Subclassing and Hooking with Visual Basic

Name

SendNotifyMessage

Synopsis

If this function is used to send a message to a window in the same thread, the calling function halts processing until the SendNotifyMessage function returns, similar to the SendMessage function. If the message is sent to a window in a different thread, the function returns immediately:

Public Declare Function SendNotifyMessage Lib "user32" _
         Alias "SendNotifyMessageA" _
		(ByVal hwnd As Long, ByVal Msg As Long, _
		ByVal wParam As Long, ByVal lParam As Long) As Long

Parameters

hwnd

The handle of the target window, or HWND_BROADCAST if the message is to be sent to all top-level windows in the system

wMsg

The message to send to the target window

wParam

The first parameter of the message

lParam

The second parameter of the message

Return Value

This function returns only an error status (zero on failure, nonzero on success) and no other information.