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