private static void ReadCallBack(IAsyncResult asyncResult)
{
int Success = 0;
int ErrCode = 0;
Exception Error = null;
HttpTask task = (HttpTask)asyncResult.AsyncState;
try
{
int read = task.streamResponse.EndRead(asyncResult);
// Read the HTML page and then print it to the console.
if (read > 0)
{
task.streamWriter.Write(task.BufferRead, 0, read);
task.mOffset += read;
int Percent = task.mLength > 0 ? (int)((Int64)100 * task.mOffset / task.mLength) : -1;
if (Percent != task.mOldPercent)
{
task.mOldPercent = Percent;
task.mDispatcher.Invoke(new Action(() =>
{
task.Progress?.Invoke(task, new ProgressEventArgs(Percent));
}));
}
// setup next read
task.streamResponse.BeginRead(task.BufferRead, 0, BUFFER_SIZE, new AsyncCallback(ReadCallBack), task);
return;
}
else
{
// this is done on finisch
//task.streamWriter.Close();
//task.streamResponse.Close();
Success = 1;
}
}
catch (Exception e)
{
ErrCode = -3;
Error = e;
Console.WriteLine("\nReadCallBack Exception raised!");
Console.WriteLine("\nMessage:{0}", e.Message);
}
task.mDispatcher.Invoke(new Action(() =>
{
task.Finish(Success, ErrCode, Error);
}));
}
private static void RespCallback(IAsyncResult asynchronousResult)
{
int Success = 0;
int ErrCode = 0;
Exception Error = null;
HttpTask task = (HttpTask)asynchronousResult.AsyncState;
try
{
// State of request is asynchronous.
task.response = (HttpWebResponse)task.request.EndGetResponse(asynchronousResult);
ErrCode = (int)task.response.StatusCode;
Console.WriteLine("The server at {0} returned {1}", task.response.ResponseUri, task.response.StatusCode);
string fileName = Path.GetFileName(task.response.ResponseUri.ToString());
task.lastTime = DateTime.Now;
Console.WriteLine("With headers:");
foreach (string key in task.response.Headers.AllKeys)
{
Console.WriteLine("\t{0}:{1}", key, task.response.Headers[key]);
if (key.Equals("Content-Length", StringComparison.CurrentCultureIgnoreCase))
{
task.mLength = int.Parse(task.response.Headers[key]);
}
else if (key.Equals("Content-Disposition", StringComparison.CurrentCultureIgnoreCase))
{
string cd = task.response.Headers[key];
fileName = cd.Substring(cd.IndexOf("filename=") + 9).Replace("\"", "");
}
else if (key.Equals("Last-Modified", StringComparison.CurrentCultureIgnoreCase))
{
task.lastTime = DateTime.Parse(task.response.Headers[key]);
}
}
//Console.WriteLine(task.lastTime);
if (task.mDlName == null)
{
task.mDlName = fileName;
}
FileInfo testInfo = new FileInfo(task.mDlPath + @"\" + task.mDlName);
if (testInfo.Exists && testInfo.LastWriteTime == task.lastTime && testInfo.Length == task.mLength)
{
task.request.Abort();
Success = 2;
}
else
{
// prepare download filename
if (!Directory.Exists(task.mDlPath))
{
Directory.CreateDirectory(task.mDlPath);
}
if (task.mDlName.Length == 0 || task.mDlName[0] == '?')
{
task.mDlName = GetNextTempFile(task.mDlPath, "Download");
}
FileInfo info = new FileInfo(task.mDlPath + @"\" + task.mDlName + ".tmp");
if (info.Exists)
{
info.Delete();
}
// Read the response into a Stream object.
task.streamResponse = task.response.GetResponseStream();
task.streamWriter = info.OpenWrite();
// Begin the Reading of the contents of the HTML page and print it to the console.
task.streamResponse.BeginRead(task.BufferRead, 0, BUFFER_SIZE, new AsyncCallback(ReadCallBack), task);
return;
}
}
catch (WebException e)
{
if (e.Response != null)
{
string fileName = Path.GetFileName(e.Response.ResponseUri.AbsolutePath.ToString());
if (task.mDlName == null)
{
task.mDlName = fileName;
}
FileInfo testInfo = new FileInfo(task.mDlPath + @"\" + task.mDlName);
if (testInfo.Exists)
{
Success = 2;
}
}
if (Success == 0)
{
ErrCode = -2;
Error = e;
Console.WriteLine("\nRespCallback Exception raised!");
Console.WriteLine("\nMessage:{0}", e.Message);
Console.WriteLine("\nStatus:{0}", e.Status);
}
}
catch (Exception e)
{
ErrCode = -2;
Error = e;
Console.WriteLine("\nRespCallback Exception raised!");
Console.WriteLine("\nMessage:{0}", e.Message);
}
task.mDispatcher.Invoke(new Action(() =>
{
task.Finish(Success, ErrCode, Error);
}));
}