| BOOL PostMessage(hwnd, uMsg, wParam, lParam) | |||||
| HWND hwnd; | /* handle of the destination window | */ | |||
| UINT uMsg; | /* message to post, */ | ||||
| WPARAM wParam; | /* first message parameter | */ | |||
| LPARAM lParam; | /* second message parameter | */ | |||
The PostMessage function posts (places) a message in a window's message queue and then returns without waiting for the corresponding window to process the message. Messages in a message queue are retrieved by calls to the GetMessage or PeekMessage function.
hwnd
Identifies the window to which the message will be posted. If this parameter is HWND_BROADCAST, the message will be posted to all top-level windows, including disabled or invisible unowned windows.
uMsg
Specifies the message to be posted.
wParam
Specifies 16 bits of additional message-dependent information.
lParam
Specifies 32 bits of additional message-dependent information.
The return value is nonzero if the function is successful. Otherwise, it is zero.
An application should never use the PostMessage function to post a message to a control.
If the message is being posted to another application and the wParam or lParam parameter is used to pass a handle or pointer to a global memory object, the memory should be allocated by the GlobalAlloc function, using the GMEM_SHARE flag.
GetMessage, PeekMessage, PostAppMessage, SendDlgItemMessage, SendMessage