public DownloadState Download(string url, Control ctrl, ProgressDelegate pd)
{
RequestState myRequestState = new RequestState();
try
{
// Create a HttpWebrequest object to the desired URL.
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);
// Create an instance of the RequestState and assign the previous myHttpWebRequest
// object to its request field.
myRequestState.downloadManager = this;
myRequestState.request = myHttpWebRequest;
myRequestState.ctrl = ctrl;
myRequestState.progFormCB = new ProgressFormDelegate(Progress);
myRequestState.progCB = new ProgressDelegate( pd );
// Start the asynchronous request.
IAsyncResult result = (IAsyncResult)myHttpWebRequest.BeginGetResponse(new AsyncCallback(RespCallback), myRequestState);
// this line implements the timeout, if there is a timeout, the callback fires and the request becomes aborted
ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), myHttpWebRequest, DefaultTimeout, true);
// Release the HttpWebResponse resource.
//myRequestState.response.Close();
lock (activeDownloads)
{
activeDownloads.Add(myRequestState);
}
return (DownloadState)myRequestState;
}
catch (WebException e)
{
myRequestState.error = e;
myRequestState.progFormCB(myRequestState.progCB, myRequestState);
/*
Console.WriteLine("\nMain Exception raised!");
Console.WriteLine("\nMessage:{0}", e.Message);
Console.WriteLine("\nStatus:{0}", e.Status);
Console.WriteLine("Press any key to continue..........");
*/
}
catch (Exception e)
{
Console.WriteLine("\nMain Exception raised!");
Console.WriteLine("Source :{0} ", e.Source);
Console.WriteLine("Message :{0} ", e.Message);
Console.WriteLine("Press any key to continue..........");
//Console.Read();
}
return null;
}
/// <summary>
/// Progress callback, called when we've read another packet of data.
/// Used to set info in GUI on % complete & transfer rate.
/// </summary>
private void Progress(ProgressDelegate pd, RequestState ds)
{
if (ds.ctrl != null)
{
if (ds.ctrl.InvokeRequired)
{
ProgressFormDelegate del = new ProgressFormDelegate(Progress);
try
{
ds.ctrl.Invoke(del, new object[] { pd, ds });
}
catch (Exception e)
{
}
}
else
{
pd(ds);
}
}
else
{
pd(ds);
}
}
