ChangeWindowMessageFilter is a function in the Microsoft Windows operating system that changes the way that a window processes certain types of messages. It is typically used to prevent certain types of messages from being sent to a window, or to modify the behavior of the window in response to a message.

For example, a program may use ChangeWindowMessageFilter to block mouse events from being sent to a window, or to modify the way that the window responds to keyboard input.

ChangeWindowMessageFilter is typically called from within the window procedure for a window, and is passed a message identifier and a message parameter.

The function returns a value indicating whether the message should be allowed to be sent to the window or not.

The ChangeWindowMessageFilter function is available on Windows Vista and later versions of the operating system.

It replaces the pageChangeWindowMessageFilter function, which was available on earlier versions of Windows.

C# Signature:

[DllImport("user32.dll", SetLastError=true)]
static extern TODO ChangeWindowMessageFilter（USER32）(TODO);

VB Signature:

Declare Function ChangeWindowMessageFilter（USER32） Lib "user32.dll" (TODO) As TODO

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

Please add some!

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).