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 + @"\img\logo.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 + @"\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 }
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
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