Function name: PostMessage

Defined in : User32

Requirements : Windows NT 3.1 or later; Windows 95 or later

Declaration:

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

Parameters:

* 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.

Returns:

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.

Related functions:

Examples:

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