/// <summary>
/// Serializes the specified o.
/// </summary>
/// <param name="o">The o.</param>
/// <param name="sb">The sb.</param>
public override void Serialize(object o, StringBuilder sb)
{
string id = Guid.NewGuid().ToString();
AjaxBitmap b = new AjaxBitmap();
b.bmp = o as Bitmap;
b.mimeType = this.mimeType;
b.quality = this.quality;
System.Web.HttpContext.Current.Cache.Add(id, b,
null,
System.Web.Caching.Cache.NoAbsoluteExpiration,
TimeSpan.FromSeconds(30),
System.Web.Caching.CacheItemPriority.BelowNormal,
#if (NET20)
RemoveBitmapFromCache
#else
new System.Web.Caching.CacheItemRemovedCallback(RemoveBitmapFromCache)
#endif
);
sb.Append("new ");
sb.Append(clientType);
sb.Append("('");
sb.Append(id);
sb.Append("')");
}
/// <summary>
/// Removes the bitmap from cache.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="o">The o.</param>
/// <param name="reason">The reason.</param>
public static void RemoveBitmapFromCache(string key, object o, System.Web.Caching.CacheItemRemovedReason reason)
{
if (o != null)
{
AjaxBitmap b = o as AjaxBitmap;
if (b != null && b.bmp != null)
{
b.bmp.Dispose();
}
}
}
/// <summary>
/// Enables processing of HTTP Web requests by a custom HttpHandler that implements the <see cref="T:System.Web.IHttpHandler"></see> interface.
/// </summary>
/// <param name="context">An <see cref="T:System.Web.HttpContext"></see> object that provides references to the intrinsic server objects (for example, Request, Response, Session, and Server) used to service HTTP requests.</param>
public void ProcessRequest(HttpContext context)
{
string id = System.IO.Path.GetFileNameWithoutExtension(context.Request.FilePath);
AjaxBitmap b = null;
try
{
Guid guid = new Guid(id);
b = context.Cache[id] as AjaxBitmap;
}
catch (Exception) { }
if (b == null || b.bmp == null)
{
b.bmp = new Bitmap(10, 20);
Graphics g = Graphics.FromImage(b.bmp);
g.FillRectangle(new SolidBrush(Color.White), 0, 0, 10, 20);
g.DrawString("?", new Font("Arial", 10), new SolidBrush(Color.Red), 0, 0);
}
context.Response.ContentType = b.mimeType;
if (b.mimeType.ToLower() == "image/jpeg")
{
ImageCodecInfo[] enc = ImageCodecInfo.GetImageEncoders();
EncoderParameters ep = new EncoderParameters(1);
ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, b.quality);
b.bmp.Save(context.Response.OutputStream, enc[1], ep);
return;
}
else
{
switch (b.mimeType.ToLower())
{
case "image/gif":
b.bmp.Save(context.Response.OutputStream, ImageFormat.Gif);
return;
case "image/png":
b.bmp.Save(context.Response.OutputStream, ImageFormat.Png);
return;
}
}
throw new NotSupportedException("'" + b.mimeType + "' is not supported.");
}
/// <summary>
/// Serializes the specified o.
/// </summary>
/// <param name="o">The o.</param>
/// <param name="sb">The sb.</param>
public override void Serialize(object o, StringBuilder sb)
{
string id = Guid.NewGuid().ToString();
AjaxBitmap b = new AjaxBitmap();
b.bmp = o as Bitmap;
b.mimeType = this.mimeType;
b.quality = this.quality;
System.Web.HttpContext.Current.Cache.Add(id, b,
null,
System.Web.Caching.Cache.NoAbsoluteExpiration,
TimeSpan.FromSeconds(30),
System.Web.Caching.CacheItemPriority.BelowNormal,
#if(NET20)
RemoveBitmapFromCache
#else
new System.Web.Caching.CacheItemRemovedCallback(RemoveBitmapFromCache)
#endif
);
sb.Append("new ");
sb.Append(clientType);
sb.Append("('");
sb.Append(id);
sb.Append("')");
}