C# 二维码 例子源码

【实例截图】

【核心代码】

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ThoughtWorks.QRCode.Codec;//引用命名空间

namespace QRCode
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            int mapsize = Convert.ToInt32(this.size.Text);
            int mapversion = Convert.ToInt32(this.version.Text);
            string link = this.maplink.Text;
            if (myimage.Image == null)
            {
                MessageBox.Show("请先添加图片！");
            }
            else
            {
                Image img = QrCodeBitmap(link, myimage.Image,mapsize, mapversion);
                this.qrimage.Image = img;
            }
        }
        /// <summary>
        /// 生成二维码位图
        /// </summary>
        /// <param name="link">用于生成二维码的链接</param>4
        /// <param name="size">二维码规模大小</param>
        /// <param name="version">二维码版本</param>
        /// <returns></returns>
        private Image QrCodeBitmap(string link,Image myimg, int size, int version)
        {
            const float multiple = 3.5f;     

            QRCodeEncoder qrcodeencoder = new QRCodeEncoder();//生成设置编码实例
            qrcodeencoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//字节编码
            qrcodeencoder.QRCodeScale = size;//二维码规模大小
            qrcodeencoder.QRCodeVersion = version;//二维码版本
            qrcodeencoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//设置错误校验（错误更正）的级别：中等M
            Image img = qrcodeencoder.Encode(link);//生成二维码image图片

            // 下载于www.mycodes.net

            //计算图片大小  
            float w = img.Width / multiple;

            float pw = w / myimg.Width;
            float ph = w / myimg.Height;
            if (pw > ph)
            {
                pw = ph;
            }

            int mw = (int)(pw * myimg.Width);
            int mh = (int)(pw * myimg.Height);

            //计算图片在二维上的x,y坐标  
            int x = (img.Width - mw) / 2;
            int y = (img.Height - mh) / 2;
            Graphics graphics = Graphics.FromImage(img);
            graphics.DrawImage(myimg, x, y, mw, mh);
            graphics.Dispose();  

            return img;
        }
        /// <summary>
        ///加入二维码的图片
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            this.myimage.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
            OpenFileDialog searchimg = new OpenFileDialog();
            searchimg.Filter = "图片文件|*.bmp;*.jpg;*.jpeg;*.gif;*.png";
            if (searchimg.ShowDialog() == DialogResult.OK)
            {
                this.myimage.Image = Image.FromFile(searchimg.FileName);
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (this.qrimage.Image == null)
            {
                MessageBox.Show("没有可用的二维码图片！");
            }
            else
            {
                SaveFileDialog saveqrimg = new SaveFileDialog();
                saveqrimg.Title = "二维码图片保存";
                saveqrimg.Filter = @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";  
                if (saveqrimg.ShowDialog() == DialogResult.OK)
                {
                    this.qrimage.Image.Save(saveqrimg.FileName,System.Drawing.Imaging.ImageFormat.Jpeg);
                }
            }
        }
           
    }
}