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C# 利用ZXing.Net来生成条形码和二维码(转)
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C# 利用ZXing.Net来生成条形码和二维码(转)

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:

1068941201802181732488742059395879.png

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:

10689412018021817354523377482072.png

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

1068941201802181753410462038925897.png

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;
         }
     }
 }

csharp


标题:C# 利用ZXing.Net来生成条形码和二维码(转)
作者:小周黎
地址:https://zhouli.info/articles/2020/04/01/1585725351073.html