/// <summary>
/// 读取请求返回的数据
/// </summary>
/// <param name="request">请求对象</param>
/// <returns></returns>
private byte[] GetData(HttpWebRequest request)
{
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream stream = response.GetResponseStream();
responseHeaders = response.Headers;
SaveCookiesToDisk();
DownloadEventArgs args = new DownloadEventArgs();
if (responseHeaders[HttpResponseHeader.ContentLength] != null)
{
args.TotalBytes = Convert.ToInt32(responseHeaders[HttpResponseHeader.ContentLength]);
}
MemoryStream ms = new MemoryStream();
int count = 0;
byte[] buf = new byte[bufferSize];
while ((count = stream.Read(buf, 0, buf.Length)) > 0)
{
ms.Write(buf, 0, count);
if (this.DownloadProgressChanged != null)
{
args.BytesReceived += count;
args.ReceivedData = new byte[count];
Array.Copy(buf, args.ReceivedData, count);
this.DownloadProgressChanged(this, args);
if (args.Canceled)
{
break;
}
}
}
stream.Close();
//解压
if (ResponseHeaders[HttpResponseHeader.ContentEncoding] != null)
{
MemoryStream msTemp = new MemoryStream();
count = 0;
buf = new byte[100];
switch (ResponseHeaders[HttpResponseHeader.ContentEncoding].ToLower())
{
case "gzip":
GZipStream gzip = new GZipStream(ms, CompressionMode.Decompress);
while ((count = gzip.Read(buf, 0, buf.Length)) > 0)
{
msTemp.Write(buf, 0, count);
}
return(msTemp.ToArray());
case "deflate":
DeflateStream deflate = new DeflateStream(ms, CompressionMode.Decompress);
while ((count = deflate.Read(buf, 0, buf.Length)) > 0)
{
msTemp.Write(buf, 0, count);
}
return(msTemp.ToArray());
default:
break;
}
}
return(ms.ToArray());
}
///<summary>
///将网络流保存到指定流
///</summary>
///<param name="toStream">保存位置</param>
///<param name="needProgress">是否显示进度</param>
private void SaveNetworkStream(Stream toStream, bool showProgress)
{
//获取要保存的网络流
NetworkStream NetStream = clientSocket.GetStream();
byte[] buffer = new byte[RECEIVE_BUFFER_SIZE];
int count = 0, startIndex = 0;
MemoryStream ms = new MemoryStream();
for (int i = 0; i < 3; i++)
{
count = NetStream.Read(buffer, 0, 500);
ms.Write(buffer, 0, count);
}
if (ms.Length == 0)
{
NetStream.Close(); throw new Exception("远程服务器没有响应");
}
buffer = ms.GetBuffer();
count = (int)ms.Length;
GetResponseHeader(buffer, out startIndex);//分析响应，获取响应头和响应实体
count -= startIndex;
toStream.Write(buffer, startIndex, count);
DownloadEventArgs e = new DownloadEventArgs();
if (responseHeaders["Content-Length"] != null)
{
e.totalBytes = long.Parse(responseHeaders["Content-Length"]);
}
else
{
e.totalBytes = -1;
}
//启动计时器
System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch();
timer.Start();
do
{
//如果取消就推出
if (isCanceled)
{
break;
}
//显示下载进度
if (showProgress)
{
e.bytesReceived += count;
e.ReceiveProgress = (double)e.bytesReceived / (double)e.totalBytes;
byte[] tempBuffer = new byte[count];
Array.Copy(buffer, startIndex, tempBuffer, 0, count);
e.receivedBuffer = tempBuffer;
double t = (timer.ElapsedMilliseconds + 0.1) / 1000;
e.receiveSpeed = (double)e.bytesReceived / t;
startIndex = 0;
if (DownloadProgressChanged != null)
{
DownloadProgressChanged(this, e);
}
}
//读取网路数据到缓冲区
count = NetStream.Read(buffer, 0, buffer.Length);
//将缓存区数据保存到指定流
toStream.Write(buffer, 0, count);
} while (count > 0);
timer.Stop();//关闭计时器
if (responseHeaders["Content-Length"] != null)
{
toStream.SetLength(long.Parse(responseHeaders["Content-Length"]));
}
//else
//{
// toStream.SetLength(toStream.Length);
// responseHeaders.Add("Content-Length", toStream.Length.ToString());//添加响应标头
//}
toStream.Position = 0;
//关闭网络流和网络连接
NetStream.Close();
clientSocket.Close();
}
