static extern int GetMouseMovePointsEx(uint cbSize, [In] ref MOUSEMOVEPOINT

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] // For GetMouseMovePointsEx

    internal static extern int GetMouseMovePointsEx(

    int cpt = GetMouseMovePointsEx((uint)(Marshal.SizeOf(mp_in)), ref mp_in, mp_out, nNumPointsRequired, mode);