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PostMessage
Parameters
(1)hWnd 窗口句柄
(2)Msg 修要发送的消息
(3)wParam 和 lParam 需要根据参数(2)
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended
error information, call GetLastError.
详细可以查阅msdn