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今天给大家分享一下，如何基于C#来生成并识别条形码或者二维码。
实现二维码生成的库有很多，我们这里采用的是ZXing.Net。
ZXing是一个开放源码的，用Java实现的多种格式的一维二维条码图像处理库，而ZXing.Net是ZXing在.Net平台下的实现。
我们通过Nuget搜索zxing.net即可搜索安装。
安装好ZXing.Net后，我们创建一个BarCodeHelper，对于进行封装，封装了以下几个方法：
方法一：生成条形码
public static Bitmap GenerateBarCode(string text, int width, int height){ BarcodeWriter writer = new BarcodeWriter(); writer.Format = BarcodeFormat.CODE_39; EncodingOptions options = new EncodingOptions() { Width = width, Height = height, Margin = 2, PureBarcode = true }; writer.Options = options; Bitmap map = writer.Write(text); return map;}
方法二：生成二维码
public static Bitmap GenerateQRCode(string text, int width, int height){ BarcodeWriter writer = new BarcodeWriter(); writer.Format = BarcodeFormat.QR_CODE; QrCodeEncodingOptions options = new QrCodeEncodingOptions() { DisableECI = true, CharacterSet = "UTF-8", Width = width, Height = height, Margin = 1 }; writer.Options = options;
Bitmap map = writer.Write(text); return map;}
方法三：生成带Logo二维码：
public static Bitmap GenerateQRCodeWithLogo(string text, int width, int height, Bitmap logo){ MultiFormatWriter writer = new MultiFormatWriter(); Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>(); hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8"); hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, width, height, hint); BarcodeWriter barcodeWriter = new BarcodeWriter(); Bitmap map = barcodeWriter.Write(bm); int[] rectangle = bm.getEnclosingRectangle(); int middleW = Math.Min((int)(rectangle[2] / 3.5), logo.Width); int middleH = Math.Min((int)(rectangle[3] / 3.5), logo.Height); int middleL = (map.Width - middleW) / 2; int middleT = (map.Height - middleH) / 2; Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb); using (Graphics g = Graphics.FromImage(bmpimg)) { g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; g.DrawImage(map, 0, 0, width, height); } Graphics myGraphic = Graphics.FromImage(bmpimg); myGraphic.FillRectangle(Brushes.Transparent, middleL, middleT, middleW, middleH); myGraphic.DrawImage(logo, middleL, middleT, middleW, middleH); return bmpimg;}
方法四：识别条码二维码：
public static string ReadCode(Bitmap bitmap){ BarcodeReader barcodeReader = new BarcodeReader(); barcodeReader.Options.CharacterSet = "UTF-8"; Result result = barcodeReader.Decode(bitmap); return result.Text;}
有了以上方法后，编写一个案例来进行功能测试。
按钮事件代码很简单，就是调用BarCodeHelper中的对应方法即可。
private void btn_BarCode_Click(object sender, EventArgs e){ this.pic_BarCode.Image = BarCodeHelper.GenerateBarCode(this.txt_BarCode.Text, this.pic_BarCode.Width, this.pic_BarCode.Height);}
private void btn_QRCode_Click(object sender, EventArgs e){ if (chk_Logo.Checked) { this.pic_QRCode.Image = BarCodeHelper.GenerateQRCodeWithLogo(this.txt_QRCode.Text,this.pic_QRCode.Width, this.pic_QRCode.Height, new Bitmap(this.pic_Logo.Image)); } else { this.pic_QRCode.Image = BarCodeHelper.GenerateQRCode(this.txt_QRCode.Text, this.pic_QRCode.Width, this.pic_QRCode.Height); }}
private void btn_ReadQRCode_Click(object sender, EventArgs e){ MessageBox.Show(BarCodeHelper.ReadCode(new Bitmap(this.pic_QRCode.Image)));}
private void btn_ReadBarCode_Click(object sender, EventArgs e){ MessageBox.Show(BarCodeHelper.ReadCode(new Bitmap(this.pic_BarCode.Image)));}
最终实现效果如下所示：
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该文章在 2024/12/25 16:13:25 编辑过
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