C# 利用ZXing.Net来生成条形码和二维码

本文是利用ZXing.Net在WinForm中生成条形码，二维码的小例子，仅供学习分享使用，如有不足之处，还请指正。

什么是ZXing.Net?

ZXing是一个开放源码的，用Java实现的多种格式的1D/2D条码图像处理库，它包含了联系到其他语言的端口。而ZXing.Net是ZXing的端口之一。

在工程中引用ZXing.Net

在项目中，点击项目名称右键-->管理NuGet程序包，打开NuGet包管理器窗口，进行搜索下载即可，如下图所示：

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 DemoQrCode
14 {
15     /// <summary>
16     /// 描述：条形码和二维码帮助类
17     /// 时间：2018-02-18
18     /// </summary>
19     public class BarcodeHelper
20     {
21        /// <summary>
22        /// 生成二维码
23        /// </summary>
24        /// <param name="text">内容</param>
25        /// <param name="width">宽度</param>
26        /// <param name="height">高度</param>
27        /// <returns></returns>
28         public static Bitmap Generate1(string text,int width,int height)
29         {
30             BarcodeWriter writer = new BarcodeWriter();
31             writer.Format = BarcodeFormat.QR_CODE;
32             QrCodeEncodingOptions options = new QrCodeEncodingOptions()
33             {
34                 DisableECI = true,//设置内容编码
35                 CharacterSet = "UTF-8",  //设置二维码的宽度和高度
36                 Width = width,
37                 Height = height,
38                 Margin = 1//设置二维码的边距,单位不是固定像素
39             };
40
41             writer.Options = options;
42             Bitmap map = writer.Write(text);
43             return map;
44         }
45
46         /// <summary>
47         /// 生成一维条形码
48         /// </summary>
49         /// <param name="text">内容</param>
50         /// <param name="width">宽度</param>
51         /// <param name="height">高度</param>
52         /// <returns></returns>
53         public static Bitmap Generate2(string text,int width,int height)
54         {
55             BarcodeWriter writer = new BarcodeWriter();
56             //使用ITF 格式，不能被现在常用的支付宝、微信扫出来
57             //如果想生成可识别的可以使用 CODE_128 格式
58             //writer.Format = BarcodeFormat.ITF;
59             writer.Format = BarcodeFormat.CODE_39;
60             EncodingOptions options = new EncodingOptions()
61             {
62                 Width = width,
63                 Height = height,
64                 Margin = 2
65             };
66             writer.Options = options;
67             Bitmap map = writer.Write(text);
68             return map;
69         }
70
71         /// <summary>
72         /// 生成带Logo的二维码
73         /// </summary>
74         /// <param name="text">内容</param>
75         /// <param name="width">宽度</param>
76         /// <param name="height">高度</param>
77         public static Bitmap Generate3(string text, int width, int height)
78         {
79             //Logo 图片
80             string logoPath = System.AppDomain.CurrentDomain.BaseDirectory + @"\img\logo.png";
81             Bitmap logo = new Bitmap(logoPath);
82             //构造二维码写码器
83             MultiFormatWriter writer = new MultiFormatWriter();
84             Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>();
85             hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
86             hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
87             //hint.Add(EncodeHintType.MARGIN, 2);//旧版本不起作用，需要手动去除白边
88
89             //生成二维码
90             BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, width+30, height+30, hint);
91             bm = deleteWhite(bm);
92             BarcodeWriter barcodeWriter = new BarcodeWriter();
93             Bitmap map = barcodeWriter.Write(bm);
94
95             //获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸）
96             int[] rectangle = bm.getEnclosingRectangle();
97
98             //计算插入图片的大小和位置
99             int middleW = Math.Min((int)(rectangle[2] / 3), logo.Width);
100             int middleH = Math.Min((int)(rectangle[3] / 3), logo.Height);
101             int middleL = (map.Width - middleW) / 2;
102             int middleT = (map.Height - middleH) / 2;
103
104             Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb);
105             using (Graphics g = Graphics.FromImage(bmpimg))
106             {
107                 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
108                 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
109                 g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
110                 g.DrawImage(map, 0, 0,width,height);
111                 //白底将二维码插入图片
112                 g.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);
113                 g.DrawImage(logo, middleL, middleT, middleW, middleH);
114             }
115             return bmpimg;
116         }
117
118         /// <summary>
119         /// 删除默认对应的空白
120         /// </summary>
121         /// <param name="matrix"></param>
122         /// <returns></returns>
123         private static BitMatrix deleteWhite(BitMatrix matrix)
124         {
125             int[] rec = matrix.getEnclosingRectangle();
126             int resWidth = rec[2] + 1;
127             int resHeight = rec[3] + 1;
128
129             BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
130             resMatrix.clear();
131             for (int i = 0; i < resWidth; i++)
132             {
133                 for (int j = 0; j < resHeight; j++)
134                 {
135                     if (matrix[i + rec[0], j + rec[1]])
136                         resMatrix[i, j]=true;
137                 }
138             }
139             return resMatrix;
140         }
141     }
142 }

View Code
关于生成条形码和二维码的方式有很多，条码的种类也有很多种，每一种都有其对应的应用领域。