app.cpp

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    }

    // "no redraw" MDI child frame
    wndclass.lpszClassName = wxMDIChildFrameClassNameNoRedraw;
    wndclass.style         = styleNoRedraw;

    if ( !RegisterClass(&wndclass) )
    {
        wxLogLastError(wxT("RegisterClass(no redraw MDI child)"));
    }

    return true;
}

// ---------------------------------------------------------------------------
// UnregisterWindowClasses
// ---------------------------------------------------------------------------

bool wxApp::UnregisterWindowClasses()
{
    bool retval = true;

#ifndef __WXMICROWIN__
    // MDI frame window class.
    if ( !::UnregisterClass(wxMDIFrameClassName, wxhInstance) )
    {
        wxLogLastError(wxT("UnregisterClass(MDI parent)"));

        retval = false;
    }

    // "no redraw" MDI frame
    if ( !::UnregisterClass(wxMDIFrameClassNameNoRedraw, wxhInstance) )
    {
        wxLogLastError(wxT("UnregisterClass(no redraw MDI parent frame)"));

        retval = false;
    }

    // MDI child frame window class.
    if ( !::UnregisterClass(wxMDIChildFrameClassName, wxhInstance) )
    {
        wxLogLastError(wxT("UnregisterClass(MDI child)"));

        retval = false;
    }

    // "no redraw" MDI child frame
    if ( !::UnregisterClass(wxMDIChildFrameClassNameNoRedraw, wxhInstance) )
    {
        wxLogLastError(wxT("UnregisterClass(no redraw MDI child)"));

        retval = false;
    }

    // canvas class name
    if ( !::UnregisterClass(wxCanvasClassName, wxhInstance) )
    {
        wxLogLastError(wxT("UnregisterClass(canvas)"));

        retval = false;
    }

    if ( !::UnregisterClass(wxCanvasClassNameNR, wxhInstance) )
    {
        wxLogLastError(wxT("UnregisterClass(no redraw canvas)"));

        retval = false;
    }
#endif // __WXMICROWIN__

    return retval;
}

void wxApp::CleanUp()
{
    // all objects pending for deletion must be deleted first, otherwise we
    // would crash when they use wxWinHandleHash (and UnregisterWindowClasses()
    // call wouldn't succeed as long as any windows still exist), so call the
    // base class method first and only then do our clean up
    wxAppBase::CleanUp();

#if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
    wxSetKeyboardHook(false);
#endif

    wxOleUninitialize();

    // for an EXE the classes are unregistered when it terminates but DLL may
    // be loaded several times (load/unload/load) into the same process in
    // which case the registration will fail after the first time if we don't
    // unregister the classes now
    UnregisterWindowClasses();

    delete wxWinHandleHash;
    wxWinHandleHash = NULL;
    
#ifdef __WXWINCE__
    free( wxCanvasClassName );
    free( wxCanvasClassNameNR );
#endif
}

// ----------------------------------------------------------------------------
// wxApp ctor/dtor
// ----------------------------------------------------------------------------

wxApp::wxApp()
{
    m_printMode = wxPRINT_WINDOWS;
}

wxApp::~wxApp()
{
    // our cmd line arguments are allocated inside wxEntry(HINSTANCE), they
    // don't come from main(), so we have to free them

    while ( argc )
    {
        // m_argv elements were allocated by wxStrdup()
        free(argv[--argc]);
    }

    // but m_argv itself -- using new[]
    wxDELETEA(argv);
}

// ----------------------------------------------------------------------------
// wxApp idle handling
// ----------------------------------------------------------------------------

void wxApp::OnIdle(wxIdleEvent& event)
{
    wxAppBase::OnIdle(event);

#if wxUSE_DC_CACHEING
    // automated DC cache management: clear the cached DCs and bitmap
    // if it's likely that the app has finished with them, that is, we
    // get an idle event and we're not dragging anything.
    if (!::GetKeyState(MK_LBUTTON) && !::GetKeyState(MK_MBUTTON) && !::GetKeyState(MK_RBUTTON))
        wxDC::ClearCache();
#endif // wxUSE_DC_CACHEING
}

void wxApp::WakeUpIdle()
{
    // Send the top window a dummy message so idle handler processing will
    // start up again.  Doing it this way ensures that the idle handler
    // wakes up in the right thread (see also wxWakeUpMainThread() which does
    // the same for the main app thread only)
    wxWindow *topWindow = wxTheApp->GetTopWindow();
    if ( topWindow )
    {
        if ( !::PostMessage(GetHwndOf(topWindow), WM_NULL, 0, 0) )
        {
            // should never happen
            wxLogLastError(wxT("PostMessage(WM_NULL)"));
        }
    }
}

// ----------------------------------------------------------------------------
// other wxApp event hanlders
// ----------------------------------------------------------------------------

void wxApp::OnEndSession(wxCloseEvent& WXUNUSED(event))
{
    if (GetTopWindow())
        GetTopWindow()->Close(true);
}

// Default behaviour: close the application with prompts. The
// user can veto the close, and therefore the end session.
void wxApp::OnQueryEndSession(wxCloseEvent& event)
{
    if (GetTopWindow())
    {
        if (!GetTopWindow()->Close(!event.CanVeto()))
            event.Veto(true);
    }
}

// ----------------------------------------------------------------------------
// miscellaneous
// ----------------------------------------------------------------------------

/* static */
int wxApp::GetComCtl32Version()
{
#if defined(__WXMICROWIN__) || defined(__WXWINCE__)
    return 0;
#else
    // cache the result
    //
    // NB: this is MT-ok as in the worst case we'd compute s_verComCtl32 twice,
    //     but as its value should be the same both times it doesn't matter
    static int s_verComCtl32 = -1;

    if ( s_verComCtl32 == -1 )
    {
        // initally assume no comctl32.dll at all
        s_verComCtl32 = 0;

        // we're prepared to handle the errors
        wxLogNull noLog;

#if wxUSE_DYNLIB_CLASS
        // do we have it?
        wxDynamicLibrary dllComCtl32(_T("comctl32.dll"), wxDL_VERBATIM);

        // if so, then we can check for the version
        if ( dllComCtl32.IsLoaded() )
        {
            // now check if the function is available during run-time
            wxDYNLIB_FUNCTION( DLLGETVERSIONPROC, DllGetVersion, dllComCtl32 );
            if ( pfnDllGetVersion )
            {
                DLLVERSIONINFO dvi;
                dvi.cbSize = sizeof(dvi);

                HRESULT hr = (*pfnDllGetVersion)(&dvi);
                if ( FAILED(hr) )
                {
                    wxLogApiError(_T("DllGetVersion"), hr);
                }
                else
                {
                    // this is incompatible with _WIN32_IE values, but
                    // compatible with the other values returned by
                    // GetComCtl32Version()
                    s_verComCtl32 = 100*dvi.dwMajorVersion +
                                        dvi.dwMinorVersion;
                }
            }

            // if DllGetVersion() is unavailable either during compile or
            // run-time, try to guess the version otherwise
            if ( !s_verComCtl32 )
            {
                // InitCommonControlsEx is unique to 4.70 and later
                void *pfn = dllComCtl32.GetSymbol(_T("InitCommonControlsEx"));
                if ( !pfn )
                {
                    // not found, must be 4.00
                    s_verComCtl32 = 400;
                }
                else // 4.70+
                {
                    // many symbols appeared in comctl32 4.71, could use any of
                    // them except may be DllInstall()
                    pfn = dllComCtl32.GetSymbol(_T("InitializeFlatSB"));
                    if ( !pfn )
                    {
                        // not found, must be 4.70
                        s_verComCtl32 = 470;
                    }
                    else
                    {
                        // found, must be 4.71 or later
                        s_verComCtl32 = 471;
                    }
                }
            }
        }
#endif        
    }

    return s_verComCtl32;
#endif // Microwin/!Microwin
}

// Yield to incoming messages

bool wxApp::Yield(bool onlyIfNeeded)
{
    // MT-FIXME
    static bool s_inYield = false;

#if wxUSE_LOG
    // disable log flushing from here because a call to wxYield() shouldn't
    // normally result in message boxes popping up &c
    wxLog::Suspend();
#endif // wxUSE_LOG

    if ( s_inYield )
    {
        if ( !onlyIfNeeded )
        {
            wxFAIL_MSG( wxT("wxYield called recursively" ) );
        }

        return false;
    }

    s_inYield = true;

    // we don't want to process WM_QUIT from here - it should be processed in
    // the main event loop in order to stop it
    MSG msg;
    while ( PeekMessage(&msg, (HWND)0, 0, 0, PM_NOREMOVE) &&
            msg.message != WM_QUIT )
    {
#if wxUSE_THREADS
        wxMutexGuiLeaveOrEnter();
#endif // wxUSE_THREADS

        if ( !wxTheApp->Dispatch() )
            break;
    }

    // if there are pending events, we must process them.
    ProcessPendingEvents();

#if wxUSE_LOG
    // let the logs be flashed again
    wxLog::Resume();
#endif // wxUSE_LOG

    s_inYield = false;

    return true;
}

#if wxUSE_EXCEPTIONS

// ----------------------------------------------------------------------------
// exception handling
// ----------------------------------------------------------------------------

bool wxApp::OnExceptionInMainLoop()
{
    // ask the user about what to do: use the Win32 API function here as it
    // could be dangerous to use any wxWidgets code in this state
    switch (
            ::MessageBox
              (
                NULL,
                _T("An unhandled exception occurred. Press \"Abort\" to \
terminate the program,\r\n\
\"Retry\" to exit the program normally and \"Ignore\" to try to continue."),
                _T("Unhandled exception"),
                MB_ABORTRETRYIGNORE |
                MB_ICONERROR| 
                MB_TASKMODAL
              )
           )
    {
        case IDABORT:
            throw;

        default:
            wxFAIL_MSG( _T("unexpected MessageBox() return code") );
            // fall through

        case IDRETRY:
            return false;

        case IDIGNORE:
            return true;
    }
}

#endif // wxUSE_EXCEPTIONS

// ----------------------------------------------------------------------------
// deprecated event loop functions
// ----------------------------------------------------------------------------

#if WXWIN_COMPATIBILITY_2_4

#include "wx/evtloop.h"

void wxApp::DoMessage(WXMSG *pMsg)
{
    wxEventLoop *evtLoop = wxEventLoop::GetActive();
    if ( evtLoop )
        evtLoop->ProcessMessage(pMsg);
}

bool wxApp::DoMessage()
{
    wxEventLoop *evtLoop = wxEventLoop::GetActive();
    return evtLoop ? evtLoop->Dispatch() : false;
}

bool wxApp::ProcessMessage(WXMSG* pMsg)
{
    wxEventLoop *evtLoop = wxEventLoop::GetActive();
    return evtLoop && evtLoop->PreProcessMessage(pMsg);
}

#endif // WXWIN_COMPATIBILITY_2_4