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Redirect directdraw7 application into window

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maybe its strange, but I want to send a full screen application which uses DX7 to window. I know I must hook directdraw API. Thats OK, now when hooked SetCooperativeLevel triggers, I change the parameters: SetCooperativeLevelNext (myWindow, DDSCL_NORMAL); myWindow is an own created window. Now error triggers: "Operation requires the application to have exclusive mode but the application does not have exclusive mode."
How to change things to make it work? I know I might have to use Direct3D9

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