生成二维码功能

   1. 指定某张Logo图片进行生成

         须引用ThoughtWorks.QRCode.dll

   QrcodeWeChart qwc = new QrcodeWeChart();
            // int memberid = 1000000;
            // int order = 1;
            // string tkt = qwc.ticket(memberid, order);
            //  Ticket t = JsonConvert.DeserializeObject<Ticket>(tkt);
            string url = XXXXXXXXXXXXXXXXXXXXXX;//t.url ;   //要生成二维码的url地址
 
            //验证网址
            if (url.Length == 0)
            {
                //Utils.ShowMsg2(this, "请输入网址");
                return;
            }
            //生成二维码
            QRCodeEncoder qrEntity = new QRCodeEncoder();
            qrEntity.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//二维码编码方式
            qrEntity.QRCodeScale = 10;//每个小方格的宽度
            qrEntity.QRCodeVersion = 5;//二维码版本号
            qrEntity.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//纠错码等级
            System.Drawing.Bitmap srcimage;
            //动态调整二维码版本号,上限40，过长返回空白图片，编码后字符最大字节长度2953
            while (true)
            {
                try
                {
                    srcimage = qrEntity.Encode(url, System.Text.Encoding.UTF8);
                    break;
                }
                catch (IndexOutOfRangeException ex)
                {
                    if (qrEntity.QRCodeVersion < 40)
                    {
                        qrEntity.QRCodeVersion++;
                    }
                    else
                    {
                        srcimage = new Bitmap(300, 300);
                        break;
                    }
                }
            }
            System.Drawing.Image img = System.Drawing.Image.FromFile(Server.MapPath("~/images/favicon.jpg"));

            if (img !=null)
            {
                //System.IO.Stream picstream = img1.InputStream;
                //System.Drawing.Image img = System.Drawing.Image.FromStream(picstream);
                if (img.Width > 250 || img.Height > 250)
                {
                    img.Dispose();
                    //(this, "上传Logo图片错误,Logo图片宽度不能超过250px,且高度不能超过250px！");
                    return;
                    img.Dispose();
                }
                //将logo绘制到二维码
                Bitmap bLogo = img as Bitmap; //获取logo图片对象                     
                bLogo = new Bitmap(bLogo, 50, 50); //改变图片的大小这里我们设置为30                    
                int Y = srcimage.Height;
                int X = srcimage.Width;
                Point point = new Point(X / 2 - 15, Y / 2 - 15);//logo图片绘制到二维码上，这里将简单计算一下logo所在的坐标                      
                Graphics g = Graphics.FromImage(srcimage);//创建一个画布                     
                g.DrawImage(bLogo, point);//将logo图片绘制到二维码图片上 

                //imgQR.ImageUrl = srcimage;
            }
            string tempDire = Server.MapPath("~/imges/Qt");
            if (!Directory.Exists(tempDire)) { Directory.CreateDirectory(tempDire); }
            string imgPath = "~/imges/Qt/" + DateTime.Now.ToString("yyyy_MM_dd_hh_ss_mm") + ".bmp";
            srcimage.Save(Server.MapPath(imgPath));

2.  使用FileupLoad上传的型式上传    须引用ThoughtWorks.QRCode.dll

//验证网址
            string url = this.txtURL.Text.Trim();
            if (url.Length == 0)
            {
                Utils.ShowMsg2(this, "请输入网址");
                return;
            }
            //生成二维码
            QRCodeEncoder qrEntity = new QRCodeEncoder();
            qrEntity.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//二维码编码方式
            qrEntity.QRCodeScale = 10;//每个小方格的宽度
            qrEntity.QRCodeVersion = 5;//二维码版本号
            qrEntity.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//纠错码等级
            System.Drawing.Bitmap srcimage;
            //动态调整二维码版本号,上限40，过长返回空白图片，编码后字符最大字节长度2953
            while (true)
            {
                try
                {
                    srcimage = qrEntity.Encode(url, System.Text.Encoding.UTF8);
                    break;
                }
                catch (IndexOutOfRangeException ex)
                {
                    if (qrEntity.QRCodeVersion < 40)
                    {
                        qrEntity.QRCodeVersion++;
                    }
                    else
                    {
                        srcimage = new Bitmap(300, 300);
                        break;
                    }
                }
            }

            //验证logo
            HttpPostedFile logo = fileLogo.PostedFile;
            if (logo.ContentLength > 0)
            {
                if (!Utils.IsImage(logo.InputStream))
                {
                    Utils.ShowMsg2(this, "图片格式错误");
                    return;
                }
                System.IO.Stream picstream = logo.InputStream;
                System.Drawing.Image img = System.Drawing.Image.FromStream(picstream);
                if (img.Width > 250 || img.Height > 250)
                {
                    img.Dispose();
                    Utils.ShowMsg2(this, "上传Logo图片错误,Logo图片宽度不能超过250px,且高度不能超过250px！");
                    return;
                    img.Dispose();
                }
                //将logo绘制到二维码
                Bitmap bLogo = img as Bitmap; //获取logo图片对象                     
                bLogo = new Bitmap(bLogo, 50, 50); //改变图片的大小这里我们设置为30                    
                int Y = srcimage.Height;
                int X = srcimage.Width;
                Point point = new Point(X / 2 - 15, Y / 2 - 15);//logo图片绘制到二维码上，这里将简单计算一下logo所在的坐标                      
                Graphics g = Graphics.FromImage(srcimage);//创建一个画布                     
                g.DrawImage(bLogo, point);//将logo图片绘制到二维码图片上 

                //imgQR.ImageUrl = srcimage;
            }


            string tempDire = Server.MapPath("../Upload/supplier/" + CurrentSupplier.SupplierID + "/QrBitMap/");
            if (!Directory.Exists(tempDire)) { Directory.CreateDirectory(tempDire); }
            string imgPath = "../Upload/supplier/" + CurrentSupplier.SupplierID + "/QrBitMap/" + Guid.NewGuid().ToString() + ".bmp";
            srcimage.Save(Server.MapPath(imgPath));