public void GetCameraParamsCallbackOK(WSCameraParamsResponse response)
        {
            double[] cam_params = new double[4];
            byte[]   byte_array;
            byte_array = Convert.FromBase64String(response.data);
            float[] paramsf = new float[4];

            IntPtr byte_send;

            byte_send = Marshal.AllocHGlobal(20);
            Marshal.Copy(byte_array, 0, byte_send, 20);
            PikkartARCore.DecryptCalibParams(byte_send, paramsf);
            cam_params[0] = paramsf[0];
            cam_params[1] = paramsf[1];
            cam_params[2] = paramsf[2];
            cam_params[3] = paramsf[3];

            _dataProviderListener.GetCameraParamCallback(cam_params, true);
            _getMarkerRequestRunning = false;
        }