public static extern UInt32 PowerGetActiveScheme(IntPtr UserRootPowerKey, ref IntPtr ActivePolicyGuid);

    Declare Function PowerGetActiveScheme Lib "powrprof.dll" (ByVal UserRootPowerKey As IntPtr, ByRef ActivePolicyGuid As IntPtr) As Integer

        uint res = PowerGetActiveScheme(IntPtr.Zero, ref ptrActiveGuid);

        uint res = PowerGetActiveScheme(IntPtr.Zero, ref ptrActiveGuid);