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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

Operating Systems Supported
Requires Windows NT 3.1 or later; Requires Windows 95 or later

Library
User32

Parameter Information
- 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.

Return Values
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.

Last update: 07 April 2006