offline images

friends list / select friend distance
2026-06-29 09:01:55 +03:00 · 2011-04-05 00:40:21 +03:00
parent f79ee0adc2
commit bf599907dc
23 changed files with 1099 additions and 348 deletions
@@ -0,0 +1,95 @@
+using System;
+using System.Net;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Shapes;
+using System.Collections.Generic;
+using System.Windows.Media.Imaging;
+using System.IO;
+using System.IO.IsolatedStorage;
+using System.Runtime.Serialization;
+
+namespace WPImageCaching
+{
+    internal static class ImageCache
+    {
+        private const string IMAGECACHEFILE = "imagecachefile.nfo";
+        internal static Dictionary<string, ImageCacheItem> imageCache;
+
+
+        public static BitmapImage GetImage(BitmapImage image)
+        {
+            string url = image.UriSource.ToString();
+
+            if (Environment.OSVersion.Platform == PlatformID.Win32NT)
+            {
+                //Wenn im Designmodus von Blend oder Visual Studio
+                image.UriSource = new Uri(url);
+                return image;
+            }
+
+            if (imageCache==null)
+            {
+                LoadCachedImageInfo();
+            }
+            
+            //Prüfen auf ein vorhandenes gespeichertes Bild
+            if (imageCache.ContainsKey(url))
+            {
+                //Prüfen auf Gültigkeit des Bildes
+                if (DateTime.Compare(DateTime.Now, imageCache[url].Expiration) >= 0)
+                {
+                    ImageDownloadHelper.DownloadImage(url,image,imageCache[url]);
+                }
+                else
+                {
+                    //Bild ist noch gültig
+                    image.SetSource(IsolatedStorageFile.GetUserStoreForApplication().OpenFile(imageCache[url].LocalFilename, FileMode.Open));
+                    return image;
+                }
+            }
+            else
+            {
+                //Bild noch nicht gespeichert
+                ImageCacheItem item = new ImageCacheItem();
+                ImageDownloadHelper.DownloadImage(url, image, item);
+            }
+            return image;
+        }
+
+        //Laden der Bildinformationen
+        private static void LoadCachedImageInfo()
+        {
+            if (IsolatedStorageFile.GetUserStoreForApplication().FileExists(IMAGECACHEFILE))
+            {
+                IsolatedStorageFileStream fs =
+                    IsolatedStorageFile.GetUserStoreForApplication().OpenFile(IMAGECACHEFILE,FileMode.Open);
+
+                DataContractSerializer dcs = new DataContractSerializer(typeof(Dictionary<string, ImageCacheItem>));
+                imageCache = (Dictionary<string, ImageCacheItem>)dcs.ReadObject(fs);
+                fs.Close();
+            }
+            else
+            {
+                imageCache = new Dictionary<string, ImageCacheItem>();
+            }
+        }
+
+        //Speichern der Bildinformationen
+        internal static void SaveCachedImageInfo()
+        {
+            IsolatedStorageFileStream fs =
+                IsolatedStorageFile.GetUserStoreForApplication().CreateFile(IMAGECACHEFILE);
+
+            DataContractSerializer dcs = new DataContractSerializer(typeof(Dictionary<string, ImageCacheItem>));
+            dcs.WriteObject(fs, imageCache);
+            fs.Flush();
+            fs.Close();
+        }
+    }
+}