因为公司业务需求,需要在Windows系统下调用摄像头识别二维码需求,就有了这个功能。

我根据网上网友提供的一些资料,自己整合应用到项目中,效果还不错(就是感觉像素不是太好)

现在将调用摄像头+识别二维码这两个功能单独出来写到这里,供大家讨论和参考。

有什么不足或者问题大家可以提出来,共同改进共同进步

 

创建一个空的winform项目解决方案,我起名叫他:ScanQRCode

将Form1作为主窗体,设置相关属性:

  StartPosition:CenterScreen (窗体居中)

  添加一个居中标题:

 1   private void LoadTitleCenterData()
 2  {
 3             string titleMsg ="二维码识别主界面";
 4             Graphics g = this.CreateGraphics();
 5             Double startingPoint = (this.Width / 2) - (g.MeasureString(titleMsg, this.Font).Width / 2);
 6             Double widthOfASpace = g.MeasureString(" ", this.Font).Width;
 7             String tmp = " ";
 8             Double tmpWidth = 0;
 9 
10             while ((tmpWidth + widthOfASpace) < startingPoint)
11             {
12                 tmp += " ";
13                 tmpWidth += widthOfASpace;
14             }
15             this.Text = tmp + titleMsg;
16  }

最大最小化禁用:

 

1  public Form1()
2 {
3    this.MinimizeBox = false; 
4    this.MaximizeBox = false; 
5    InitializeComponent();
6    LoadTitleCenterData();
7 }

 

 

 

Form1中添加一个TableLayoutPanel,三行三列,比例按照百分比:10%,80%,10%这样

在TableLayoutPanel的80%中再添加一个TableLayoutPanel,还是行比例:20%,80%这样(二八定律)

在TableLayoutPanel中添加Panel,在其中手动在添加几个按钮和label

最终界面这样(能看就行)

添加一个二维码识别界面CameraQR:

使用Nuget添加引用,搜索AForge,将如下程序包引入:

 

添加一个识别二维码的窗体,命名名称为:CameraQR

将VideoSourcePlayer添加到窗体中,Fill显示:

窗体中定义几个私有变量:

1 private AForge.Video.DirectShow.FilterInfoCollection _videoDevices;//摄像设备
2 System.Timers.Timer timer;//定时器
3 CameraHelper _cameraHelper = new CameraHelper();//视屏设备操作类

 

窗体Load事件中获取拍照设备列表,并将第一个设备作为摄像设备(如有前后两个或多个摄像头,自己去改一下代码,设置成可以选择的,在CameraHelper中的CreateFilterInfoCollection()中)

 1  private void CameraQR_Load(object sender, EventArgs e)
 2 {
 3             // 获取视频输入设备
 4             _videoDevices = _cameraHelper.CreateFilterInfoCollection();//获取拍照设备列表
 5             if (_videoDevices.Count == 0)
 6             {
 7                 MessageBox.Show("无设备");
 8                 this.Dispose();
 9                 this.Close();
10                 return;
11             }
12             resultStr = "";//二维码识别字符串清空
13             _cameraHelper.ConnectDevice(videoSourcePlayer1);//连接打开设备
14 }

组件初始化完成之后,添加一个定时任务,用来阶段性识别摄像设备中的图片资源,我写的是每200毫秒去识别一次,如果图片中有二维码,就识别二维码;识别成功之后,关闭窗体,将识别结果返回给上一个界面,此处需要一个有识别二维码程序包

使用Nuget添加引用,搜索ZXing,将如下程序包引入:

 

 

 代码如下(核心代码基本就这些)

public CameraQR()
{
   this.MinimizeBox = false;
   this.MaximizeBox = false;
   InitializeComponent();
   LoadTitleCenterData();
   CheckForIllegalCrossThreadCalls = false;//多线程中访问窗体控件资源不会异常
   AddTimer();//定时识别图片
}

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

窗体关闭时,记得释放定时器 关闭摄像头(不然异常满天飞)

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

CameraHelper类:

 1 public class CameraHelper
 2 {
 3     public FilterInfoCollection _videoDevices;//本机摄像硬件设备列表
 4     public VideoSourcePlayer _videoSourcePlayer;//视频画布
 5     public Bitmap img = null;//全局变量,保存每一次捕获的图像
 6     public System.Drawing.Image CaptureImage(VideoSourcePlayer sourcePlayer = null)
 7     {
 8 
 9         if (sourcePlayer == null || sourcePlayer.VideoSource == null)
10         {
11             if (_videoSourcePlayer == null)
12                 return null;
13             else
14             {
15                 sourcePlayer = _videoSourcePlayer;
16             }
17         }
18 
19         try
20         {
21             if (sourcePlayer.IsRunning)
22             {
23                 System.Drawing.Image bitmap = sourcePlayer.GetCurrentVideoFrame();
24                 return bitmap;
25             }
26             return null;
27 
28         }
29         catch (Exception ex)
30         {
31             return null;
32         }
33     }
34 
35     public FilterInfoCollection CreateFilterInfoCollection()
36     {
37         if (_videoDevices != null)
38             return _videoDevices;
39         _videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
40         return _videoDevices;
41     }
42 
43     public VideoCaptureDevice ConnectDevice(VideoSourcePlayer videoSourcePlayer, FilterInfo filterInfo = null)
44     {
45         VideoCaptureDevice videoSource = new VideoCaptureDevice();
46         if (filterInfo == null)
47         {
48             videoSource = new VideoCaptureDevice(_videoDevices[_videoDevices.Count - 1].MonikerString);
49         }
50         else
51         {
52             videoSource = new VideoCaptureDevice(filterInfo.MonikerString);
53         }
54 
55         videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
56         videoSourcePlayer.VideoSource = videoSource;
57         videoSourcePlayer.Start();
58         _videoSourcePlayer = videoSourcePlayer;
59         return videoSource;
60     }
61 
62     private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
63     {
64         img = (Bitmap)eventArgs.Frame.Clone();
65     }
66 
67     public void CloseDevice(VideoSourcePlayer videoSourcePlayer = null)
68     {
69         if (videoSourcePlayer == null)
70         {
71             if (_videoSourcePlayer == null)
72                 return;
73             _videoSourcePlayer.SignalToStop();
74         }
75         else
76         {
77             videoSourcePlayer.SignalToStop();
78         }
79     }
80 }

我用的测试二维码是:

最终的别结果为:

 

 

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

posted on 2021-01-26 15:28  随风去远方  阅读(2470)  评论(28编辑  收藏