bool[] b = {false};
            System.Runtime.InteropServices.GCHandle h = System.Runtime.InteropServices.GCHandle.Alloc(b, System.Runtime.InteropServices.GCHandleType.Pinned);
            IntPtr ptr = h.AddrOfPinnedObject();
            System.Runtime.InteropServices.Marshal.WriteByte(ptr, 255);
            h.Free();
            GetData(null, b[0]);