如何从拇指印象设备拇指预览图片框

Question

我正在尝试从Thumb Impression设备预览图片框中的图像。我在按钮点击上成功完成此操作，在按钮点击时显示我的拇指图像。但我的要求是，当我握住我的拇指时，它应该立即显示我的拇指没有按钮点击。以下是我在按钮点击中使用的代码。请任何人指导。

   private void GetMinDataBtn_Click(object sender, EventArgs e)
        {
            SGFingerPrintManager manager = new SGFingerPrintManager();
            int deviceInfo = manager.Init(SGFPMDeviceName.DEV_AUTO);
            deviceInfo = manager.OpenDevice(0);
            try
            {
                this.m_TestMin.Initialize();
                SGFPMDeviceInfoParam pInfo = new SGFPMDeviceInfoParam();
                deviceInfo = manager.GetDeviceInfo(pInfo);
                byte[] buffer = new byte[pInfo.ImageWidth * pInfo.ImageHeight]; //Here sometime it fails to load image through device. And sometimes it continously works without an issue. 
                deviceInfo = manager.GetImageEx(buffer, 0x1388, (int)this.FDxPicBox.Handle, 50);
                if (manager.CreateTemplate(buffer, this.m_TestMin) == 0)
                {
                    this.FdxToFIRBtn.Enabled = true;
                    this.VerifyBtn.Enabled = true;
                    this.StatusBar.Text = "Get Minutiae Data Success";
                    deviceInfo = manager.CloseDevice();
                }
            }
            catch (Exception ex)
            {
                deviceInfo = manager.CloseDevice();
                MessageBox.Show(ex.ToString());
                this.StatusBar.Text = "Thumb data failed to get";
            }

        }