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Help to get back of a sufrace from a context

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Hello. I have a problem. I want to extract pixel data from a DirectX application, like screen capturing. I can get the application''s DC if I call the GetDC(), but to extract pixels from it I need the DirectDraw sufrace from that. There''s a way to it, the GetSurfaceFromDC() function in DirectDraw7 interface. But it doesn''t work. If there anybody have a workable source of any idea please tell me. Thanks, Jonny

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