PostMessage与SendMessage
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PostMessage消息发出后不等消息函数处理完就执行它的下一语句
SendMessage消息发出后阻塞等消息函数处理完执行它的下一语句
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.
Value Meaning HWND_BROADCASTThe 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.NULLThe 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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