive = winActive_;
 158     }
 159
 160     wxWindowDisabler *wd;
 161     wxWindow *winActive;
 162 };
 163
 164 void *wxGUIAppTraits::BeforeChildWaitLoop()
 165 {
 166     /*
 167        We use a dirty hack here to disable all application windows (which we
 168        must do because otherwise the calls to wxYield() could lead to some very
 169        unexpected reentrancies in the users code) but to avoid losing
 170        focus/activation entirely when the child process terminates which would
 171        happen if we simply disabled everything using wxWindowDisabler. Indeed,
 172        remember that Windows will never activate a disabled window and when the
 173        last childs window is closed and Windows looks for a window to activate
 174        all our windows are still disabled. There is no way to enable them in
 175        time because we don't know when the childs windows are going to be
 176        closed, so the solution we use here is to keep one special tiny frame
 177        enabled all the time. Then when the child terminates it will get
 178        activated and when we close it below -- after reenabling all the other
 179        windows! -- the previously active window becomes activated again and
 180        everything is ok.
 181      */
 182     wxBeginBusyCursor();
 183
 184     // first disable all existing windows
 185     wxWindowDisabler *wd = new wxWindowDisabler;
 186
 187     // then create an "invisible" frame: it has minimal size, is positioned
 188     // (hopefully) outside the screen and doesn't appear on the taskbar
 189     wxWindow *winActive = new wxFrame
 190                     (
 191                         wxTheApp->GetTopWindow(),
 192                         wxID_ANY,
 193                         wxEmptyString,
 194                         wxPoint(32600, 32600),
 195                         wxSize(1, 1),
 196                         wxDEFAULT_FRAME_STYLE | wxFRAME_NO_TASKBAR
 197                     );
 198     winActive->Show();
 199
 200     return new ChildWaitLoopData(wd, winActive);
 201 }
 202
 203 void wxGUIAppTraits::AlwaysYield()
 204 {
 205     wxYield();
 206 }
 207
 208 void wxGUIAppTraits::AfterChildWaitLoop(void *dataOrig)
 209 {
 210     wxEndBusyCursor();
 211
 212     ChildWaitLoopData * const data = (ChildWaitLoopData *)dataOrig;
 213
 214     delete data->wd;
 215
 216     // finally delete the dummy frame and, as wd has been already destroyed and
 217     // the other windows reenabled, the activation is going to return to the
 218     // window which had had it before
 219     data->winActive->Destroy();
 220
 221     // also delete the temporary data object itself
 222     delete data;
 223 }
 224
 225 bool wxGUIAppTraits::DoMessageFromThreadWait()
 226 {
 227     // we should return false only if the app should exit, i.e. only if
 228     // Dispatch() determines that the main event loop should terminate
 229     wxEventLoopBase * const evtLoop = wxEventLoop::GetActive();
 230     if ( !evtLoop || !evtLoop->Pending() )
 231     {
 232         // no events means no quit event
 233         return true;
 234     }
 235
 236     return evtLoop->Dispatch();
 237 }
 238
 239 DWORD wxGUIAppTraits::WaitForThread(WXHANDLE hThread)
 240 {
 241     // if we don't have a running event loop, we shouldn't wait for the
 242     // messages as we never remove them from the message queue and so we enter
 243     // an infinite loop as MsgWaitForMultipleObjects() keeps returning
 244     // WAIT_OBJECT_0 + 1
 245     if ( !wxEventLoop::GetActive() )
 246         return DoSimpleWaitForThread(hThread);
 247
 248     return ::MsgWaitForMultipleObjects
 249              (
 250                1,                   // number of objects to wait for
 251                (HANDLE *)&hThread,  // the objects
 252                false,               // wait for any objects, not all
 253                INFINITE,            // no timeout
 254                QS_ALLINPUT |        // return as soon as there are any events
 255                QS_ALLPOSTMESSAGE
 256              );
 257 }
 258
 259 wxPortId wxGUIAppTraits::GetToolkitVersion(int *majVer, int *minVer) const
 260 {
 261     OSVERSIONINFO info;
 262     wxZeroMemory(info);
 263
 264     // on Windows, the toolkit version is the same of the OS version
 265     // as Windows integrates the OS kernel with the GUI toolkit.
 266     info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
 267     if ( ::GetVersionEx(&info) )
 268     {
 269         if ( majVer )
 270             *majVer = info.dwMajorVersion;
 271         if ( minVer )
 272             *minVer = info.dwMinorVersion;
 273     }
 274
 275 #if defined(__WXHANDHELD__) || defined(__WXWINCE__)
 276     return wxPORT_WINCE;
 277 #else
 278     return wxPORT_MSW;
 279 #endif
 280 }
 281
 282 #if wxUSE_TIMER
 283
 284 wxTimerImpl *wxGUIAppTraits::CreateTimerImpl(wxTimer *timer)
 285 {
 286     return new wxMSWTimerImpl(timer);
 287 }
 288
 289 #endif // wxUSE_TIMER
 290
 291 wxEventLoopBase* wxGUIAppTraits::CreateEventLoop()
 292 {
 293     return new wxEventLoop;
 294 }
 295
 296 // ---------------------------------------------------------------------------
 297 // Stuff for using console from the GUI applications
 298 // ---------------------------------------------------------------------------
 299
 300 #ifndef __WXWINCE__
 301
 302 #include <wx/dynlib.h>
 303
 304 namespace
 305 {
 306
 307 /*
 308     Helper class to manipulate console from a GUI app.
 309
 310     Notice that console output is available in the GUI app only if:
 311     - AttachConsole() returns TRUE (which means it never works under pre-XP)
 312     - we have a valid STD_ERROR_HANDLE
 313     - command history hasn't been changed since our startup
 314
 315     To check if all these conditions are verified, you need to simple call
 316     IsOkToUse(). It will check the first two conditions above the first time it
 317     is called (and if this fails, the subsequent calls will return immediately)
 318     and also recheck the last one every time it is called.
 319  */
 320 class wxConsoleStderr
 321 {
 322 public:
 323     // default ctor does nothing, call Init() before using this class
 324     wxConsoleStderr()
 325     {
 326         m_hStderr = INVALID_HANDLE_VALUE;
 327         m_historyLen =
 328         m_dataLen =
 329         m_dataLine = 0;
 330
 331         m_ok = -1;
 332     }
 333
 334     ~wxConsoleStderr()
 335     {
 336         if ( m_hStderr != INVALID_HANDLE_VALUE )
 337         {
 338             if ( !::FreeConsole() )
 339             {
 340                 wxLogLastError(_T("FreeConsole"));
 341             }
 342         }
 343     }
 344
 345     // return true if we were successfully initialized and there had been no
 346     // console activity which would interfere with our output since then
 347     bool IsOkToUse() const
 348     {
 349         if ( m_ok == -1 )
 350         {
 351             wxConsoleStderr * const self = const_cast<wxConsoleStderr *>(this);
 352             self->m_ok = self->DoInit();
 353
 354             // no need to call IsHistoryUnchanged() as we just initialized
 355             // m_history anyhow
 356             return m_ok == 1;
 357         }
 358
 359         return m_ok && IsHistoryUnchanged();
 360     }
 361
 362
 363     // output the provided text on the console, return true if ok
 364     bool Write(const wxString& text);
 365
 366 private:
 367     // called by Init() once only to do the real initialization
 368     bool DoInit();
 369
 370     // retrieve the command line history into the provided buffer and return
 371     // its length
 372     int GetCommandHistory(wxWxCharBuffer& buf) const;
 373
 374     // check if the console history has changed
 375     bool IsHistoryUnchanged() const;
 376
 377     int m_ok;                   // initially -1, set to true or false by Init()
 378
 379     wxDynamicLibrary m_dllKernel32;
 380
 381     HANDLE m_hStderr;           // console handle, if it's valid we must call
 382                                 // FreeConsole() (even if m_ok != 1)
 383
 384     wxWxCharBuffer m_history;   // command history on startup
 385     int m_historyLen;           // length command history buffer
 386
 387     wxCharBuffer m_data;        // data between empty line and cursor position
 388     int m_dataLen;              // length data buffer
 389     int m_dataLine;             // line offset
 390
 391     typedef DWORD (WINAPI *GetConsoleCommandHistory_t)(LPTSTR sCommands,
 392                                                        DWORD nBufferLength,
 393                                                        LPCTSTR sExeName);
 394     typedef DWORD (WINAPI *GetConsoleCommandHistoryLength_t)(LPCTSTR sExeName);
 395
 396     GetConsoleCommandHistory_t m_pfnGetConsoleCommandHistory;
 397     GetConsoleCommandHistoryLength_t m_pfnGetConsoleCommandHistoryLength;
 398
 399     wxDECLARE_NO_COPY_CLASS(wxConsoleStderr);
 400 };
 401
 402 bool wxConsoleStderr::DoInit()
 403 {
 404     HANDLE hStderr = ::GetStdHandle(STD_ERROR_HANDLE);
 405
 406     if ( hStderr == INVALID_HANDLE_VALUE || !hStderr )
 407         return false;
 408
 409     if ( !m_dllKernel32.Load(_T("kernel32.dll")) )
 410         return false;
 411
 412     typedef BOOL (WINAPI *AttachConsole_t)(DWORD dwProcessId);
 413     AttachConsole_t wxDL_INIT_FUNC(pfn, AttachConsole, m_dllKernel32);
 414
 415     if ( !pfnAttachConsole || !pfnAttachConsole(ATTACH_PARENT_PROCESS) )
 416         return false;
 417
 418     // console attached, set m_hStderr now to ensure that we free it in the
 419     // dtor
 420     m_hStderr = hStderr;
 421
 422     wxDL_INIT_FUNC_AW(m_pfn, GetConsoleCommandHistory, m_dllKernel32);
 423     if ( !m_pfnGetConsoleCommandHistory )
 424         return false;
 425
 426     wxDL_INIT_FUNC_AW(m_pfn, GetConsoleCommandHistoryLength, m_dllKernel32);
 427     if ( !m_pfnGetConsoleCommandHistoryLength )
 428         return false;
 429
 430     // remember the current command history to be able to compare with it later
 431     // in IsHistoryUnchanged()
 432     m_historyLen = GetCommandHistory(m_history);
 433     if ( !m_history )
 434         return false;
 435
 436
 437     // now find the first blank line above the current position
 438     CONSOLE_SCREEN_BUFFER_INFO csbi;
 439
 440     if ( !::GetConsoleScreenBufferInfo(m_hStderr, &csbi) )
 441     {
 442         wxLogLastError(_T("GetConsoleScreenBufferInfo"));
 443         return false;
 444     }
 445
 446     COORD pos;
 447     pos.X = 0;
 448     pos.Y = csbi.dwCursorPosition.Y + 1;
 449
 450     // we decide that a line is empty if first 4 characters are spaces
 451     DWORD ret;
 452     char buf[4];
 453     do
 454     {
 455         pos.Y--;
 456         if ( !::ReadConsoleOutputCharacterA(m_hStderr, buf, WXSIZEOF(buf),
 457                                             pos, &ret) )
 458         {
 459             wxLogLastError(_T("ReadConsoleOutputCharacterA"));
 460             return false;
 461         }
 462     } while ( wxStrncmp("    ", buf, WXSIZEOF(buf)) != 0 );
 463
 464     // calculate line offset and length of data
 465     m_dataLine = csbi.dwCursorPosition.Y - pos.Y;
 466     m_dataLen = m_dataLine*csbi.dwMaximumWindowSize.X + csbi.dwCursorPosition.X;
 467
 468     if ( m_dataLen > 0 )
 469     {
 470         m_data.extend(m_dataLen);
 471         if ( !::ReadConsoleOutputCharacterA(m_hStderr, m_data.data(), m_dataLen,
 472                                             pos, &ret) )
 473         {
 474             wxLogLastError(_T("ReadConsoleOutputCharacterA"));
 475             return false;
 476         }
 477     }
 478
 479     return true;
 480 }
 481
 482 int wxConsoleStderr::GetCommandHistory(wxWxCharBuffer& buf) const
 483 {
 484     // these functions are internal and may only be called by cmd.exe
 485     static const wxChar *CMD_EXE = _T("cmd.exe");
 486
 487     const int len = m_pfnGetConsoleCommandHistoryLength(CMD_EXE);
 488     if ( len )
 489     {
 490         buf.extend(len);
 491
 492         int len2 = m_pfnGetConsoleCommandHistory(buf.data(), len, CMD_EXE);
 493
 494 #if !wxUSE_UNICODE
 495         // there seems to be a bug in the GetConsoleCommandHistoryA(), it
 496         // returns the length of Unicode string and not ANSI one
 497         len2 /= 2;
 498 #endif // !wxUSE_UNICODE
 499
 500         if ( len2 != len )
 501         {
 502             wxFAIL_MSG( _T("failed getting history?") );
 503         }
 504     }
 505
 506     return len;
 507 }
 508
 509 bool wxConsoleStderr::IsHistoryUnchanged() const
 510 {
 511     wxASSERT_MSG( m_ok == 1, _T("shouldn't be called if not initialized") );
 512
 513     // get (possibly changed) command history
 514     wxWxCharBuffer history;
 515     const int historyLen = GetCommandHistory(history);
 516
 517     // and compare it with the original one
 518     return historyLen == m_historyLen && history &&
 519                 memcmp(m_history, history, historyLen) == 0;
 520 }
 521
 522 bool wxConsoleStderr::Write(const wxString& text)
 523 {
 524     wxASSERT_MSG( m_hStderr != INVALID_HANDLE_VALUE,
 525                     _T("should only be called if Init() returned true") );
 526
 527     // get current position
 528     CONSOLE_SCREEN_BUFFER_INFO csbi;
 529     if ( !::GetConsoleScreenBufferInfo(m_hStderr, &csbi) )
 530     {
 531         wxLogLastError(_T("GetConsoleScreenBufferInfo"));
 532         return false;
 533     }
 534
 535     // and calculate new position (where is empty line)
 536     csbi.dwCursorPosition.X = 0;
 537     csbi.dwCursorPosition.Y -= m_dataLine;
 538
 539     if ( !::SetConsoleCursorPosition(m_hStderr, csbi.dwCursorPosition) )
 540     {
 541         wxLogLastError(_T("SetConsoleCursorPosition"));
 542         return false;
 543     }
 544
 545     DWORD ret;
 546     if ( !::FillConsoleOutputCharacter(m_hStderr, _T(' '), m_dataLen,
 547                                        csbi.dwCursorPosition, &ret) )
 548     {
 549         wxLogLastError(_T("FillConsoleOutputCharacter"));
 550         return false;
 551     }
 552
 553     if ( !::WriteConsole(m_hStderr, text.wx_str(), text.length(), &ret, NULL) )
 554     {
 555         wxLogLastError(_T("WriteConsole"));
 556         return false;
 557     }
 558
 559     WriteConsoleA(m_hStderr, m_data, m_dataLen, &ret, 0);
 560
 561     return true;
 562 }
 563
 564 wxConsoleStderr s_consoleStderr;
 565
 566 } // anonymous namespace
 567
 568 bool wxGUIAppTraits::CanUseStderr()
 569 {
 570     return s_consoleStderr.IsOkToUse();
 571 }
 572
 573 bool wxGUIAppTraits::WriteToStderr(const wxString& text)
 574 {
 575     return s_consoleStderr.IsOkToUse() && s_consoleStderr.Write(text);
 576 }
 577
 578 #endif // !__WXWINCE__
 579
 580 // ===========================================================================
 581 // wxApp implementation
 582 // ===========================================================================
 583
 584 int wxApp::m_nCmdShow = SW_SHOWNORMAL;
 585
 586 // ---------------------------------------------------------------------------
 587 // wxWin macros
 588 // ---------------------------------------------------------------------------
 589
 590 IMPLEMENT_DYNAMIC_CLASS(wxApp, wxEvtHandler)
 591
 592 BEGIN_EVENT_TABLE(wxApp, wxEvtHandler)
 593     EVT_IDLE(wxApp::OnIdle)
 594     EVT_END_SESSION(wxApp::OnEndSession)
 595     EVT_QUERY_END_SESSION(wxApp::OnQueryEndSession)
 596 END_EVENT_TABLE()
 597
 598 // class to ensure that wxAppBase::CleanUp() is called if our Initialize()
 599 // fails
 600 class wxCallBaseCleanup
 601 {
 602 public:
 603     wxCallBaseCleanup(wxApp *app) : m_app(app) { }
 604     ~wxCallBaseCleanup() { if ( m_app ) m_app->wxAppBase::CleanUp(); }
 605
 606     void Dismiss() { m_app = NULL; }
 607
 608 private:
 609     wxApp *m_app;
 610 };
 611
 612 //// Initialize
 613 bool wxApp::Initialize(int& argc, wxChar **argv)
 614 {
 615     if ( !wxAppBase::Initialize(argc, argv) )
 616         return false;
 617
 618     // ensure that base cleanup is done if we return too early
 619     wxCallBaseCleanup callBaseCleanup(this);
 620
 621 #if !defined(__WXMICROWIN__)
 622     InitCommonControls();
 623 #endif // !defined(__WXMICROWIN__)
 624
 625 #if defined(__SMARTPHONE__) || defined(__POCKETPC__)
 626     SHInitExtraControls();
 627 #endif
 628
 629 #ifndef __WXWINCE__
 630     // Don't show a message box if a function such as SHGetFileInfo
 631     // fails to find a device.
 632     SetErrorMode(SEM_FAILCRITICALERRORS|SEM_NOOPENFILEERRORBOX);
 633 #endif
 634
 635     wxOleInitialize();
 636
 637 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
 638     wxSetKeyboardHook(true);
 639 #endif
 640
 641     callBaseCleanup.Dismiss();
 642
 643     return true;
 644 }
 645
 646 // ---------------------------------------------------------------------------
 647 // Win32 window class registration
 648 // ---------------------------------------------------------------------------
 649
 650 /* static */
 651 const wxChar *wxApp::GetRegisteredClassName(const wxChar *name,
 652                                             int bgBrushCol,
 653                                             int extraStyles)
 654 {
 655     const size_t count = gs_regClassesInfo.size();
 656     for ( size_t n = 0; n < count; n++ )
 657     {
 658         if ( gs_regClassesInfo[n].basename == name )
 659             return gs_regClassesInfo[n].regname.c_str();
 660     }
 661
 662     // we need to register this class
 663     WNDCLASS wndclass;
 664     wxZeroMemory(wndclass);
 665
 666     wndclass.lpfnWndProc   = (WNDPROC)wxWndProc;
 667     wndclass.hInstance     = wxhInstance;
 668     wndclass.hCursor       = ::LoadCursor(NULL, IDC_ARROW);
 669     wndclass.hbrBackground = (HBRUSH)wxUIntToPtr(bgBrushCol + 1);
 670     wndclass.style         = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS | extraStyles;
 671
 672
 673     ClassRegInfo regClass;
 674     regClass.basename = name;
 675
 676     // constuct a unique suffix to allow registering the class with the same
 677     // base name in a main application using wxWidgets and a DLL using
 678     // wxWidgets loaded into its address space: as gs_regClassesInfo variable
 679     // is different in them, we're going to obtain a unique prefix by using its
 680     // address here
 681     regClass.regname = regClass.basename +
 682                             wxString::Format(wxT("@%p"), &gs_regClassesInfo);
 683     wndclass.lpszClassName = regClass.regname.wx_str();
 684     if ( !::RegisterClass(&wndclass) )
 685     {
 686         wxLogLastError(wxString::Format(wxT("RegisterClass(%s)"),
 687                        regClass.regname));
 688         return NULL;
 689     }
 690
 691     // NB: remember that code elsewhere supposes that no redraw class names
 692     //     use the same names as normal classes with "NR" suffix so we must put
 693     //     "NR" at the end instead of using more natural basename+"NR"+suffix
 694     regClass.regnameNR = regClass.regname + GetNoRedrawClassSuffix();
 695     wndclass.style &= ~(CS_HREDRAW | CS_VREDRAW);
 696     wndclass.lpszClassName = regClass.regnameNR.wx_str();
 697     if ( !::RegisterClass(&wndclass) )
 698     {
 699         wxLogLastError(wxString::Format(wxT("RegisterClass(%s)"),
 700                        regClass.regname));
 701         ::UnregisterClass(regClass.regname.c_str(), wxhInstance);
 702         return NULL;
 703     }
 704
 705     gs_regClassesInfo.push_back(regClass);
 706
 707     // take care to return the pointer which will remain valid after the
 708     // function returns (it could be invalidated later if new elements are
 709     // added to the vector and it's reallocated but this shouldn't matter as
 710     // this pointer should be used right now, not stored)
 711     return gs_regClassesInfo.back().regname.wx_str();
 712 }
 713
 714 bool wxApp::IsRegisteredClassName(const wxString& name)
 715 {
 716     const size_t count = gs_regClassesInfo.size();
 717     for ( size_t n = 0; n < count; n++ )
 718     {
 719         if ( gs_regClassesInfo[n].regname == name ||
 720                 gs_regClassesInfo[n].regnameNR == name )
 721             return true;
 722     }
 723
 724     return false;
 725 }
 726
 727 void wxApp::UnregisterWindowClasses()
 728 {
 729     const size_t count = gs_regClassesInfo.size();
 730     for ( size_t n = 0; n < count; n++ )
 731     {
 732         const ClassRegInfo& regClass = gs_regClassesInfo[n];
 733         if ( !::UnregisterClass(regClass.regname.c_str(), wxhInstance) )
 734         {
 735             wxLogLastError(wxString::Format(wxT("UnregisterClass(%s)"),
 736                            regClass.regname));
 737         }
 738
 739         if ( !::UnregisterClass(regClass.regnameNR.c_str(), wxhInstance) )
 740         {
 741             wxLogLastError(wxString::Format(wxT("UnregisterClass(%s)"),
 742                            regClass.regnameNR));
 743         }
 744     }
 745
 746     gs_regClassesInfo.clear();
 747 }
 748
 749 void wxApp::CleanUp()
 750 {
 751     // all objects pending for deletion must be deleted first, otherwise
 752     // UnregisterWindowClasses() call wouldn't succeed (because windows
 753     // using the classes being unregistered still exist), so call the base
 754     // class method first and only then do our clean up
 755     wxAppBase::CleanUp();
 756
 757 #if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
 758     wxSetKeyboardHook(false);
 759 #endif
 760
 761     wxOleUninitialize();
 762
 763     // for an EXE the classes are unregistered when it terminates but DLL may
 764     // be loaded several times (load/unload/load) into the same process in
 765     // which case the registration will fail after the first time if we don't
 766     // unregister the classes now
 767     UnregisterWindowClasses();
 768 }
 769
 770 // ----------------------------------------------------------------------------
 771 // wxApp ctor/dtor
 772 // ----------------------------------------------------------------------------
 773
 774 wxApp::wxApp()
 775 {
 776     m_printMode = wxPRINT_WINDOWS;
 777 }
 778
 779 wxApp::~wxApp()
 780 {
 781 }
 782
 783 // ----------------------------------------------------------------------------
 784 // wxApp idle handling
 785 // ----------------------------------------------------------------------------
 786
 787 void wxApp::OnIdle(wxIdleEvent& WXUNUSED(event))
 788 {
 789 #if wxUSE_DC_CACHEING
 790     // automated DC cache management: clear the cached DCs and bitmap
 791     // if it's likely that the app has finished with them, that is, we
 792     // get an idle event and we're not dragging anything.
 793     if (!::GetKeyState(MK_LBUTTON) && !::GetKeyState(MK_MBUTTON) && !::GetKeyState(MK_RBUTTON))
 794         wxMSWDCImpl::ClearCache();
 795 #endif // wxUSE_DC_CACHEING
 796 }
 797
 798 void wxApp::WakeUpIdle()
 799 {
 800     // Send the top window a dummy message so idle handler processing will
 801     // start up again.  Doing it this way ensures that the idle handler
 802     // wakes up in the right thread (see also wxWakeUpMainThread() which does
 803     // the same for the main app thread only)
 804     wxWindow * const topWindow = wxTheApp->GetTopWindow();
 805     if ( topWindow )
 806     {
 807         HWND hwndTop = GetHwndOf(topWindow);
 808
 809         // Do not post WM_NULL if there's already a pending WM_NULL to avoid
 810         // overflowing the message queue.
 811         //
 812         // Notice that due to a limitation of PeekMessage() API (which handles
 813         // 0,0 range specially), we have to check the range from 0-1 instead.
 814         // This still makes it possible to overflow the queue with WM_NULLs by
 815         // interspersing the calles to WakeUpIdle() with windows creation but
 816         // it should be rather hard to do it accidentally.
 817         MSG msg;
 818         if ( !::PeekMessage(&msg, hwndTop, 0, 1, PM_NOREMOVE) ||
 819               ::PeekMessage(&msg, hwndTop, 1, 1, PM_NOREMOVE) )
 820         {
 821             if ( !::PostMessage(hwndTop, WM_NULL, 0, 0) )
 822             {
 823                 // should never happen
 824                 wxLogLastError(wxT("PostMessage(WM_NULL)"));
 825             }
 826         }
 827     }
 828 }
 829
 830 // ----------------------------------------------------------------------------
 831 // other wxApp event hanlders
 832 // ----------------------------------------------------------------------------
 833
 834 void wxApp::OnEndSession(wxCloseEvent& WXUNUSED(event))
 835 {
 836     // Windows will terminate the process soon after we return from
 837     // WM_ENDSESSION handler or when we delete our last window, so make sure we
 838     // at least execute our cleanup code before
 839
 840     // prevent the window from being destroyed when the corresponding wxTLW is
 841     // destroyed: this will result in a leak of a HWND, of course, but who
 842     // cares when the process is being killed anyhow
 843     if ( !wxTopLevelWindows.empty() )
 844         wxTopLevelWindows[0]->SetHWND(0);
 845
 846     const int rc = OnExit();
 847
 848     wxEntryCleanup();
 849
 850     // calling exit() instead of ExitProcess() or not doing anything at all and
 851     // being killed by Windows has the advantage of executing the dtors of
 852     // global objects
 853     exit(rc);
 854 }
 855
 856 // Default behaviour: close the application with prompts. The
 857 // user can veto the close, and therefore the end session.
 858 void wxApp::OnQueryEndSession(wxCloseEvent& event)
 859 {
 860     if (GetTopWindow())
 861     {
 862         if (!GetTopWindow()->Close(!event.CanVeto()))
 863             event.Veto(true);
 864     }
 865 }
 866
 867 // ----------------------------------------------------------------------------
 868 // system DLL versions
 869 // ----------------------------------------------------------------------------
 870
 871 // these functions have trivial inline implementations for CE
 872 #ifndef __WXWINCE__
 873
 874 #if wxUSE_DYNLIB_CLASS
 875
 876 namespace
 877 {
 878
 879 // helper function: retrieve the DLL version by using DllGetVersion(), returns
 880 // 0 if the DLL doesn't export such function
 881 int CallDllGetVersion(wxDynamicLibrary& dll)
 882 {
 883     // now check if the function is available during run-time
 884     wxDYNLIB_FUNCTION( DLLGETVERSIONPROC, DllGetVersion, dll );
 885     if ( !pfnDllGetVersion )
 886         return 0;
 887
 888     DLLVERSIONINFO dvi;
 889     dvi.cbSize = sizeof(dvi);
 890
 891     HRESULT hr = (*pfnDllGetVersion)(&dvi);
 892     if ( FAILED(hr) )
 893     {
 894         wxLogApiError(_T("DllGetVersion"), hr);
 895
 896         return 0;
 897     }
 898
 899     return 100*dvi.dwMajorVersion + dvi.dwMinorVersion;
 900 }
 901
 902 } // anonymous namespace
 903
 904 /* static */
 905 int wxApp::GetComCtl32Version()
 906 {
 907     // cache the result
 908     //
 909     // NB: this is MT-ok as in the worst case we'd compute s_verComCtl32 twice,
 910     //     but as its value should be the same both times it doesn't matter
 911     static int s_verComCtl32 = -1;
 912
 913     if ( s_verComCtl32 == -1 )
 914     {
 915         // we're prepared to handle the errors
 916         wxLogNull noLog;
 917
 918         // we don't want to load comctl32.dll, it should be already loaded but,
 919         // depending on the OS version and the presence of the manifest, it can
 920         // be either v5 or v6 and instead of trying to guess it just get the
 921         // handle of the already loaded version
 922         wxLoadedDLL dllComCtl32(_T("comctl32.dll"));
 923         if ( !dllComCtl32.IsLoaded() )
 924         {
 925             s_verComCtl32 = 0;
 926             return 0;
 927         }
 928
 929         // try DllGetVersion() for recent DLLs
 930         s_verComCtl32 = CallDllGetVersion(dllComCtl32);
 931
 932         // if DllGetVersion() is unavailable either during compile or
 933         // run-time, try to guess the version otherwise
 934         if ( !s_verComCtl32 )
 935         {
 936             // InitCommonControlsEx is unique to 4.70 and later
 937             void *pfn = dllComCtl32.GetSymbol(_T("InitCommonControlsEx"));
 938             if ( !pfn )
 939             {
 940                 // not found, must be 4.00
 941                 s_verComCtl32 = 400;
 942             }
 943             else // 4.70+
 944             {
 945                 // many symbols appeared in comctl32 4.71, could use any of
 946                 // them except may be DllInstall()
 947                 pfn = dllComCtl32.GetSymbol(_T("InitializeFlatSB"));
 948                 if ( !pfn )
 949                 {
 950                     // not found, must be 4.70
 951                     s_verComCtl32 = 470;
 952                 }
 953                 else
 954                 {
 955                     // found, must be 4.71 or later
 956                     s_verComCtl32 = 471;
 957                 }
 958             }
 959         }
 960     }
 961
 962     return s_verComCtl32;
 963 }
 964
 965 /* static */
 966 int wxApp::GetShell32Version()
 967 {
 968     static int s_verShell32 = -1;
 969     if ( s_verShell32 == -1 )
 970     {
 971         // we're prepared to handle the errors
 972         wxLogNull noLog;
 973
 974         wxDynamicLibrary dllShell32(_T("shell32.dll"), wxDL_VERBATIM);
 975         if ( dllShell32.IsLoaded() )
 976         {
 977             s_verShell32 = CallDllGetVersion(dllShell32);
 978
 979             if ( !s_verShell32 )
 980             {
 981                 // there doesn't seem to be any way to distinguish between 4.00
 982                 // and 4.70 (starting from 4.71 we have DllGetVersion()) so
 983                 // just assume it is 4.0
 984                 s_verShell32 = 400;
 985             }
 986         }
 987         else // failed load the DLL?
 988         {
 989             s_verShell32 = 0;
 990         }
 991     }
 992
 993     return s_verShell32;
 994 }
 995
 996 #else // !wxUSE_DYNLIB_CLASS
 997
 998 /* static */
 999 int wxApp::GetComCtl32Version()
1000 {
1001     return 0;
1002 }
1003
1004 /* static */
1005 int wxApp::GetShell32Version()
1006 {
1007     return 0;
1008 }
1009
1010 #endif // wxUSE_DYNLIB_CLASS/!wxUSE_DYNLIB_CLASS
1011
1012 #endif // !__WXWINCE__
1013
1014 #if wxUSE_EXCEPTIONS
1015
1016 // ----------------------------------------------------------------------------
1017 // exception handling
1018 // ----------------------------------------------------------------------------
1019
1020 bool wxApp::OnExceptionInMainLoop()
1021 {
1022     // ask the user about what to do: use the Win32 API function here as it
1023     // could be dangerous to use any wxWidgets code in this state
1024     switch (
1025             ::MessageBox
1026               (
1027                 NULL,
1028                 _T("An unhandled exception occurred. Press \"Abort\" to \
1029 terminate the program,\r\n\
1030 \"Retry\" to exit the program normally and \"Ignore\" to try to continue."),
1031                 _T("Unhandled exception"),
1032                 MB_ABORTRETRYIGNORE |
1033                 MB_ICONERROR|
1034                 MB_TASKMODAL
1035               )
1036            )
1037     {
1038         case IDABORT:
1039             throw;
1040
1041         default:
1042             wxFAIL_MSG( _T("unexpected MessageBox() return code") );
1043             // fall through
1044
1045         case IDRETRY:
1046             return false;
1047
1048         case IDIGNORE:
1049             return true;
1050     }
1051 }
1052
1053 #endif // wxUSE_EXCEPTIONS