winform 調用攝像頭掃碼識別二維碼的實現步驟

因為公司業務需求,需要在Windows系統下調用攝像頭識別二維碼需求,就有瞭這個功能。

我根據網上網友提供的一些資料,自己整合應用到項目中,效果還不錯(就是感覺像素不是太好)

現在將調用攝像頭+識別二維碼這兩個功能單獨出來寫到這裡,供大傢討論和參考。

有什麼不足或者問題大傢可以提出來,共同改進共同進步

創建一個空的winform項目解決方案,我起名叫他:ScanQRCode

將Form1作為主窗體,設置相關屬性:

  StartPosition:CenterScreen (窗體居中)

  添加一個居中標題:

private void LoadTitleCenterData()
 {
      string titleMsg ="二維碼識別主界面";
      Graphics g = this.CreateGraphics();
      Double startingPoint = (this.Width / 2) - (g.MeasureString(titleMsg, this.Font).Width / 2);
      Double widthOfASpace = g.MeasureString(" ", this.Font).Width;
      String tmp = " ";
      Double tmpWidth = 0;

      while ((tmpWidth + widthOfASpace) < startingPoint)
      {
        tmp += " ";
        tmpWidth += widthOfASpace;
      }
      this.Text = tmp + titleMsg;
 }

最大最小化禁用:

public Form1()
{
  this.MinimizeBox = false;
  this.MaximizeBox = false;
  InitializeComponent();
  LoadTitleCenterData();
}

Form1中添加一個TableLayoutPanel,三行三列,比例按照百分比:10%,80%,10%這樣

在TableLayoutPanel的80%中再添加一個TableLayoutPanel,還是行比例:20%,80%這樣(二八定律)

在TableLayoutPanel中添加Panel,在其中手動在添加幾個按鈕和label

最終界面這樣(能看就行):

添加一個二維碼識別界面CameraQR:

使用Nuget添加引用,搜索AForge,將如下程序包引入:

添加一個識別二維碼的窗體,命名名稱為:CameraQR

將VideoSourcePlayer添加到窗體中,Fill顯示:

窗體中定義幾個私有變量:

 private AForge.Video.DirectShow.FilterInfoCollection _videoDevices;//攝像設備
 System.Timers.Timer timer;//定時器
 CameraHelper _cameraHelper = new CameraHelper();//視屏設備操作類

窗體Load事件中獲取拍照設備列表,並將第一個設備作為攝像設備(如有前後兩個或多個攝像頭,自己去改一下代碼,設置成可以選擇的,在CameraHelper中的CreateFilterInfoCollection()中):

private void CameraQR_Load(object sender, EventArgs e)
{
      // 獲取視頻輸入設備
      _videoDevices = _cameraHelper.CreateFilterInfoCollection();//獲取拍照設備列表
      if (_videoDevices.Count == 0)
      {
        MessageBox.Show("無設備");
        this.Dispose();
        this.Close();
        return;
      }
      resultStr = "";//二維碼識別字符串清空
      _cameraHelper.ConnectDevice(videoSourcePlayer1);//連接打開設備
}

組件初始化完成之後,添加一個定時任務,用來階段性識別攝像設備中的圖片資源,我寫的是每200毫秒去識別一次,如果圖片中有二維碼,就識別二維碼;識別成功之後,關閉窗體,將識別結果返回給上一個界面,此處需要一個有識別二維碼程序包

使用Nuget添加引用,搜索ZXing,將如下程序包引入:

 代碼如下(核心代碼基本就這些):

public CameraQR()
{
  this.MinimizeBox = false;
  this.MaximizeBox = false;
  InitializeComponent();
  LoadTitleCenterData();
  CheckForIllegalCrossThreadCalls = false;//多線程中訪問窗體控件資源不會異常
  AddTimer();//定時識別圖片
}

private void AddTimer()
{
 timer = new System.Timers.Timer();
 timer.Enabled = true;
 timer.Interval = 200;
 timer.Start();
 timer.Elapsed += new ElapsedEventHandler(PicToQRCode);
}
private void PicToQRCode(object sender, ElapsedEventArgs e)
{
      if (_cameraHelper.img == null)
        return;
      BinaryBitmap bitmap = null;
      try
      {
        MemoryStream ms = new MemoryStream();
        _cameraHelper.img.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
        byte[] bt = ms.GetBuffer();
        ms.Close();
        LuminanceSource source = new RGBLuminanceSource(bt, _cameraHelper.img.Width, _cameraHelper.img.Height);
        bitmap = new BinaryBitmap(new ZXing.Common.HybridBinarizer(source));
      }
      catch (Exception ex)
      {
        return;
      }

      Result result=null;
      try
      {
        //開始解碼
        result = new MultiFormatReader().decode(bitmap);
      }
      catch (ReaderException ex)
      {
        resultStr = ex.ToString();
      }
      if (result != null)
      {
        resultStr = result.Text;
        this.DialogResult = DialogResult.OK;
        this.Close();
      }}

窗體關閉時,記得釋放定時器 關閉攝像頭(不然異常滿天飛):

private void CameraQR_FormClosing(object sender, FormClosingEventArgs e)
{
   if (timer != null)
   {
     timer.Dispose();
   }
    _cameraHelper.CloseDevice();
 }

CameraHelper類:

public class CameraHelper
{
  public FilterInfoCollection _videoDevices;//本機攝像硬件設備列表
  public VideoSourcePlayer _videoSourcePlayer;//視頻畫佈
  public Bitmap img = null;//全局變量,保存每一次捕獲的圖像
  public System.Drawing.Image CaptureImage(VideoSourcePlayer sourcePlayer = null)
  {

    if (sourcePlayer == null || sourcePlayer.VideoSource == null)
    {
      if (_videoSourcePlayer == null)
        return null;
      else
      {
        sourcePlayer = _videoSourcePlayer;
      }
    }

    try
    {
      if (sourcePlayer.IsRunning)
      {
        System.Drawing.Image bitmap = sourcePlayer.GetCurrentVideoFrame();
        return bitmap;
      }
      return null;

    }
    catch (Exception ex)
    {
      return null;
    }
  }

  public FilterInfoCollection CreateFilterInfoCollection()
  {
    if (_videoDevices != null)
      return _videoDevices;
    _videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
    return _videoDevices;
  }

  public VideoCaptureDevice ConnectDevice(VideoSourcePlayer videoSourcePlayer, FilterInfo filterInfo = null)
  {
    VideoCaptureDevice videoSource = new VideoCaptureDevice();
    if (filterInfo == null)
    {
      videoSource = new VideoCaptureDevice(_videoDevices[_videoDevices.Count - 1].MonikerString);
    }
    else
    {
      videoSource = new VideoCaptureDevice(filterInfo.MonikerString);
    }

    videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
    videoSourcePlayer.VideoSource = videoSource;
    videoSourcePlayer.Start();
    _videoSourcePlayer = videoSourcePlayer;
    return videoSource;
  }

  private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
  {
    img = (Bitmap)eventArgs.Frame.Clone();
  }

  public void CloseDevice(VideoSourcePlayer videoSourcePlayer = null)
  {
    if (videoSourcePlayer == null)
    {
      if (_videoSourcePlayer == null)
        return;
      _videoSourcePlayer.SignalToStop();
    }
    else
    {
      videoSourcePlayer.SignalToStop();
    }
  }
}

我用的測試二維碼是:

最終的別結果為:

代碼:https://github.com/Binzm/ScanQRCode.git

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