private void ReadCallBack(IAsyncResult asyncResult)
{
Encoding encoding = Encoding.UTF8;
// Get the RequestState object from AsyncResult.
WebRequestState rs = (WebRequestState)asyncResult.AsyncState;
// Retrieve the ResponseStream that was set in RespCallback.
Stream responseStream = rs.ResponseStreamAsync;
// Read rs.BufferRead to verify that it contains data.
int read = responseStream.EndRead(asyncResult);
if (read > 0)
{
// Convert byte stream to Char array and then to String.
// len contains the number of characters converted to Unicode.
ResponseStream.Write(rs.BufferRead, 0, read);
// Continue reading data until
// responseStream.EndRead returns –1.
IAsyncResult ar = responseStream.BeginRead(
rs.BufferRead, 0, BUFFER_SIZE,
new AsyncCallback(ReadCallBack), rs);
}
else
{
if (ResponseStream.Length > 0)
{
ResponseStream.Position = 0;
Complete = true;
Success = true;
if (CallbackSuccess != null)
{
CallbackSuccess(this);
}
}
else
{
Complete = true;
Success = false;
if (CallbackFail != null)
{
CallbackFail(this);
}
}
// Close down the response stream.
responseStream.Close();
// Set the ManualResetEvent so the main thread can exit.
allDone.Set();
}
return;
}
private void ReadCallBack(IAsyncResult asyncResult)
{
// Get the RequestState object from AsyncResult.
WebRequestState rs = (WebRequestState)asyncResult.AsyncState;
// Retrieve the ResponseStream that was set in RespCallback.
Stream responseStream = rs.ResponseStream;
// Read rs.BufferRead to verify that it contains data.
int read = responseStream.EndRead(asyncResult);
if (read > 0)
{
// Prepare a Char array buffer for converting to Unicode.
Char[] charBuffer = new Char[BUFFER_SIZE];
// Convert byte stream to Char array and then to String.
// len contains the number of characters converted to Unicode.
int len =
rs.StreamDecode.GetChars(rs.BufferRead, 0, read, charBuffer, 0);
String str = new String(charBuffer, 0, len);
// Append the recently read data to the RequestData stringbuilder
// object contained in RequestState.
rs.RequestData.Append(
Encoding.UTF8.GetString(rs.BufferRead, 0, read));
// Continue reading data until
// responseStream.EndRead returns –1.
IAsyncResult ar = responseStream.BeginRead(
rs.BufferRead, 0, BUFFER_SIZE,
new AsyncCallback(ReadCallBack), rs);
}
else
{
if (rs.RequestData.Length > 0)
{
// Display data to the console.
HtmlStringbuilder = rs.RequestData;
if (Callback != null)
{
Callback(this);
}
}
// Close down the response stream.
responseStream.Close();
// Set the ManualResetEvent so the main thread can exit.
allDone.Set();
}
return;
}
public ManualResetEvent GetAsync()
{
// Create the state object.
WebRequestState rs = new WebRequestState(this);
// Put the request into the state object so it can be passed around.
rs.Request = Request;
// Issue the async request.
IAsyncResult r = (IAsyncResult)Request.BeginGetResponse(
new AsyncCallback(RespCallback), rs);
return(allDone);
}
private void RespCallback(IAsyncResult ar)
{
// Get the RequestState object from the async result.
WebRequestState rs = (WebRequestState)ar.AsyncState;
// Get the WebRequest from RequestState.
IHttpWebRequest req = rs.Request;
req.Timeout = Timeout;
req.Headers["UserAgent"] = UserAgent;
try
{
// Call EndGetResponse, which produces the WebResponse object
// that came from the request issued above.
Response = (IHttpWebResponse)req.EndGetResponse(ar);
}
catch (WebException e)
{
Complete = true;
Success = false;
WebException = e;
if (CallbackFail != null)
{
CallbackFail(this);
}
allDone.Set();
return;
}
ResponseEncoding = CsqWebRequest.GetEncoding(Response);
// Start reading data from the response stream.
Stream responseStream = Response.GetResponseStream();
// Store the response stream in RequestState to read
// the stream asynchronously.
rs.ResponseStreamAsync = responseStream;
ResponseStream = new MemoryStream();
// Pass rs.BufferRead to BeginRead. Read data into rs.BufferRead
IAsyncResult iarRead = responseStream.BeginRead(rs.BufferRead, 0,
BUFFER_SIZE, new AsyncCallback(ReadCallBack), rs);
}
private void RespCallback(IAsyncResult ar)
{
// Get the RequestState object from the async result.
WebRequestState rs = (WebRequestState)ar.AsyncState;
// Get the WebRequest from RequestState.
WebRequest req = rs.Request;
// Call EndGetResponse, which produces the WebResponse object
// that came from the request issued above.
WebResponse resp = req.EndGetResponse(ar);
// Start reading data from the response stream.
Stream ResponseStream = resp.GetResponseStream();
// Store the response stream in RequestState to read
// the stream asynchronously.
rs.ResponseStream = ResponseStream;
// Pass rs.BufferRead to BeginRead. Read data into rs.BufferRead
IAsyncResult iarRead = ResponseStream.BeginRead(rs.BufferRead, 0,
BUFFER_SIZE, new AsyncCallback(ReadCallBack), rs);
}
/// <summary>
/// Begin the async request
/// </summary>
/// <returns></returns>
public ManualResetEvent GetAsync()
{
Started = DateTime.Now;
// Create the state object.
WebRequestState rs = new WebRequestState(this);
// Put the request into the state object so it can be passed around.
rs.Request = Request;
// Issue the async request.
IAsyncResult r = (IAsyncResult)Request.BeginGetResponse(
new AsyncCallback(RespCallback), rs);
return allDone;
}
