通过vs2019用C#简单了实现二维码的生成与保存的2种方式_c# 生成二维码

1.主要是记录一下，可能以后自己能再次通过自己写的这篇东西温故而知新；

其中参考了几篇其他大神写的实现c#二维码之代码。

首先c#要想实现二维码的相关操作需要ZXing.dll这个文件

具体方式如下

 项目中右键找到管理NuGet程序包（N）

安装成功后；进行如下代码

方式1.通过创建类的方式，将系统提供的ZXing类的数据进行封装

先创建类ZXingLibs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.Drawing.Imaging;
using ZXing;
using ZXing.Common;
using ZXing.QrCode;
using ZXing.QrCode.Internal;
 
 
 
namespace WindowsFormsApp2
{
    class ZXingLibs
    {
        /// 生成二维码
        public static Bitmap GetQRCode(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",
                Width = width,//设置二维码的宽度和高度
                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;
        }
 
        /// 生成一维条形码
        public static Bitmap GetBarCode(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;
        }
 
        /// 生成带Logo的二维码
        public static Bitmap GetQRCodeWithLogo(string text, int width, int height)
        {
            //Logo 图片
            string logoPath = System.AppDomain.CurrentDomain.BaseDirectory + @"zp.bmp";
            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 + 80, height + 80, 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] / 3.5), logo.Width);
            int middleH = Math.Min((int)(rectangle[3] / 3.5), 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;
        }
 
        /// 删除默认对应的空白
        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;
        }
    }
}

再通过调用ZXingLibs类的方式进行生成二维码，如下图所示

        private void Button10_Click(object sender, EventArgs e)
        {
            string qrData = "";
            qrData = "" + textBox1.Text ;
            pictureBox1.Image = ZXingLibs.GetQRCode(qrData, pictureBox1.Width, pictureBox1.Height);
 
 
        }

方式二：直接利用ZXing中自带的类，直接调用；相对来说直接使用时，没有方式1（已二次封装）更加简洁

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using ZXing.Common;
using ZXing;
namespace WindowsFormsApp2
{
    public partial class FrmUseControls : Form
    {
        public FrmUseControls()
        {
            InitializeComponent();
        }
 
        private void Button11_Click(object sender, EventArgs e)
        {
            // 1.设置QR二维码的规格
            ZXing.QrCode.QrCodeEncodingOptions qrEncodeOption = new ZXing.QrCode.QrCodeEncodingOptions();
            qrEncodeOption.CharacterSet = "UTF-8"; // 设置编码格式，否则读取'中文'乱码
            qrEncodeOption.Height = pictureBox1.Height;//设置高度
            qrEncodeOption.Width = pictureBox1.Width; //设置宽度
            qrEncodeOption.Margin = 1;  // 设置周围空白边距
 
            // 2.生成条形码图片并保存
            ZXing.BarcodeWriter Qr = new BarcodeWriter();
            Qr.Format = BarcodeFormat.QR_CODE; // 二维码
            Qr.Options = qrEncodeOption;
            Bitmap img = Qr.Write(textBox1.Text);//"textBox1"就是用来输入数据内容的控件
            pictureBox1.Image = img;
 
 
 
 
 
 
 
 
 
 
 
    }
}