基于Aforge摄像头调用简单实例

 ///查找所有摄像头设备 private void loadCameraList()    {    VideoCaptureDevice cameraDevices =     new FilterInfoCollection(FilterCategory.VideoInputDevice);      if (cameraDevices.Count == 0)      {        capture_btn.Enabled = false;        cameraId_cob.Enabled = false;        preview_btn.Enabled = false;        guide_lab.Text = noCameraDevice;        cameraDevices = null;      }else if(cameraDevices.Count == 1)      {        isSingleCamera = true;        preview_btn.Enabled = false;        guide_lab.Visible = false;      }      foreach (FilterInfo cameraDevice in cameraDevices)      {        cameraId_cob.Items.Add(cameraDevice.Name);        cameraId_cob.SelectedIndex = 0;      }    } ///根据选中摄像头打开该摄像头并预览 private VideoCaptureDevice cameraDevice; private void preview()    {      if (null != cameraDevice)      {//在2个或以上摄像头进行切换时执行        preview_player.SignalToStop();        preview_player.WaitForStop();      }      cameraDevice =       new VideoCaptureDevice(cameraDevices[cameraId_cob.SelectedIndex].MonikerString);      cameraDevice.DesiredFrameSize = new Size(320, 240);      cameraDevice.DesiredFrameRate = 1;      preview_player.VideoSource = cameraDevice;      preview_player.Start();    }///记录当前帧保存为图像private void takePhoto()    {      if (cameraDevice == null)        return;      Bitmap bitmap = preview_player.GetCurrentVideoFrame();      string fullPath = Application.StartupPath + "//";      if (!Directory.Exists(fullPath))        Directory.CreateDirectory(fullPath);      string img = fullPath + "Aforge.jpg";      bitmap.Save(img);      guide_lab.Text = img;      guide_lab.Visible = true;    }

private void aforgeForm_FormClosing(object sender, FormClosingEventArgs e)  {    preview_player.SignalToStop();    preview_player.WaitForStop();  }