二维码生成方法
从网上到处找代码东拼西凑出来的一个二维码生成方法,支持给二维码上面贴图标。
需要通过Nuget引用QRCode.Net
先贴个调用的Demo吧,直接从项目中拷过来的,看意思就好。
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public string GetUserQRCode(Web_User user) { var url = VirtualPaths.HostAddress + "/Member/MemberSpaceAddFriend?name=" + user.Name; string userHeadphoto = ""; //如果用户的头像不为空,则给二维码加上用户头像 if (!string.IsNullOrEmpty(user.HeadPhoto)) { userHeadphoto= VirtualPaths.ImgDir+user.HeadPhoto; } var path = VirtualPaths.ImgDir+ "/Upload/QRCode/"; string qrCode = SaveCodeImg(url, userHeadphoto, path); user.QRCode = "/Upload/QRCode/" + qrCode; UpdateUser(user); return user.QRCode; }
#region 二维码生成基础方法 /// <summary> /// 生成用户信息的二维码 /// </summary> /// <param name="url">要生成的字符串</param> /// <param name="headPhoto">要贴到二维码上面的头像</param> /// <param name="filePath">文件的保存路径</param> /// <returns></returns> public string SaveCodeImg(string url, string headPhoto, string filePath) { var fileName = GetFileNameByDate(); var path = Path.Combine(filePath, fileName); QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H); QrCode qrCode = new QrCode(); qrEncoder.TryEncode(url, out qrCode); var renderer = new GraphicsRenderer(new FixedModuleSize(4, QuietZoneModules.Two)); //var image = new Bitmap(); Image img = new Bitmap(200, 200); Image qrcode = new Bitmap(200, 200); using (Graphics g = Graphics.FromImage(img)) { renderer.Draw(g, qrCode.Matrix); g.DrawImage(img, new Point { X = 0, Y = 0 }); //using (MemoryStream stream = new MemoryStream()) //{ // img.Save(stream, ImageFormat.Jpeg); //} if (string.IsNullOrEmpty(headPhoto) || !File.Exists(headPhoto)) { // img.Save(path+".jpg"); qrcode = img; qrcode.Save(path+".jpg"); } else { qrcode = CombinImage(img, headPhoto); qrcode.Save(path + ".jpg"); } } return fileName+".jpg"; } private string GetFileNameByDate() { string productnumber = ""; //按年月日生成前12位 productnumber = DateTime.Now.Year.ToString().Substring(2, 2) + DateTime.Now.Month.ToString().PadLeft(2, '0') + DateTime.Now.Day.ToString().PadLeft(2, '0'); productnumber += DateTime.Now.Hour.ToString().PadLeft(2, '0'); // +DateTime.Now.Minute.ToString().PadLeft(2, '0') + DateTime.Now.Second.ToString().PadLeft(2, '0'); //随即数生成4位 var rnd = new Random((int)DateTime.Now.Ticks); productnumber += rnd.Next(0, 9999).ToString().PadLeft(4, '0'); return productnumber; } public static Image CombinImage(Image imgBack, string destImg) { Image img = Image.FromFile(destImg); //照片图片 if (img.Height != 65 || img.Width != 65) { img = KiResizeImage(img, 65, 65, 0); } Graphics g = Graphics.FromImage(imgBack); g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height); //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高); //g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 - img.Width / 2 - 1, imgBack.Width / 2 - img.Width / 2 - 1,1,1);//相片四周刷一层黑色边框 //g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 照片高); g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2, img.Width, img.Height); GC.Collect(); return imgBack; } public static Image KiResizeImage(Image bmp, int newW, int newH, int Mode) { try { Image b = new Bitmap(newW, newH); Graphics g = Graphics.FromImage(b); // 插值算法的质量 g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel); g.Dispose(); return b; } catch { return null; } } #endregion
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