public void Dispose()
{
Stop();
if (--fdlCount == 0)
{
EventMgr.single.RemoveListener("DownFileEvent", DownLoadCallBack);
}
_onDownload = null;
}
public void Start(OnDownLoad callback, Action action = Action.DownFile)
{
try
{
if (_state == State.Doing)
{
throw(new Exception("last request not over"));
}
_onDownload = callback;
_state = State.Doing;
_action = action;
_cancel = false;
_request = HttpWebRequest.Create(new Uri(_url)) as HttpWebRequest;
_request.KeepAlive = false;
//_request.Timeout=TimeOut;//Timeout,ReadWriteTimeout对于异步请求无效,需自己实现超时
//_request.ReadWriteTimeout=TimeOut;
_timeout = new System.Timers.Timer(1000);
_timeout.Elapsed += new ElapsedEventHandler(TimeOutCallBack);
_timeout.Enabled = true;
switch (_action)
{
case Action.DownFile:
_file = new FileStream(_path, FileMode.OpenOrCreate, FileAccess.Write);
if (_file.Length > 0)
{
_file.Position = _file.Length - 1; //range设置到文件尾请求会返回错误
}
_request.AddRange("bytes", (int)_file.Position);
if (_buf == null)
{
_buf = new byte[RecvBuffSize];
}
break;
case Action.CalcSize:
_size = 0;
_dsize = 0;
break;
}
_request.BeginGetResponse(new AsyncCallback(ResponseCallback), this);
OnProgress(this);
}
catch (Exception e)
{
Log.e(e, Log.Tag.Default, e.StackTrace);
OnDownFailed(this);
}
}
