private static void SendToClient(object sockfile)
{
SocketAndFileName sf = (SocketAndFileName)sockfile;
try
{
SendFile(sf.Socket, sf.FileName, sf.BreakPoint);
}
catch (System.Net.Sockets.SocketException es)
{
if (es.ErrorCode == 10054)
{
Log("客户端断开", es);
}
else if (es.ErrorCode == 10053)
{
Log("服务器主动断开", es);
}
else
{
Log("SocketException", es);
}
}
catch (Exception e)
{
if (e.GetType().FullName != "System.ObjectDisposedException")
{
Log("Socket已经被销毁", e);
}
else
{
Log("其它异常", e);
}
}
finally
{
sf.Socket.Close();
//sf.Socket.Dispose();
}
}
/// <summary>
/// 开始文件下载服务（在服务器端）
/// </summary>
/// <param name="ip"></param>
/// <param name="port"></param>
/// <param name="maxConnectCount"></param>
public static void StartDownloadServer(string ip, int port, int maxConnectCount = 255)
{
TcpListener serverListener = null;
try
{
//构建监听器
serverListener = new TcpListener(IPAddress.Parse(ip), port);
serverListener.Start(maxConnectCount);
stopServer = false;
//监听客户连线请求
while (!stopServer)
{
Socket socket = serverListener.AcceptSocket(); //有客户请求连接
if (socket == null)
{
continue;
}
byte[] buffer = new Byte[socket.ReceiveBufferSize];
int i = socket.Receive(buffer); //接收请求数据.
if (i <= 0)
{
continue;
}
if (i > 4)
{
byte[] lenBytes = new byte[4];
for (int j = 0; j < 4; j++)
{
lenBytes[j] = buffer[j];
}
byte[] file = new byte[i - 4];
for (int j = 0; j < i - 4; j++)
{
file[j] = buffer[j + 4];
}
int breakPoint = BitConverter.ToInt32(lenBytes, 0);
string filename = Byte2Str(file);
SocketAndFileName sf = new SocketAndFileName();
sf.Socket = socket;
sf.FileName = filename;
sf.BreakPoint = breakPoint;
//采用多线程异步方式处理请求，以便不会阻塞后面的其它请求（以牺牲服务器CPU资源为代价）
Thread thr = new Thread(new ParameterizedThreadStart(SendToClient));
thr.Start(sf);
}
}
}
catch (Exception e)
{
Log("StartDownloadServer出现异常，已停止文件下载服务监听", e);
}
finally
{
if (serverListener != null)
{
serverListener.Stop();
}
stopServer = true;
}
}
