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I'm building an application which needs to filter some mouse clicks system-wide. That is, I need to make the system ignore some mouse button clicks at special occasions. I use low level mouse hook and SetWindowsHookEx to filter out these clicks. It works relatively well, except for WPF applications. I guess that's because these applications use DirectX and DirectInput for input processing, and that's why I can't filter out clicks in these applications, since they get the input directly from the driver. Is there any way how to filter clicks in WPF / DirectX applications? I know it is generally not good idea to globally filter clicks, but it is crucial for my application, and I will make sure that it is not filtered in games and other programs. But WPF applications have ordinary GUI , so I need to filter clicks in them as well. Update I guess I could solve this problem by writing my own filtering driver, but since I don't have any experience in writing drivers, please let me know if there is any other solution. API Hooking Resources I've found some helpful links regarding API hooking. Use this as a reference. Hooking Windows API API hooking revealed API hooking revealed Part 2 Hijack Textout Calls From Notepad madCodeHook <a href="http://sandsprite.com/CodeStuff/IAT_Hooking.html" rel="nofollow norefer

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