?PostMessage消息發出后不等消息函數處理完就執行它的下一語句???
?SendMessage消息發出后阻塞等消息函數處理完執行它的下一語句

The PostMessage function places (posts) a message in the message queue associated with the thread that created the specified window and returns without waiting for the thread to process the message.

To post a message in the message queue associate with a thread, use the PostThreadMessage function.

BOOL PostMessage(HWND hWnd, // handle to destination window UINT Msg, // message WPARAM wParam, // first message parameter LPARAM lParam // second message parameter );

Parameters

hWnd

[in] Handle to the window whose window procedure is to receive the message. The following values have special meanings. ValueMeaning

HWND_BROADCAST	The message is posted to all top-level windows in the system, including disabled or invisible unowned windows, overlapped windows, and pop-up windows. The message is not posted to child windows.
NULL	The function behaves like a call to PostThreadMessage with the dwThreadId parameter set to the identifier of the current thread.

Msg

[in] Specifies the message to be posted.

wParam

[in] Specifies additional message-specific information.

lParam

[in] Specifies additional message-specific information.

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