Load images within datapacket delayed and cache them locally

ClientServerLib/ClientServerLib/CServer.cs

@@ -68,6 +68,13 @@ namespace ServerLib
             set { CServer.getSiteFile = value; }
         }
 
+        private static GetDelayedImageDelegate getDelayedImage;
+        public static GetDelayedImageDelegate GetDelayedImage
+        {
+            internal get { return CServer.getDelayedImage; }
+            set { CServer.getDelayedImage = value; }
+        }
+
         #endregion
 
         #region songs

ClientServerLib/ClientServerLib/CWebservice.cs

@@ -96,6 +96,12 @@ namespace ServerLib
             UriTemplate = "/img/{filename}")]
         Stream GetImgFile(String filename);
 
+        [OperationContract]
+        [WebInvoke(Method = "GET",
+            ResponseFormat = WebMessageFormat.Json,
+            UriTemplate = "/delayedImage?id={id}")]
+        Base64Image GetDelayedImage(String id);
+
         #endregion
 
         #region songs
@@ -382,6 +388,11 @@ namespace ServerLib
             }
         }
 
+        public Base64Image GetDelayedImage(string id)
+        {
+            return CServer.GetDelayedImage(id);
+        }
+
         #endregion
 
         #region songs

ClientServerLib/ClientServerLib/DataStructs.cs

@@ -58,6 +58,8 @@ namespace ServerLib
 
     public delegate byte[] GetSiteFileDelegate(string filename);
 
+    public delegate Base64Image GetDelayedImageDelegate(string hashedFilename);
+
     #endregion
 
     [DataContract]
@@ -66,6 +68,9 @@ namespace ServerLib
         [DataMember]
         private string base64Data = "";
 
+        [DataMember]
+        private string imageId = "";
+
         public Base64Image(Image img, ImageFormat format)
         {
             MemoryStream ms = new MemoryStream();
@@ -74,6 +79,11 @@ namespace ServerLib
             base64Data = "data:image/" + formatString + ";base64," + Convert.ToBase64String(ms.ToArray());
         }
 
+        public Base64Image(string imageId)
+        {
+            this.imageId = imageId;
+        }
+
         public Image getImage()
         {
             string onlyBase64Data = base64Data.Substring(base64Data.IndexOf(";base64,") + (";base64,").Length);