Subclassing and Hooking with Visual Basic

Name

CallNextHookEx

Synopsis

Used in a hook’s filter function to send information on to the next hook in the chain:

Private Declare Function CallNextHookEx Lib "user32"_
		(ByVal hHook As Long, _
		ByVal ncode As Long, _
		ByVal wParam As Long, _
		lParam As Any) As Long

Parameters

hHook

The handle to the hook. The SetWindowHookEx function returns this hook handle.

ncode

A constant identifying the hook code.

wParam

The wParam argument passed in to the hook filter function. The value of this argument depends on the message that it is associated with.

lParam

The lParam argument passed in to the hook filter function. The value of this argument depends on the message that it is associated with.

Return Value

The return value depends on the type of hook that is installed.