public void Dispose()
{
this.disposed = true;
this.info.ProgressCallback -= this.progressCB;
this.downloadTimer.Dispose();
this.info.Dispose();
this.progressCB = null;
this.allDownloadedData = null;
this.downloadTimer = null;
this.info = null;
}
private void ReadCallBack(IAsyncResult asyncResult)
{
lock (this.downloadAbortLock)
{
if (this.disposed || this.downloadAborted)
{
return;
}
// Get the DownloadInfo object from AsyncResult.
DownloadInfo info = (DownloadInfo)asyncResult.AsyncState;
if (info == null)
{
Abort();
}
// Retrieve the ResponseStream that was set in RespCallback.
Stream responseStream = info.ResponseStream;
if (responseStream == null)
{
Abort();
}
// Read info.BufferRead to verify that it contains data.
int bytesRead = responseStream.EndRead(asyncResult);
if (bytesRead > 0)
{
if (info.useFastBuffers)
{
System.Array.Copy(info.BufferRead, 0,
info.dataBufferFast, info.bytesProcessed,
bytesRead);
}
else
{
for (int b = 0; b < bytesRead; b++)
{
info.dataBufferSlow.Add(info.BufferRead[b]);
}
}
info.bytesProcessed += bytesRead;
// Perhaps we didn't originally get the content size, so we're
// just reading data with no end in sight. If that's the casre,
// abort the download if we cross the max download size.
if (info.bytesProcessed > MaxDownloadSizeInBytes)
{
//System.Console.WriteLine("Download has become too big, aborting");
Abort();
return;
}
// If a registered progress-callback, inform it of our
// download progress so far.
if ((info.ProgressCallback != null) && (!this.downloadAborted))
{
info.ProgressCallback(info.Request.RequestUri.AbsoluteUri, info.bytesProcessed, info.dataLength);
}
// Continue reading data until responseStream.EndRead returns –1.
IAsyncResult ar = responseStream.BeginRead(
info.BufferRead, 0, BUFFER_SIZE,
new AsyncCallback(ReadCallBack), info);
}
else
{
// We're done, signal completion
allDone.Set();
}
}
}
private void ResponseCallback(IAsyncResult ar)
{
if (this.disposed || this.downloadAborted)
{
return;
}
// Get the DownloadInfo object from the async result were
// we're storing all of the temporary data and the download
// buffer.
DownloadInfo info = (DownloadInfo)ar.AsyncState;
try
{
// Get the WebRequest from RequestState.
WebRequest req = info.Request;
// Call EndGetResponse, which produces the WebResponse object
// that came from the request issued above.
WebResponse resp = req.EndGetResponse(ar);
// Find the data size from the headers.
string strContentLength = resp.Headers["Content-Length"];
if (strContentLength != null)
{
info.dataLength = Convert.ToInt32(strContentLength);
//System.Console.WriteLine("Size: " + info.dataLength + " for " + this.url);
if (info.dataLength > MaxDownloadSizeInBytes)
{
//System.Console.WriteLine("Download is too big, aborting");
Abort();
return;
}
info.dataBufferFast = new byte[info.dataLength];
}
else
{
info.useFastBuffers = false;
info.dataBufferSlow = new System.Collections.ArrayList(BUFFER_SIZE);
}
// Start reading data from the response stream.
Stream ResponseStream = resp.GetResponseStream();
// Store the response stream in RequestState to read
// the stream asynchronously.
info.ResponseStream = ResponseStream;
// Pass do.BufferRead to BeginRead.
IAsyncResult iarRead = ResponseStream.BeginRead(info.BufferRead,
0,
BUFFER_SIZE,
new AsyncCallback(ReadCallBack),
info);
}
catch (WebException)
{
info.connectionFailed = true;
}
catch (Exception)
{
info.connectionFailed = true;
}
finally
{
if (info.connectionFailed)
{
Abort();
}
}
}
