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HwndSourceHook Delegate

Represents the method that handles Win32 window messages. 

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

public delegate IntPtr HwndSourceHook(
	IntPtr hwnd,
	int msg,
	IntPtr wParam,
	IntPtr lParam,
	ref bool handled


Type: System.IntPtr

The window handle.

Type: System.Int32

The message ID.

Type: System.IntPtr

The message's wParam value.

Type: System.IntPtr

The message's lParam value.

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

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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