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Remarks
An application can process WM_TIMER messages by including a WM_TIMER case statement in the window procedure or by specifying a TimerProc callback function when creating the timer. When you specify a TimerProc callback function, the default window procedure calls the callback function when it processes WM_TIMER. Therefore, you need to dispatch messages in the calling thread, even when you use TimerProc instead of processing WM_TIMER. MSDN中对SETTIMER的描述~~~注意粗体字 楼上的大牛不说，我还真不会看REMARKS呢。看来有条件得把MSDN都看一次 
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