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Inheritance IDirectDrawSurface

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The program inherit IDirectDrawSurface (Hook write.) Override all interface classes IDirectDrawSurface. But when compile all the same error:
error C2259: 'MyDirectDrawSurface': cannot instantiate abstract class

What should I do?

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Thank you for your interest.
I trying to write FPS counter for DirectDraw game. I want set hook on DirectDrawCreate() and IDirectDraw, IDirectDrawSurface. Furthermore I run my Launcher.exe, and run my DLL hook procedure, then run my DirectDraw game. And the end - my hook procedure from DLL will itercept Flip() and show FPS in game window.

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All is fine. One function was predetermined wrong (wrong parameters).
Thank you.

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