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Getting graphicsbuffers of directX using games

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Hi I need some help by reading and writing into the graphicsbuffers of DirectX using games. A working way is: 1. get windowhandle with FindWindow() 2. GetWindowDC() 3. GetPixel / SetPixel Sure, these ways are slow like hell! And copying it with the DC to a new virtual bitmap cant be very fast too... so how to gain access to read and write to the memory of a directX using game? it would be really great to get an event before DX flips the buffer (that this one wont be changed any more time by the game) if it does so. Then I do not need to write all the time my new graphics over the existing game graphics. Thx for your help! cOOl Games

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