How to implement DirectShow Library to build a WPF Application

How to implement DirectShow Library to build a WPF Applicatio开发者_运维百科n that can make 1. capture the video from webcam 2. screen capture to a video file

I try to find example code for the absolutely beginner

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This codeplex project (Touchless) should give you a head start. It is pretty easy to look at the code and see how it works.