private static void GetResponseCallback(IAsyncResult ar)
{
HttpClientHelper dlf = (HttpClientHelper)ar.AsyncState;
try
{
dlf.m_reponse = (HttpWebResponse)dlf.m_request.EndGetResponse(ar);
HttpStatusCode code = dlf.m_reponse.StatusCode;
if (code == HttpStatusCode.Found ||
code == HttpStatusCode.Redirect ||
code == HttpStatusCode.Moved ||
code == HttpStatusCode.MovedPermanently)
{
dlf.m_redirectURL = dlf.m_reponse.Headers["Location"];
dlf.Close(HTTP_OP_RET.failed, (int)code, dlf.m_reponse.StatusDescription);
return;
}
dlf.m_totalSize = dlf.m_reponse.ContentLength;
dlf.m_responseStream = dlf.m_reponse.GetResponseStream();
dlf.m_fileBuffStream = new MemoryStream();
dlf.m_opStep = HTTP_OP_STEP.downloading;
IAsyncResult iarRead = dlf.m_responseStream.BeginRead(dlf.m_buffer, 0, BUFFER_SIZE, new AsyncCallback(ReadCallback), dlf);
ThreadPool.RegisterWaitForSingleObject(iarRead.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), dlf, TIMEOUT, true);
}
catch (WebException e)
{
HttpStatusCode code = HttpStatusCode.BadRequest;
if (e.Status == WebExceptionStatus.Timeout)
{
code = HttpStatusCode.RequestTimeout;
}
else if (e.Status == WebExceptionStatus.ConnectFailure)
{
code = HttpStatusCode.InternalServerError;
}
else
{
HttpWebResponse response = e.Response as HttpWebResponse;
code = response.StatusCode;
}
dlf.Close(HTTP_OP_RET.failed, (int)code, e.ToString());
}
catch (Exception e)
{
dlf.Close(HTTP_OP_RET.failed, -1, e.ToString());
}
}
private static void TimeoutCallback(object state, bool timeOut)
{
HttpClientHelper dlf = (HttpClientHelper)state;
if (timeOut)
{
dlf.Close(HTTP_OP_RET.time_out, (int)HttpStatusCode.RequestTimeout, "");
}
}
private static void ReadCallback(IAsyncResult asyncResult)
{
HttpClientHelper dlf = (HttpClientHelper)asyncResult.AsyncState;
if (dlf.m_responseStream == null)
{
return;
}
try
{
int read = dlf.m_responseStream.EndRead(asyncResult);
if (read > 0)
{
dlf.m_fileBuffStream.Write(dlf.m_buffer, 0, read);
dlf.m_downloadSize += read;
if (dlf.m_downloadSize < dlf.m_totalSize)
{
IAsyncResult iarRead = dlf.m_responseStream.BeginRead(dlf.m_buffer, 0, BUFFER_SIZE, new AsyncCallback(ReadCallback), dlf);
ThreadPool.RegisterWaitForSingleObject(iarRead.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), dlf, TIMEOUT, true);
}
else
{
dlf.Close(HTTP_OP_RET.succ, (int)HttpStatusCode.OK, "");
}
}
else
{
//TODO: kevin. will it raise an excpetion ?
//dlf.Close(HTTP_OP_RET.failed, -1, "ReadCallback");
}
}
catch (WebException e)
{
HttpWebResponse response = e.Response as HttpWebResponse;
dlf.Close(HTTP_OP_RET.failed, (int)response.StatusCode, e.ToString());
}
catch (Exception e)
{
dlf.Close(HTTP_OP_RET.failed, -1, e.ToString());
}
}
