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消息發出後不等消息函數處理完就執行它的下一語句
SendMessage消息發出後阻塞等消息函數處理完執行它的下一語句
例如：
一個按鈕向發一個消息，然後彈出一個模態對話框。
當你高速點擊該按鈕時，採用postmessage可能會產生多次點擊事件，導致彈出多個模態對話框
而使用sendmessage，一次點擊後必須響應後才能出來下一次點擊，就可以避免以上問題
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