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how to make screenshots

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hi all! Can anyone give plz a hint how i make a picture from a running videostream. I tried something with Directx and that Interop.Dexterlib assembly but recently i get errors with asf files and i dont know why. so maybe is there another way to get pics out of a stream? thanks so much pete

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Play the stream onto a surface (See DX9 samples).
Draw surface to screen (fullscreen quad)
Use GetFrontBuffer() to capture frames. Must be given a fullscreen A8R8G8B8 buffer to write to, which you can then lock, copy data out of, and write to disk.

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