生成带二维码的图片

 /// <summary>
        /// 生成带二维码的图片
        /// 所在目录下imgs目录 分为 八张切图
        /// 名称:imgTop、imgTopLeft、imgHeadPhoto、imgTopRight、imgIn、imgLeft、imgRight、imgBotton
        /// 格式：jpg
        /// </summary>
        /// <param name="qrcodeUri">二维码名称</param>
        /// <returns>生成的图片地址</returns>
        public string getQrCodeImg(string qrcodeUri,string where,int hasPhoto) 
        {
            //根据 邀请码 获取当前用户 昵称、头像
            BLL.sf_user_info userBll = new BLL.sf_user_info();
            Model.sf_user_info userInfo = userBll.GetModelByKey(qrcodeUri,where);
            System.Drawing.Image imgHeadPhoto = System.Drawing.Image.FromFile(Utils.GetMapPath(@"/allqrcode/imgs/imgHeadPhoto.jpg"));
            int headwidth = imgHeadPhoto.Width;
            int headheight = imgHeadPhoto.Height;
            try
            {
                if (!string.IsNullOrEmpty(userInfo.photoUri) && hasPhoto>0)
                {
                    System.Net.WebRequest request = System.Net.WebRequest.Create(userInfo.photoUri);
                    System.Net.WebResponse response = request.GetResponse();
                    Stream reader = response.GetResponseStream();
                    if (reader != null)
                    {
                        imgHeadPhoto = System.Drawing.Image.FromStream(reader);
                    }
                    reader.Close();
                    reader.Dispose();
                }
            }
            catch (Exception)
            {
                
            }
            
            //根据 二维码资源 参数 获取图片对象
            System.Drawing.Image imgCode = System.Drawing.Image.FromFile(Utils.GetMapPath(@"/allqrcode/code/" + qrcodeUri + ".jpg"));
            //从固定目录读取 图片所需切片
            System.Drawing.Image imgTop = System.Drawing.Image.FromFile(Utils.GetMapPath(@"/allqrcode/imgs/imgTop.jpg"));
            System.Drawing.Image imgTopLeft = System.Drawing.Image.FromFile(Utils.GetMapPath(@"/allqrcode/imgs/imgTopLeft.jpg"));
            System.Drawing.Image imgTopRight = System.Drawing.Image.FromFile(Utils.GetMapPath(@"/allqrcode/imgs/imgTopRight.jpg"));
            System.Drawing.Image imgIn = System.Drawing.Image.FromFile(Utils.GetMapPath(@"/allqrcode/imgs/imgIn.jpg"));
            System.Drawing.Image imgLeft = System.Drawing.Image.FromFile(Utils.GetMapPath(@"/allqrcode/imgs/imgLeft.jpg"));
            System.Drawing.Image imgRight = System.Drawing.Image.FromFile(Utils.GetMapPath(@"/allqrcode/imgs/imgRight.jpg"));
            System.Drawing.Image imgBotton = System.Drawing.Image.FromFile(Utils.GetMapPath(@"/allqrcode/imgs/imgBotton.jpg"));
            //创建 带二维码的图片 大小的 位图
            Bitmap tmpImage = new Bitmap(imgTop.Width, imgTop.Height + imgTopLeft.Height + imgIn.Height + imgLeft.Height + imgBotton.Height);
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(tmpImage);

            //绘制文字水印
            if (hasPhoto>0)
            {
                System.Drawing.Graphics gs = System.Drawing.Graphics.FromImage(imgIn);
                Brush red = new System.Drawing.Drawing2D.LinearGradientBrush(
                    new Rectangle(10, 20, 240, 30), Color.Red, Color.Red, 90);
                gs.DrawString(userInfo.nickName, new Font("华文楷体", 25, FontStyle.Bold), red, new PointF(160, 33));
                gs.Dispose();
            }

            //在同一位图上 绘制 不同的图片内容
            //绘制头部
            g.DrawImage(imgTop, 0, 0, imgTop.Width, imgTop.Height);
            //绘制头像这一行
            g.DrawImage(imgTopLeft,0, imgTop.Height, imgTopLeft.Width, imgTopLeft.Height);
            g.DrawImage(imgHeadPhoto, imgTopLeft.Width, imgTop.Height, headwidth, headheight);
            g.DrawImage(imgTopRight, imgTopLeft.Width + headwidth, imgTop.Height, imgTopRight.Width, imgTopRight.Height+4);
            //绘制中间
            g.DrawImage(imgIn, 0, imgTop.Height + imgTopLeft.Height, imgIn.Width, imgIn.Height);
            //绘制二维码这一行
            g.DrawImage(imgLeft, 0, imgTop.Height + imgTopLeft.Height + imgIn.Height, imgLeft.Width, imgLeft.Height);
            g.DrawImage(imgCode, imgLeft.Width, imgTop.Height + imgTopLeft.Height + imgIn.Height, imgLeft.Height, imgLeft.Height);
            g.DrawImage(imgRight, imgLeft.Width + imgLeft.Height+2, imgTop.Height + imgTopLeft.Height + imgIn.Height, imgRight.Width, imgRight.Height);
            //绘制底部
            g.DrawImage(imgBotton, 0, imgTop.Height + imgTopLeft.Height + imgIn.Height + imgLeft.Height, imgBotton.Width, imgBotton.Height);
            //释放资源 并保存要返回 位图
            imgTop.Dispose();
            imgLeft.Dispose();
            imgRight.Dispose();
            imgTopLeft.Dispose();
            imgTopRight.Dispose();
            imgIn.Dispose();
            imgBotton.Dispose();
            imgCode.Dispose();
            imgHeadPhoto.Dispose();
            string qrCodeImg = "/allqrcode/imgCode/" + qrcodeUri + ".jpg";
            tmpImage.Save(Utils.GetMapPath(@qrCodeImg));
            g.Dispose();
            tmpImage.Dispose();
            return qrCodeImg;
        }