Windows apps
Collapse the table of content
Expand the table of content
Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

HwndSourceHook Delegate

 

Represents the method that handles Win32 window messages. 

Namespace:   System.Windows.Interop
Assembly:  PresentationCore (in PresentationCore.dll)

Public Delegate Function HwndSourceHook (
	hwnd As IntPtr,
	msg As Integer,
	wParam As IntPtr,
	lParam As IntPtr,
	ByRef handled As Boolean
) As IntPtr

Parameters

hwnd
Type: System.IntPtr

The window handle.

msg
Type: System.Int32

The message ID.

wParam
Type: System.IntPtr

The message's wParam value.

lParam
Type: System.IntPtr

The message's lParam value.

handled
Type: System.Boolean

A value that indicates whether the message was handled. Set the value to true if the message was handled; otherwise, false.

Return Value

Type: System.IntPtr

The appropriate return value depends on the particular message. See the message documentation details for the Win32 message being handled.

Use the AddHook method to register this handler to receive messages.

.NET Framework
Available since 3.0
Return to top
Show:
© 2017 Microsoft