.net中如何利用Gma.QrCodeNet生成二维码

谁践踏了优雅 2022-05-23 23:48 287阅读 0赞

using System;
    using System.Collections.Generic;
    using System.Drawing;
    using System.Linq;
    using System.Web;
    using System.Web.Mvc;
    using Gma.QrCodeNet.Encoding;
    using Gma.QrCodeNet.Encoding.Windows.Render;
    using System.Drawing.Imaging;
    using System.Text;
    
    /**
     * PS：有 Gma.QrCodeNet的可以直接引入
     * 如果没有Gma.QrCodeNet的话，可以在vs的NuGet包管理器里面下载
     **/
    
    namespace WebApplication1.Controllers
    {
        public class HomeController : Controller
        {
            public ActionResult About()
            {
                return View();
            }
    
            public ActionResult Excute()
            {
                string path = CreateQRCode("啦啦啦，啦啦啦，我是卖报的小行家", Server.MapPath("/Icon/lll_small.jpg"), 9);
                //string path = CreateQRCode("啦啦啦，啦啦啦，我是卖报的小行家",9);
                ViewBag.img = path;
                return View();
            }
    
            /// <summary>
            /// 生成二维码
            /// </summary>
            /// <param name="content">内容</param>
            /// <param name="moduleSize">二维码大小</param>
            /// <returns>返回二维码图片路径</returns>
            public string CreateQRCode(string content, int moduleSize = 9)
            {
                /**
                 * ErrorCorrectionLevel 误差校正水平
                 * QuietZoneModules     空白区域
                 **/
    
                var encoder = new QrEncoder(ErrorCorrectionLevel.M);
                QrCode qrCode = encoder.Encode(content);
    
                GraphicsRenderer render = new GraphicsRenderer(new FixedModuleSize(moduleSize, QuietZoneModules.Two), Brushes.Black, Brushes.White);
    
                //MemoryStream memoryStream = new MemoryStream();
                //render.WriteToStream(qrCode.Matrix, ImageFormat.Jpeg, memoryStream);
    
                //生成图片的代码       
                DrawingSize dSize = render.SizeCalculator.GetSize(qrCode.Matrix.Width);
                Bitmap map = new Bitmap(dSize.CodeWidth, dSize.CodeWidth);
                Graphics g = Graphics.FromImage(map);
                render.Draw(g, qrCode.Matrix);
                string fileName = Guid.NewGuid().ToString().Replace("-", "") + "." + ImageFormat.Jpeg;
                string savePath = Server.MapPath(@"/Img/") + fileName;
                map.Save(savePath);
    
                return "/Img/" + fileName;
            }
    
    
            /// <summary>
            /// 生成带logo的二维码
            /// </summary>
            /// <param name="content">内容</param>
            /// <param name="iconPath">logo路径</param>
            /// <param name="moduleSize">二维码大小</param>
            /// <returns>返回二维码图片路径</returns>
            public string CreateQRCode(string content, string logoPath, int moduleSize = 9)
            {
                QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.M);
                QrCode qrCode = qrEncoder.Encode(content);
    
                GraphicsRenderer render = new GraphicsRenderer(new FixedModuleSize(moduleSize, QuietZoneModules.Two), Brushes.Black, Brushes.White);
    
                DrawingSize dSize = render.SizeCalculator.GetSize(qrCode.Matrix.Width);
                Bitmap map = new Bitmap(dSize.CodeWidth, dSize.CodeWidth);
                Graphics g = Graphics.FromImage(map);
                render.Draw(g, qrCode.Matrix);
    
                /**
                 * 添加Logo图片 ,注意控制Logo图片大小和二维码大小的比例
                 *添加的图片过大超过二维码的容错率会导致信息丢失,无法被识别
                 **/
                Image img = Image.FromFile(logoPath);
    
                Point imgPoint = new Point((map.Width - img.Width) / 2, (map.Height - img.Height) / 2);
                g.DrawImage(img, imgPoint.X, imgPoint.Y, img.Width, img.Height);
    
                string fileName = Guid.NewGuid().ToString().Replace("-", "") + "." + ImageFormat.Jpeg;
                string savePath = Server.MapPath(@"/Img/") + fileName;
                map.Save(savePath);
                return "/Img/" + fileName;
            }
        }
    }

未带logo的二维码效果图：

![20180516171903611][]

带logo的二维码效果图：

![20180516171958484][]

[20180516171903611]: /images/20220524/7b64699baf9540929cce53a76c1f69b7.png
[20180516171958484]: /images/20220524/31efedbf1b2b4f36b1fb51b541154a1b.png