随手记一次利用开源zxing生成带嵌入logo的二维码图片

之前就在项目里面用过zxing生成二维码，最近另一个项目同样需要用到二维码，故重新在学了学利用zxing生成二维码

接下来先做准备工作了，因为我是用vs2013上开发的，故选择了.net4.5版本的zxing.dll.另外准备了一张准备嵌入的图片，代码如下：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Web;
using ZXing;
using ZXing.QrCode.Internal;
using ZXing.Common;
using ZXing.Datamatrix;
using System.IO;
using ZXing.Rendering;
using ZXing.QrCode;


namespace UsezxingCreateQRcode.Models
{
    public class CreateQrCode
    {
        public static byte[] GetQrCodeByZXing(string msg, string logo)
        {

            //构造二维码写码器
            QRCodeWriter qrwriter = new QRCodeWriter();
            IDictionary<EncodeHintType, object> hints = new Dictionary<EncodeHintType, object>();
            hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
            hints.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 容错级别
            hints.Add(EncodeHintType.MARGIN, 1);//二维码留白边距
            BarcodeWriter bw = new BarcodeWriter();
            BitMatrix bm = qrwriter.encode(msg, BarcodeFormat.QR_CODE, 300, 300, hints);
            Bitmap img = bw.Write(bm);
//获取logo
            Image logoImage = Image.FromFile(logo);
            //计算插入图片的大小和位置,并计算logo占整个二维码图片的比例
//根据实际需求可自定义logo所占比例
            int logoImageW = Math.Min((int)(img.Size.Width / 4), logoImage.Width);
            int logoImageH = Math.Min((int)(img.Size.Height / 4), logoImage.Height);

            int logoImageX = (img.Width - logoImageW) / 2;
            int logoImageY = (img.Height - logoImageH) / 2;

            //将img转换成bmp格式，并创建 Graphics对象
            Bitmap bmpimg = new Bitmap(img.Width, img.Height, System.Drawing.Imaging.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(img, 0, 0);
            }

            //在二维码中插入图片
            System.Drawing.Graphics MyGraphic = System.Drawing.Graphics.FromImage(bmpimg);
            //白底
            MyGraphic.FillRectangle(Brushes.White, logoImageX, logoImageY, logoImageW, logoImageH);
            MyGraphic.DrawImage(logoImage, logoImageX, logoImageY, logoImageW, logoImageH); //嵌入logo
            MemoryStream ms = new MemoryStream();
bmpimg.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);
            byte[] buffur = ms.ToArray();
            ms.Dispose();
            return buffur;
        }
    }
}

使用以上方法，举例如下：

   public ActionResult CreateQrCode()
        {
            string logo = AppDomain.CurrentDomain.BaseDirectory + "Images\cloud.jpg";
            ViewBag.img = "data:image/Jpeg;base64," + Convert.ToBase64String(UsezxingCreateQRcode.Models.CreateQrCode.GetQrCodeByZXing("NO070133333", logo));
            return View();
        }

........时间不早了，上一个效果图吧：