void ReadCallback(IAsyncResult result)
{
GetTileData data = (GetTileData)result.AsyncState;
try
{
int read = data.ResponseStream.EndRead(result);
if (read > 0)
{
data.MemoryStream.Write(data.Buffer, 0, read);
data.ResponseStream.BeginRead(data.Buffer, 0, data.Buffer.Length, new AsyncCallback(ReadCallback), data);
}
else
{
using (data)
{
string tilePath = GetTilePathForKey(data.Key);
using (FileStream file = new FileStream(tilePath, FileMode.Create, FileAccess.Write))
{
file.Write(data.MemoryStream.GetBuffer(), 0, (int)data.MemoryStream.Length);
}
data.MemoryStream.Seek(0, SeekOrigin.Begin);
IMapDrawable pbitmap = data.Renderer.GetBitmapFromStream(this, data.MemoryStream);
if (pbitmap == null)
{
throw new Exception();
}
TileCache[data.Key] = new TileData(pbitmap);
data.Callback(data.State);
}
}
}
catch (Exception e)
{
CleanupTileData(data);
}
}
void GetTile(object o)
{
using (GetTileData data = (GetTileData)o)
{
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(data.Uri);
request.Timeout = 15000;
request.Method = "GET";
request.UserAgent = "Windows-RSS-Platform/1.0 (MSIE 7.0; Windows NT 5.1)";
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
if (response.StatusCode != HttpStatusCode.OK)
{
throw new Exception("Error while downloading tile.");
}
if (TileCache != null)
{
using (Stream s = response.GetResponseStream())
{
using (MemoryStream mem = new MemoryStream())
{
int read = 0;
byte[] buffer = new byte[10000];
do
{
read = s.Read(buffer, 0, buffer.Length);
mem.Write(buffer, 0, read);
}while (read != 0);
mem.Seek(0, SeekOrigin.Begin);
string tilePath = GetTilePathForKey(data.Key);
using (FileStream file = new FileStream(tilePath, FileMode.Create, FileAccess.Write))
{
file.Write(mem.GetBuffer(), 0, (int)mem.Length);
}
IMapDrawable pbitmap = data.Renderer.GetBitmapFromStream(this, mem);
if (pbitmap == null)
{
throw new Exception();
}
TileCache[data.Key] = new TileData(pbitmap);
}
}
if (data.Callback != null)
{
data.Callback(data.State);
}
}
}
}
catch (Exception e)
{
if (TileCache != null)
{
//TileCache.Remove(data.Key);
TileCache[data.Key] = InvalidTile;
}
}
}
}