/// <summary>
        /// 计时器方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Timer_RecognitionQRCode(object sender, EventArgs e)
        {
            string strQRCode = QRCodeHelper.BarcodeReader(GetWindowBitmap());

            if (string.IsNullOrEmpty(strQRCode))
            {
                //MessageBox.Show("图像未识别");
            }
            else
            {
                timer.Stop();
                RecognitionBtn = "识别二维码";
                MessageBox.Show(strQRCode);
                return;
            }
        }