void StreamCallback(IAsyncResult result)
{
FileDownLoad fdl = null;
try
{
fdl = (FileDownLoad)result.AsyncState;
Interlocked.Exchange(ref fdl._timecount, 0);
int n = fdl._stream.EndRead(result);
if (n <= 0)
{
throw new Exception("HttpWebResponse read exception");
}
fdl._file.Write(fdl._buf, 0, n);
fdl._file.Flush();
_dsize -= n;
//继续读数据
if (_dsize > 0)
{
OnProgress(fdl);
fdl._stream.BeginRead(fdl._buf, 0, _dsize > RecvBuffSize?RecvBuffSize:_dsize, new AsyncCallback(StreamCallback), fdl);
}
else
{
OnDownComplete(fdl);
}
}
catch (Exception e)
{
Log.e(e, Log.Tag.Default, e.StackTrace);
OnDownFailed(fdl);
}
}
static void DownLoadCallBack(EventMgr.EventData eb)
{
FileDownLoad fdl = eb.data as FileDownLoad;
if (null == fdl._onDownload)
{
return;
}
fdl._onDownload(fdl);
if (fdl.state == State.Doing)
{
return;
}
fdl._onDownload = null;
}
void OnDownFailed(FileDownLoad fdl)
{
switch (fdl.action)
{
case Action.DownFile:
fdl._info = _cancel?"下载已暂停":"下载文件失败";
break;
case Action.CalcSize:
fdl._info = "获取文件大小失败";
break;
}
fdl._state = State.Failed;
fdl.innerStop();
EventMgr.single.PostEvent("DownFileEvent", fdl);
}
void ResponseCallback(IAsyncResult result)
{
FileDownLoad fdl = null;
try
{
fdl = (FileDownLoad)result.AsyncState;
Interlocked.Exchange(ref fdl._timecount, 0);
fdl._response = fdl._request.EndGetResponse(result) as HttpWebResponse;
switch (_action)
{
case Action.CalcSize:
int fsize = File.Exists(_path)?(int)(new FileInfo(_path).Length):0;
fdl._size = (int)fdl._response.ContentLength;
if (fdl._size <= 0)
{
throw new Exception("invalid url");
}
fdl._dsize = fdl._size - fsize;
OnDownComplete(fdl);
break;
case Action.DownFile:
fdl._stream = fdl._response.GetResponseStream();
fdl._size = (int)(_file.Position + fdl._response.ContentLength);
fdl._dsize = (int)fdl._response.ContentLength;
if (_dsize > 0)
{
fdl._stream.BeginRead(fdl._buf, 0, _dsize > RecvBuffSize?RecvBuffSize:_dsize, new AsyncCallback(StreamCallback), fdl);
}
else
{
OnDownComplete(fdl);
}
break;
}
}
catch (Exception e)
{
Log.e(e, Log.Tag.Default, e.StackTrace);
OnDownFailed(fdl);
}
}
void OnDownComplete(FileDownLoad fdl)
{
fdl._state = State.Completed;
fdl.innerStop();
EventMgr.single.PostEvent("DownFileEvent", fdl);
}
void OnProgress(FileDownLoad fdl)
{
EventMgr.single.PostEvent("DownFileEvent", fdl);
}
