User-1208754703 posted
Hi All,
I am using the following code to display a resized image, all is working fine, I am wanting to only resize images who's width or height are over 500px.
I have added in an IF statement to check the size of the image (this can be seen from lines 39 to 49) but it doesnt seem to do anything, I know I have made a coding error somwhere here but I cant work it out.
If you need anymore information then please let me know,
regards,
Scott.
Code Below:
1 <%@ WebHandler Language="C#" Class="Thumbnail" %>
2
3 using System;
4 using System.Drawing;
5 using System.Drawing.Drawing2D;
6 using System.Drawing.Imaging;
7 using System.IO;
8 using System.Text.RegularExpressions;
9 using System.Web;
10
11 public class Thumbnail : IHttpHandler {
12 private Regex _nameValidationExpression = new Regex(@"[^\w/]");
13 private int _thumbnailSize = 500;
14
15
16 public void ProcessRequest(HttpContext context) {
17 string photoName = context.Request.QueryString["p"];
18 string personID = context.Request.QueryString["id"];
19
20 if (_nameValidationExpression.IsMatch(photoName)) {
21 throw new HttpException(404, "Invalid photo name.");
22 }
23 string cachePath = Path.Combine(HttpRuntime.CodegenDir, photoName + ".png");
24 if (File.Exists(cachePath)) {
25 OutputCacheResponse(context, File.GetLastWriteTime(cachePath));
26 context.Response.WriteFile(cachePath);
27 return;
28 }
29 string photoPath = context.Server.MapPath("~/Demo/UserImages/" + personID + "/" + photoName + ".jpg");
30 Bitmap photo;
31 try {
32 photo = new Bitmap(photoPath);
33 }
34 catch (ArgumentException) {
35 throw new HttpException(404, "Photo not found.");
36 }
37 context.Response.ContentType = "image/png";
38 int width, height;
39 if (photo.Width > 500) (photo.Height > 500);
40 {
41 if (photo.Width > photo.Height) {
42 width = _thumbnailSize;
43 height = photo.Height * _thumbnailSize / photo.Width;
44 }
45 else {
46 width = photo.Width * _thumbnailSize / photo.Height;
47 height = _thumbnailSize;
48 }
49 }
50 Bitmap target = new Bitmap(width, height);
51 using (Graphics graphics = Graphics.FromImage(target)) {
52 graphics.CompositingQuality = CompositingQuality.HighSpeed;
53 graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
54 graphics.CompositingMode = CompositingMode.SourceCopy;
55 graphics.DrawImage(photo, 0, 0, width, height);
56 using (MemoryStream memoryStream = new MemoryStream()) {
57 target.Save(memoryStream, ImageFormat.Png);
58 OutputCacheResponse(context, File.GetLastWriteTime(photoPath));
59 using (FileStream diskCacheStream = new FileStream(cachePath, FileMode.CreateNew)) {
60 memoryStream.WriteTo(diskCacheStream);
61 }
62 memoryStream.WriteTo(context.Response.OutputStream);
63 }
64 }
65 }
66
67 private static void OutputCacheResponse(HttpContext context, DateTime lastModified) {
68 HttpCachePolicy cachePolicy = context.Response.Cache;
69 cachePolicy.SetCacheability(HttpCacheability.Public);
70 cachePolicy.VaryByParams["p"] = true;
71 cachePolicy.SetOmitVaryStar(true);
72 cachePolicy.SetExpires(DateTime.Now + TimeSpan.FromDays(365));
73 cachePolicy.SetValidUntilExpires(true);
74 cachePolicy.SetLastModified(lastModified);
75 }
76
77 public bool IsReusable {
78 get {
79 return true;
80 }
81 }
82 }
