private void _BeginGetResponseCallback(IAsyncResult asynchronousResult)
{
RetrieveResult ret = null;
MyRequest myRequestState = (MyRequest)asynchronousResult.AsyncState;
try
{
// State of request is asynchronous.
WebRequest myHttpWebRequest = myRequestState.Request;
myRequestState.Response = (HttpWebResponse)myHttpWebRequest.EndGetResponse(asynchronousResult);
// Read the response into a Stream object.
Stream responseStream = myRequestState.Response.GetResponseStream();
myRequestState.Stream = responseStream;
string metar = retr.DecodeWMOCode(responseStream);
myRequestState.Stream.Close();
myRequestState.Response.Close();
ret = new RetrieveResult(metar);
}
catch (WebException ex)
{
ret = new RetrieveResult(
new Exception("Failed to download data with metar.", ex));
}
myRequestState.Finisher(ret);
}
/// <summary>
/// Used to download metar asynchronously.
/// </summary>
private void DownloadAsynchronously()
{
string icao = aIcao;
RetrieveResult ret = null;
WebRequest req = HttpWebRequest.Create(
retr.GetUrlForICAO(icao));
MyRequest mr = new MyRequest()
{
Request = req,
Finisher = aDel
};
try
{
req.BeginGetResponse(new AsyncCallback(_BeginGetResponseCallback), mr);
}
catch (Exception ex)
{
ret = new RetrieveResult(
new DownloadException("Failed to download metar from web.", ex));
}
if (ret != null)
{
mr.Finisher(ret);
}
}
