PeekMessage() 与 GetMessage() 区别

function	Parameters	Return Values
PeekMessage	LPMSG lpMsg, pointer to structure for message HWND hWnd handle to window UINT wMsgFilterMin first message UINT wMsgFilterMax last message UINT wRemoveMsg removal flags	BOOL

Remarks 

If a message is available, the return value is nonzero.
If no messages are available, the return value is zero.

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function	Parameters	Return Values
GetMessage	LPMSG lpMsg address of structure with message HWND hWnd handle of window UINT wMsgFilterMin first message UINT wMsgFilterMax last message	BOOL

Remarks 

If the function retrieves a message other than WM_QUIT, the return value is nonzero.
If the function retrieves the WM_QUIT message, the return value is zero. 
If there is an error, the return value is -1. For example, the function fails if hWnd is an invalid window handle or lpMsg is an invalid pointer. To get extended error information, callGetLastError.

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Example

PeekMessage

 while (!bQuit)
    {
        if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
        {
            if (msg.message == WM_QUIT)
            {
                bQuit = TRUE;
            }
            else
            {
                TranslateMessage (&msg);
                DispatchMessage (&msg);
            }
        }

GetMessage

while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }