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PostMessage The PostMessage function places (posts) a message in the message queue associated with the thread that created the specified window and then returns without waiting for the thread to process the message.
VB4-32,5,6
Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long |
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Operating Systems Supported |
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Requires Windows NT 3.1 or later; Requires Windows 95 or later |
- hWnd
Identifies the window whose window procedure is to receive the message. Two values have special meanings:
HWND_BROADCAST
The 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.
NULL
The function behaves like a call to PostThreadMessage with the dwThreadId parameter set to the identifier of the current thread.
- Msg
Specifies the message to be posted.
- wParam
Specifies additional message-specific information.
- lParam
Specifies additional message-specific information. |
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call GetLastError. |
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