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Getting the Unmanaged IDirect3DSurface9 from a managed surface?

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Hello, I need a way to take a managed directx surface and get its unmanaged IDirect3DSurface9 interface as a IntPtr. Does anyone have any suggestions on how to do this? I have tried DXHelp.CopyOjbectDataToPointer(object obj, IntPtr i) This however fails giving a message saying that a value type is needed to be passed. I have read something about using Surface.GetObjectByValue(int32) which returns an IntPtr, using 0xd2b543af as the Id passed in. This too does not work. Any suggestions would be greatly appreciated. Thanks

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