C#二维码生成

小鱼儿 2021-09-08 20:02 407阅读 0赞

C\#二维码生成，这里使用开源的ThoughtWorks.QRCode.dll库。

**1、下载ThoughtWorks.QRCode.dll库文件，并引用到项目中。**

**2、创建QRCodeHandler.cs二维码处理类**

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Drawing;
    using ThoughtWorks.QRCode.Codec;
    using ThoughtWorks.QRCode.Codec.Data;
    using ThoughtWorks.QRCode.Codec.Util;
    
    namespace MyStudy.Utility
    {
        /// <summary>
        /// 二维码处理类
        /// </summary>
        public class QRCodeHandler
        {
            /// <summary>
            /// 创建二维码
            /// </summary>
            /// <param name="QRString">二维码字符串</param>
            /// <param name="QRCodeEncodeMode">二维码编码(Byte、AlphaNumeric、Numeric)</param>
            /// <param name="QRCodeScale">二维码尺寸(Version为0时，1：26x26，每加1宽和高各加25</param>
            /// <param name="QRCodeVersion">二维码密集度0-40</param>
            /// <param name="QRCodeErrorCorrect">二维码纠错能力(L：7% M：15% Q：25% H：30%)</param>
            /// <param name="filePath">保存路径</param>
            /// <param name="hasLogo">是否有logo(logo尺寸50x50，QRCodeScale>=5，QRCodeErrorCorrect为H级)</param>
            /// <param name="logoFilePath">logo路径</param>
            /// <returns></returns>
            public bool CreateQRCode(string QRString, string QRCodeEncodeMode, short QRCodeScale, int QRCodeVersion, string QRCodeErrorCorrect, string filePath, bool hasLogo, string logoFilePath)
            {
                bool result = true;
    
                QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
    
                switch (QRCodeEncodeMode)
                {
                    case "Byte":
                        qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
                        break;
                    case "AlphaNumeric":
                        qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;
                        break;
                    case "Numeric":
                        qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;
                        break;
                    default:
                        qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
                        break;
                }
    
                qrCodeEncoder.QRCodeScale = QRCodeScale;
                qrCodeEncoder.QRCodeVersion = QRCodeVersion;
    
                switch (QRCodeErrorCorrect)
                {
                    case "L":
                        qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
                        break;
                    case "M":
                        qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
                        break;
                    case "Q":
                        qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;
                        break;
                    case "H":
                        qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;
                        break;
                    default:
                        qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;
                        break;
                }
    
                try
                {
                    Image image = qrCodeEncoder.Encode(QRString, System.Text.Encoding.UTF8);
                    System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
                    image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);
                    fs.Close();
    
                    if (hasLogo)
                    {
                        Image copyImage = System.Drawing.Image.FromFile(logoFilePath);
                        Graphics g = Graphics.FromImage(image);
                        int x = image.Width / 2 - copyImage.Width / 2;
                        int y = image.Height / 2 - copyImage.Height / 2;
                        g.DrawImage(copyImage, new Rectangle(x, y, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
                        g.Dispose();
    
                        image.Save(filePath);
                        copyImage.Dispose();
                    }
                    image.Dispose();
    
                }
                catch (Exception ex)
                {
                    result = false;
                }
                return result;
            }
    
        }
    }

**3、调用方法，生成二维码**

QRCodeHandler qr = new QRCodeHandler();
    string path = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"/QRCode/";    //文件目录
    string qrString = "http://blog.csdn.net/pan_junbiao";                         //二维码字符串
    string logoFilePath = path + "myLogo.jpg";                                    //Logo路径50*50
    string filePath = path + "myCode.jpg";                                        //二维码文件名
    qr.CreateQRCode(qrString, "Byte", 5, 0, "H", filePath, true, logoFilePath);   //生成