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：

ZXing.Net关键类结构图

包括Reader【识别图片中的条形码和二维码】) 和Writer【生成条形码和二维码到图片中】两部分，如下图所示：

涉及知识点：

• BarcodeWriter 用于生成图片格式的条码类，通过Write函数进行输出。继承关系如上图所示。
• BarcodeFormat 枚举类型，条码格式
• QrCodeEncodingOptions 二维码设置选项，继承于EncodingOptions，主要设置宽，高，编码方式等信息。
• MultiFormatWriter 复合格式条码写码器，通过encode方法得到BitMatrix。
• BitMatrix 表示按位表示的二维矩阵数组，元素的值用true和false表示二进制中的1和0。

示例效果图

关键代码

如下所示，包含一维条码，二维条码，和带logo的条码

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ZXing;
using ZXing.Common;
using ZXing.QrCode;
using ZXing.QrCode.Internal;

namespace DemoQrCode
{
/// <summary>
/// 描述：条形码和二维码帮助类
/// 时间：2018-02-18
/// </summary>
public class BarcodeHelper
{
/// <summary>
/// 生成二维码
/// </summary>
/// <param name="text">内容</param>
/// <param name="width">宽度</param>
/// <param name="height">高度</param>
/// <returns></returns>
public static Bitmap Generate1(string text,int width,int height)
{
BarcodeWriter writer = new BarcodeWriter();
writer.Format = BarcodeFormat.QR_CODE;
QrCodeEncodingOptions options = new QrCodeEncodingOptions()
{
DisableECI = true,//设置内容编码
CharacterSet = "UTF-8", //设置二维码的宽度和高度
Width = width,
Height = height,
Margin = 1//设置二维码的边距,单位不是固定像素
};

writer.Options = options;
Bitmap map = writer.Write(text);
return map;
}

/// <summary>
/// 生成一维条形码
/// </summary>
/// <param name="text">内容</param>
/// <param name="width">宽度</param>
/// <param name="height">高度</param>
/// <returns></returns>
public static Bitmap Generate2(string text,int width,int height)
{
BarcodeWriter writer = new BarcodeWriter();
//使用ITF 格式，不能被现在常用的支付宝、微信扫出来
//如果想生成可识别的可以使用 CODE_128 格式
//writer.Format = BarcodeFormat.ITF;
writer.Format = BarcodeFormat.CODE_39;
EncodingOptions options = new EncodingOptions()
{
Width = width,
Height = height,
Margin = 2
};
writer.Options = options;
Bitmap map = writer.Write(text);
return map;
}

/// <summary>
/// 生成带Logo的二维码
/// </summary>
/// <param name="text">内容</param>
/// <param name="width">宽度</param>
/// <param name="height">高度</param>
public static Bitmap Generate3(string text, int width, int height)
{
//Logo 图片
string logoPath = System.AppDomain.CurrentDomain.BaseDirectory + @"imglogo.png";
Bitmap logo = new Bitmap(logoPath);
//构造二维码写码器
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);
//hint.Add(EncodeHintType.MARGIN, 2);//旧版本不起作用，需要手动去除白边

//生成二维码
BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, width+30, height+30, hint);
bm = deleteWhite(bm);
BarcodeWriter barcodeWriter = new BarcodeWriter();
Bitmap map = barcodeWriter.Write(bm);

//获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸）
int[] rectangle = bm.getEnclosingRectangle();

//计算插入图片的大小和位置
int middleW = Math.Min((int)(rectangle[2] / 3), logo.Width);
int middleH = Math.Min((int)(rectangle[3] / 3), 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);
//白底将二维码插入图片
g.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);
g.DrawImage(logo, middleL, middleT, middleW, middleH);
}
return bmpimg;
}

/// <summary>
/// 删除默认对应的空白
/// </summary>
/// <param name="matrix"></param>
/// <returns></returns>
private static BitMatrix deleteWhite(BitMatrix matrix)
{
int[] rec = matrix.getEnclosingRectangle();
int resWidth = rec[2] + 1;
int resHeight = rec[3] + 1;

BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
resMatrix.clear();
for (int i = 0; i < resWidth; i++)
{
for (int j = 0; j < resHeight; j++)
{
if (matrix[i + rec[0], j + rec[1]])
resMatrix[i, j]=true;
}
}
return resMatrix;
}
}
}

  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 + @"imglogo.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 }

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。

 源码下载链接