PostMessage();//将消息丢在消息队列就不管了
SendMessage();//等待消息处理，同步函数
SendMessageTimeout();//可以广播信息或者单独发信息，有超时时间，可以设置处理类型，通过fuFlags来设置
fuFlags
- SMTO_NORMAL 超时就返回，不管消息是否起作用
- 其他的据以下可得
| Value |
Meaning |
-
SMTO_ABORTIFHUNG
-
0x0002
|
The function returns without waiting for the time-out period to elapse if the receiving thread appears to not respond or "hangs." |
-
SMTO_BLOCK
-
0x0001
|
Prevents the calling thread from processing any other requests until the function returns. |
-
SMTO_NORMAL
-
0x0000
|
The calling thread is not prevented from processing other requests while waiting for the function to return. |
-
SMTO_NOTIMEOUTIFNOTHUNG
-
0x0008
|
The function does not enforce the time-out period as long as the receiving thread is processing messages. |
-
SMTO_ERRORONEXIT
-
0x0020
|
The function should return 0 if the receiving window is destroyed or its owning thread dies while the message is being processed. |
```c
LRESULT SendMessageTimeoutA(
[in] HWND hWnd,
[in] UINT Msg,
[in] WPARAM wParam,
[in] LPARAM lParam,
[in] UINT fuFlags,
[in] UINT uTimeout,
[out, optional] PDWORD_PTR lpdwResult
);
```
