C# MVC 生成带LOGO的二维码并返回到客户端

使用zxing开源库  

0积分下载地址：http://download.csdn.net/detail/hejisan/9846307

创建二维码并叠加拼合logo的QRCode.cs类：

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1. using System;  
2. using System.Drawing;  
3. using System.Drawing.Drawing2D;  
4. using System.Drawing.Imaging;  
5. using ZXing;  
6. using ZXing.QrCode;  
7. using ZXing.QrCode.Internal;  
8.   
9. namespace HalfBuy.Biz.Utilities  
10. {  
11.     public class QRCodeHelper  
12.     {  
13.         /// <summary>  
14.         /// 将图片按一定的比例压缩  
15.         /// </summary>  
16.         /// <param name="b">资源图片</param>  
17.         /// <param name="destHeight">高度</param>  
18.         /// <param name="destWidth">宽度</param>  
19.         /// <returns></returns>  
20.         public static Bitmap GetThumbnail(Bitmap b, int destHeight, int destWidth)  
21.         {  
22.             System.Drawing.Image imgSource = b;  
23.             System.Drawing.Imaging.ImageFormat thisFormat = imgSource.RawFormat;  
24.             int sW = 0, sH = 0;  
25.             // 按比例缩放      
26.             int sWidth = imgSource.Width;  
27.             int sHeight = imgSource.Height;  
28.             if (sHeight > destHeight || sWidth > destWidth)  
29.             {  
30.                 if ((sWidth * destHeight) > (sHeight * destWidth))  
31.                 {  
32.                     sW = destWidth;  
33.                     sH = (destWidth * sHeight) / sWidth;  
34.                 }  
35.                 else  
36.                 {  
37.                     sH = destHeight;  
38.                     sW = (sWidth * destHeight) / sHeight;  
39.                 }  
40.             }  
41.             else  
42.             {  
43.                 sW = sWidth;  
44.                 sH = sHeight;  
45.             }  
46.             Bitmap outBmp = new Bitmap(destWidth, destHeight);  
47.             Graphics g = Graphics.FromImage(outBmp);  
48.             g.Clear(Color.Transparent);  
49.             // 设置画布的描绘质量      
50.             g.CompositingQuality = CompositingQuality.HighQuality;  
51.             g.SmoothingMode = SmoothingMode.HighQuality;  
52.             g.InterpolationMode = InterpolationMode.HighQualityBicubic;  
53.             g.DrawImage(imgSource, new Rectangle((destWidth - sW) / 2, (destHeight - sH) / 2, sW, sH), 0, 0, imgSource.Width, imgSource.Height, GraphicsUnit.Pixel);  
54.             g.Dispose();  
55.             // 以下代码为保存图片时，设置压缩质量      
56.             EncoderParameters encoderParams = new EncoderParameters();  
57.             long[] quality = new long[1];  
58.             quality[0] = 100;  
59.             EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);  
60.             encoderParams.Param[0] = encoderParam;  
61.             imgSource.Dispose();  
62.             return outBmp;  
63.         }  
64.   
65.         /// <summary>  
66.         /// 生成二维码  
67.         /// </summary>  
68.         /// <param name="content">需要生成二维码的内容</param>  
69.         /// <param name="size">二维码图片长宽大小</param>  
70.         /// <returns></returns>  
71.         public static Bitmap Create(string content, int size)  
72.         {  
73.             try  
74.             {  
75.                 var options = new QrCodeEncodingOptions  
76.                 {  
77.                     DisableECI = true,  
78.                     CharacterSet = "UTF-8",  
79.                     Width = size,  
80.                     Height = size,  
81.                     Margin = 0,  
82.                     ErrorCorrection = ErrorCorrectionLevel.H  
83.                 };  
84.                 var writer = new BarcodeWriter();  
85.                 writer.Format = BarcodeFormat.QR_CODE;  
86.                 writer.Options = options;  
87.                 var bmp = writer.Write(content);  
88.                 return bmp;  
89.             }  
90.             catch (Exception ex)  
91.             {  
92.                 return null;  
93.             }  
94.         }  
95.  
96.         #region 合并用户QR图片和用户头像  
97.   
98.         /// <summary>     
99.         /// 合并用户QR图片和用户头像     
100.         /// </summary>     
101.         /// <param name="qrImg">QR图片（二维码图片）</param>     
102.         /// <param name="headerImg">用户头像</param>     
103.         /// <param name="n">缩放比例</param>     
104.         /// <returns></returns>     
105.         public static Bitmap MergeQrImg(Bitmap qrImg, Bitmap headerImg, double n = 0.23)  
106.         {  
107.             int margin = 10;  
108.             float dpix = qrImg.HorizontalResolution;  
109.             float dpiy = qrImg.VerticalResolution;  
110.             var _newWidth = (10 * qrImg.Width - 46 * margin) * 1.0f / 46;  
111.             var _headerImg = ZoomPic(headerImg, _newWidth / headerImg.Width);  
112.             //处理头像     
113.             int newImgWidth = _headerImg.Width + margin;  
114.             Bitmap headerBgImg = new Bitmap(newImgWidth, newImgWidth);  
115.             headerBgImg.MakeTransparent();  
116.             Graphics g = Graphics.FromImage(headerBgImg);  
117.             g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;  
118.             g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;  
119.             g.Clear(Color.Transparent);  
120.             Pen p = new Pen(new SolidBrush(Color.White));  
121.             Rectangle rect = new Rectangle(0, 0, newImgWidth - 1, newImgWidth - 1);  
122.             using (GraphicsPath path = CreateRoundedRectanglePath(rect, 7))  
123.             {  
124.                 g.DrawPath(p, path);  
125.                 g.FillPath(new SolidBrush(Color.White), path);  
126.             }  
127.             //画头像     
128.             Bitmap img1 = new Bitmap(_headerImg.Width, _headerImg.Width);  
129.             Graphics g1 = Graphics.FromImage(img1);  
130.             g1.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;  
131.             g1.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;  
132.             g1.Clear(Color.Transparent);  
133.             Pen p1 = new Pen(new SolidBrush(Color.Gray));  
134.             Rectangle rect1 = new Rectangle(0, 0, _headerImg.Width - 1, _headerImg.Width - 1);  
135.             using (GraphicsPath path1 = CreateRoundedRectanglePath(rect1, 7))  
136.             {  
137.                 g1.DrawPath(p1, path1);  
138.                 TextureBrush brush = new TextureBrush(_headerImg);  
139.                 g1.FillPath(brush, path1);  
140.             }  
141.             g1.Dispose();  
142.             PointF center = new PointF((newImgWidth - _headerImg.Width) / 2, (newImgWidth - _headerImg.Height) / 2);  
143.             g.DrawImage(img1, center.X, center.Y, _headerImg.Width, _headerImg.Height);  
144.             g.Dispose();  
145.             Bitmap backgroudImg = new Bitmap(qrImg.Width, qrImg.Height);  
146.             backgroudImg.MakeTransparent();  
147.             backgroudImg.SetResolution(dpix, dpiy);  
148.             headerBgImg.SetResolution(dpix, dpiy);  
149.             Graphics g2 = Graphics.FromImage(backgroudImg);  
150.             g2.Clear(Color.Transparent);  
151.             g2.DrawImage(qrImg, 0, 0);  
152.             PointF center2 = new PointF((qrImg.Width - headerBgImg.Width) / 2, (qrImg.Height - headerBgImg.Height) / 2);  
153.             g2.DrawImage(headerBgImg, center2);  
154.             g2.Dispose();  
155.             return backgroudImg;  
156.         }  
157.  
158.         #endregion  
159.  
160.         #region 图形处理  
161.   
162.         /// <summary>     
163.         /// 创建圆角矩形     
164.         /// </summary>     
165.         /// <param name="rect">区域</param>     
166.         /// <param name="cornerRadius">圆角角度</param>     
167.         /// <returns></returns>     
168.         private static GraphicsPath CreateRoundedRectanglePath(Rectangle rect, int cornerRadius)  
169.         {  
170.             //下午重新整理下，圆角矩形     
171.             GraphicsPath roundedRect = new GraphicsPath();  
172.             roundedRect.AddArc(rect.X, rect.Y, cornerRadius * 2, cornerRadius * 2, 180, 90);  
173.             roundedRect.AddLine(rect.X + cornerRadius, rect.Y, rect.Right - cornerRadius * 2, rect.Y);  
174.             roundedRect.AddArc(rect.X + rect.Width - cornerRadius * 2, rect.Y, cornerRadius * 2, cornerRadius * 2, 270, 90);  
175.             roundedRect.AddLine(rect.Right, rect.Y + cornerRadius * 2, rect.Right, rect.Y + rect.Height - cornerRadius * 2);  
176.             roundedRect.AddArc(rect.X + rect.Width - cornerRadius * 2, rect.Y + rect.Height - cornerRadius * 2, cornerRadius * 2, cornerRadius * 2, 0, 90);  
177.             roundedRect.AddLine(rect.Right - cornerRadius * 2, rect.Bottom, rect.X + cornerRadius * 2, rect.Bottom);  
178.             roundedRect.AddArc(rect.X, rect.Bottom - cornerRadius * 2, cornerRadius * 2, cornerRadius * 2, 90, 90);  
179.             roundedRect.AddLine(rect.X, rect.Bottom - cornerRadius * 2, rect.X, rect.Y + cornerRadius * 2);  
180.             roundedRect.CloseFigure();  
181.             return roundedRect;  
182.         }  
183.   
184.         /// <summary>     
185.         /// 图片按比例缩放     
186.         /// </summary>     
187.         private static Image ZoomPic(Image initImage, double n)  
188.         {  
189.             //缩略图宽、高计算     
190.             double newWidth = initImage.Width;  
191.             double newHeight = initImage.Height;  
192.             newWidth = n * initImage.Width;  
193.             newHeight = n * initImage.Height;  
194.             //生成新图     
195.             //新建一个bmp图片     
196.             System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWidth, (int)newHeight);  
197.             //新建一个画板     
198.             System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage);  
199.             //设置质量     
200.             newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;  
201.             newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;  
202.             //置背景色     
203.             newG.Clear(Color.Transparent);  
204.             //画图     
205.             newG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);  
206.             newG.Dispose();  
207.             return newImage;  
208.         }  
209.  
210.         #endregion  
211.     }  
212. }  

MVC  C#控制器方法生成url二维码及从网络请求logo的Action:

[csharp]  view plain  copy

1. public FileResult GetImage()  
2.        {  
3.            string myshareurl = Config.ShareUrl;//+ UserService.myShareParameter();  
4.            string content = myshareurl;  
5.            Bitmap bitmap = QRCodeHelper.Create(content, 400);  
6.            string filename = DateTime.Now.ToFileTime().ToString();  
7.            Uri uri = new Uri(UserService.SessionUser.headimgurl);  
8.            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(uri);  
9.            System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();  
10.            System.IO.Stream resStream = response.GetResponseStream();  
11.            Bitmap sourcebm = new Bitmap(resStream);//初始化Bitmap图片  
12.            Bitmap qrAndHeaderBitmap = QRCodeHelper.MergeQrImg(bitmap, sourcebm);  
13.            System.IO.MemoryStream ms = new System.IO.MemoryStream();  
14.            qrAndHeaderBitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);    
15.            //qrAndHeaderBitmap.Save(saveFileUrl, System.Drawing.Imaging.ImageFormat.Png);  
16.            qrAndHeaderBitmap.Dispose(); //释放资源    
17.            bitmap.Dispose();  
18.            return new FileContentResult(ms.ToArray(), "image/Png");  
19.            //or like below     
20.            //MemoryStream mem = new MemoryStream(image, 0, image.Length);     
21.            //return new FileStreamResult(mem, "image/jpg");  
22.        }  

MVC 视图请求图片：

[html]  view plain  copy

1. <img id="img" src="/User/GetImage" />  

Over!