C# Signature:

[DllImport("user32.dll", SetLastError=true)]
public static extern bool ChangeWindowMessageFilterEx(IntPtr hWnd, uint msg, ChangeWindowMessageFilterExAction action,ref CHANGEFILTERSTRUCT changeInfo);

VB Signature:

Declare Function ChangeWindowMessageFilterEx Lib "user32.dll" (TODO) As TODO

User-Defined Field Types:

    public enum MessageFilterInfo : uint
    {
        None=0, AlreadyAllowed=1, AlreadyDisAllowed=2, AllowedHigher=3
    };

    public enum ChangeWindowMessageFilterExAction : uint
    {
        Reset = 0, Allow = 1, DisAllow = 2
    };

    [StructLayout(LayoutKind.Sequential)]
    public struct CHANGEFILTERSTRUCT
    {
        public uint size;
        public MessageFilterInfo info;
    }

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Can use this too:

ChangeWindowMessageFilterEx(Handle,_message,ChangeWindowMessageFilterExAction.Allow, IntPtr.Zero);

If you do not care about the filterStatus

Sample Code:

    CHANGEFILTERSTRUCT filterStatus = new CHANGEFILTERSTRUCT();
        filterStatus.size= (uint) Marshal.SizeOf(filterStatus);
        filterStatus.info = 0;
        ChangeWindowMessageFilterEx(Handle,_message,ChangeWindowMessageFilterExAction.Allow, ref filterStatus);

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).