1.PostMessage
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.
2.SendMessage
The SendMessage
function sends the specified message to a window or
windows. It calls the window procedure for the
specified window and does not return until the window
procedure has processed the message.
To send a
message and return immediately, use the
SendMessageCallback or SendNotifyMessage function. To post
a message to a thread's message queue and return
immediately, use the PostMessage or PostThreadMessage
function.
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
例如：
一个按钮向发一个消息，然后弹出一个模态对话框。
当你高速点击该按钮时，采用postmessage可能会产生多次点击事件，导致弹出多个模态对话框
而使用sendmessage，一次点击后必须响应后才能出来下一次点击，就可以避免以上问题
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