前言
C# WinFrm程序调用ZXing.NET实现条码、二维码和带有Logo的二维码生成。
ZXing.NET导入
GitHub开源库
ZXing.NET开源库githib下载地址：https://github.com/zxing/zxing
NuGet包管理
选择安装ZXing.NET v0.16.1版本。
前台部署搭建
如下图，创建WinFrm桌面应用程序后，添加如下必要的控件。
封装ZXingLibs类
核心代码如下：
注意条形码暂时只支持数字（Requested contents should only contain digits, but got 'i'）；
只支持偶数个（The lenght of the input should be even）；
码值最大长度为80（Requested contents should be less than 80 digits long, but got 102）。
1 using System; 2 using System.Collections.Generic; 3 using System.Drawing; 4 using System.Drawing.Imaging; 5 using System.Linq; 6 using System.Text; 7 using System.Threading.Tasks; 8 using ZXing; 9 using ZXing.Common; 10 using ZXing.QrCode; 11 using ZXing.QrCode.Internal; 12 13 namespace GetBarCodeQRCode_ZXing 14 { 15 /// <summary> 16 /// 重新封装条码、二维码生成方法和带有图片的二维码生成方法 17 /// </summary> 18 public class ZXingLibs 19 { 20 /// <summary> 21 /// 生成二维码 22 /// </summary> 23 /// <param name="text">内容</param> 24 /// <param name="width">宽度</param> 25 /// <param name="height">高度</param> 26 /// <returns></returns> 27 public static Bitmap GetQRCode(string text, int width, int height) 28 { 29 BarcodeWriter writer = new BarcodeWriter(); 30 writer.Format = BarcodeFormat.QR_CODE; 31 QrCodeEncodingOptions options = new QrCodeEncodingOptions() 32 { 33 DisableECI = true,//设置内容编码 34 CharacterSet = "UTF-8", //设置二维码的宽度和高度 35 Width = width, 36 Height = height, 37 Margin = 1//设置二维码的边距,单位不是固定像素 38 }; 39 40 writer.Options = options; 41 Bitmap map = writer.Write(text); 42 return map; 43 } 44 45 /// <summary> 46 /// 生成一维条形码 47 /// 只支持数字 Requested contents should only contain digits, but got 'i' 48 /// 只支持偶数个 The lenght of the input should be even 49 /// 最大长度80 Requested contents should be less than 80 digits long, but got 102 50 /// </summary> 51 /// <param name="text">内容</param> 52 /// <param name="width">宽度</param> 53 /// <param name="height">高度</param> 54 /// <returns></returns> 55 public static Bitmap GetBarCode(string text, int width, int height) 56 { 57 BarcodeWriter writer = new BarcodeWriter(); 58 //使用ITF 格式，不能被现在常用的支付宝、微信扫出来 59 //如果想生成可识别的可以使用 CODE_128 格式 60 //writer.Format = BarcodeFormat.ITF; 61 writer.Format = BarcodeFormat.CODE_39; 62 EncodingOptions options = new EncodingOptions() 63 { 64 Width = width, 65 Height = height, 66 Margin = 2 67 }; 68 writer.Options = options; 69 Bitmap map = writer.Write(text); 70 return map; 71 } 72 73 /// <summary> 74 /// 生成带Logo的二维码 75 /// </summary> 76 /// <param name="text">内容</param> 77 /// <param name="width">宽度</param> 78 /// <param name="height">高度</param> 79 public static Bitmap GetQRCodeWithLogo(string text, int width, int height) 80 { 81 //Logo 图片 82 string logoPath = System.AppDomain.CurrentDomain.BaseDirectory + @"\img\logo.bmp"; 83 Bitmap logo = new Bitmap(logoPath); 84 //构造二维码写码器 85 MultiFormatWriter writer = new MultiFormatWriter(); 86 Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>(); 87 hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8"); 88 hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); 89 //hint.Add(EncodeHintType.MARGIN, 2);//旧版本不起作用，需要手动去除白边 90 91 //生成二维码 92 BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, width + 80, height+80, hint); 93 bm = deleteWhite(bm); 94 BarcodeWriter barcodeWriter = new BarcodeWriter(); 95 Bitmap map = barcodeWriter.Write(bm); 96 97 //获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸） 98 int[] rectangle = bm.getEnclosingRectangle(); 99 100 //计算插入图片的大小和位置 101 int middleW = Math.Min((int)(rectangle[2] / 3.5), logo.Width); 102 int middleH = Math.Min((int)(rectangle[3] / 3.5), logo.Height); 103 int middleL = (map.Width - middleW) / 2; 104 int middleT = (map.Height - middleH) / 2; 105 106 Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb); 107 using (Graphics g = Graphics.FromImage(bmpimg)) 108 { 109 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; 110 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; 111 g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; 112 g.DrawImage(map, 0, 0, width, height); 113 //白底将二维码插入图片 114 g.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH); 115 g.DrawImage(logo, middleL, middleT, middleW, middleH); 116 } 117 return bmpimg; 118 } 119 120 /// <summary> 121 /// 删除默认对应的空白 122 /// </summary> 123 /// <param name="matrix"></param> 124 /// <returns></returns> 125 private static BitMatrix deleteWhite(BitMatrix matrix) 126 { 127 int[] rec = matrix.getEnclosingRectangle(); 128 int resWidth = rec[2] + 1; 129 int resHeight = rec[3] + 1; 130 131 BitMatrix resMatrix = new BitMatrix(resWidth, resHeight); 132 resMatrix.clear(); 133 for (int i = 0; i < resWidth; i++) 134 { 135 for (int j = 0; j < resHeight; j++) 136 { 137 if (matrix[i + rec[0], j + rec[1]]) 138 resMatrix[i, j] = true; 139 } 140 } 141 return resMatrix; 142 } 143 } 144 }