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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