Subclassing and Hooking with Visual Basic

Name

SendMessage

Synopsis

Sends a message to the specified target window:

Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
		(ByVal hwnd As Long, ByVal wMsg As Long, _
		ByVal wParam As Long, lParam As Any) 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

The return value depends on the message sent.