自学教程：C++ DispatchMessageA函数代码示例

void Test_GetKeyState(){	HWND hwnd;    MSG msg;		hwnd = CreateTestWindow();		hKbdHook = SetWindowsHookEx(WH_KEYBOARD, KeyboardProc, GetModuleHandleA( NULL ), 0);	hKbdLLHook = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, GetModuleHandleA( NULL ), 0);		ok(hKbdHook!=NULL," /n");	ok(hKbdLLHook!=NULL," /n");		keybd_event(VK_LMENU, 0, 0,0);		while (PeekMessage( &msg, 0, 0, 0, PM_REMOVE )) DispatchMessageA( &msg );		keybd_event(VK_LMENU, 0, KEYEVENTF_KEYUP,0);		//fixme this hangs the test    //while (PeekMessage( &msg, 0, 0, 0, PM_REMOVE|PM_NOYIELD )) DispatchMessageA( &msg );		DestroyWindow(hwnd);	    while (PeekMessage( &msg, 0, 0, 0, PM_REMOVE )) DispatchMessageA( &msg );		UnhookWindowsHookEx (hKbdHook);	UnhookWindowsHookEx (hKbdLLHook);	}

static int Win32_GetEvent(SST_DisplayTarget target, SST_WMEvent* eventReturn){	MSG msg;	SST_DisplayTarget_Win32* displayTarget = (SST_DisplayTarget_Win32*)target;	SST_Window_Win32* win;	int found = 0;	/* First, get Win32 messages and dispatch to winproc. We	do this immediately, otherwise the OS thinks we've hung. */	while(PeekMessageA(&msg, NULL, 0, 0, PM_REMOVE))	{		TranslateMessage(&msg);		DispatchMessageA(&msg);		}	/* Check for user events */	if(RemoveFromEQ(&displayTarget->userEventQueue, eventReturn))		return 1;	/* Now check each window's event queue */	win = displayTarget->firstWindow;	while(win)	{		if(RemoveFromEQ(&win->eventQueue, eventReturn))		{			found = 1;			break;		}		win = win->next;	}	return found;}

unsigned WINAPI CreateWndThreadA(	LPVOID pThreadParam) {	HWND hWnd = CreateWindowA( "Azureus Window Hook", NULL, WS_OVERLAPPEDWINDOW,									CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,									NULL, NULL, hInstance, NULL);	if( hWnd == NULL){		printf( "Failed to create window/n" );		return( 0 );	}else{		MSG Msg;		while(GetMessageA(&Msg, hWnd, 0, 0)) {			TranslateMessage(&Msg);			DispatchMessageA(&Msg);		}		return Msg.wParam;	}} 

static HWND CreateTestWindow(){    MSG msg;    WNDCLASSA  wclass;    HANDLE hInstance = GetModuleHandleA( NULL );    HWND hWndTest;    wclass.lpszClassName = "MouseInputTestClass";    wclass.style         = CS_HREDRAW | CS_VREDRAW;    wclass.lpfnWndProc   = WndProc;    wclass.hInstance     = hInstance;    wclass.hIcon         = LoadIconA( 0, IDI_APPLICATION );    wclass.hCursor       = LoadCursorA( NULL, IDC_ARROW );    wclass.hbrBackground = (HBRUSH)( COLOR_WINDOW + 1 );    wclass.lpszMenuName = 0;    wclass.cbClsExtra    = 0;    wclass.cbWndExtra    = 0;    RegisterClassA( &wclass );    /* create the test window that will receive the keystrokes */    hWndTest = CreateWindowA( wclass.lpszClassName, "MouseInputTestTest",                              WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, 100, 100,                              NULL, NULL, hInstance, NULL);    assert( hWndTest );    ShowWindow( hWndTest, SW_SHOWMAXIMIZED);    SetWindowPos( hWndTest, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOSIZE|SWP_NOMOVE );    SetForegroundWindow( hWndTest );    UpdateWindow( hWndTest);    SetFocus(hWndTest);    /* flush pending messages */    while (PeekMessage( &msg, 0, 0, 0, PM_REMOVE )) DispatchMessageA( &msg );    return hWndTest;}

static void test_messages(void){    WNDCLASSA cls;    HWND win;    MSG msg;    HANDLE thread;    DWORD tid;    InitializeCriticalSection(&clipboard_cs);    memset(&cls, 0, sizeof(cls));    cls.lpfnWndProc = clipboard_wnd_proc;    cls.hInstance = GetModuleHandleA(NULL);    cls.lpszClassName = "clipboard_test";    RegisterClassA(&cls);    win = CreateWindowA("clipboard_test", NULL, 0, 0, 0, 0, 0, NULL, 0, NULL, 0);    ok(win != NULL, "CreateWindow failed: %d/n", GetLastError());    thread = CreateThread(NULL, 0, clipboard_thread, (void*)win, 0, &tid);    ok(thread != NULL, "CreateThread failed: %d/n", GetLastError());    while(GetMessageA(&msg, NULL, 0, 0)) {        TranslateMessage(&msg);        DispatchMessageA(&msg);    }    ok(WaitForSingleObject(thread, INFINITE) == WAIT_OBJECT_0, "WaitForSingleObject failed/n");    CloseHandle(thread);    UnregisterClassA("clipboard_test", GetModuleHandleA(NULL));    DeleteCriticalSection(&clipboard_cs);}

int OGLTest::Run(){    bool fFirst = true;    MSG msg;    do    {        BOOL fGotMessage;        if (miRenderStep)        {            fGotMessage = GetMessageA(&msg, 0, 0, 0);        }        else        {            fGotMessage = PeekMessageA(&msg, 0, 0, 0, PM_REMOVE);        }        if (fGotMessage)        {            TranslateMessage(&msg);            DispatchMessageA(&msg);        }        float dt = 0.0f; /* Time in seconds since last render step. @todo Measure. */        BOOL fDoRender = FALSE;        if (miRenderStep)        {            if (msg.message == WM_CHAR)            {                if (msg.wParam == ' ')                {                    fDoRender = TRUE;                    dt = fFirst ? 0.0f : 0.1f; /* 0.1 second increment per step. */                }            }        }        else        {             fDoRender = TRUE;        }        if (fDoRender)        {            if (mpRender)            {                setCurrentGLCtx(mhGLRC);                mpRender->TimeAdvance(dt);                mpRender->DoRender();                setCurrentGLCtx(NULL);                fFirst = false;            }        }    } while (msg.message != WM_QUIT);    return msg.wParam;}

 void message_loop() {     MSG msg;     while (GetMessage(&msg, 0, 0, 0))     {         DispatchMessageA(&msg);         TranslateMessage(&msg);     } }

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