我如何重用套接字？ [英] How do I reuse a socket?
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问题描述
这几乎与ASync客户端/服务器TCPIP应用程序的Microsoft示例相同，我所做的唯一更改是支持IPV6和再次收听下一个连接。这是我遇到问题的地方，再次听。我试过处理插座，但这似乎没有帮助。我不断收到此错误：
5/3/2014 7:45:32 PM，每个套接字地址（协议/网络地址/端口）只有一种用法是通常允许，在System.Net.Sockets.Socket.DoBind（EndPoint endPointSnapshot，SocketAddress socketAddress）
在System.Net.Sockets.Socket.Bind（EndPoint localEP）
在CInstaller.CInstall.WaitForConnection（）CInstall.cs：第163行
我在ReadCallback结束时启动一个新线程，等待另一个连接。我已经指出了第163行的位置<<<<问题专线
非常感谢任何帮助...
谢谢，
Glenn
Hi,
This is almost identical to the Microsoft example of an ASync Client/Server TCPIP application, the only changes I've made is to support IPV6 and to listen again for the next connection. This is where I've come into a problem, listening again. I've tried disposing of the socket but that doesn't seem to help. I continuously receive this error:
5/3/2014 7:45:32 PM, Only one usage of each socket address (protocol/network address/port) is normally permitted, at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.Sockets.Socket.Bind(EndPoint localEP)
at CInstaller.CInstall.WaitForConnection() CInstall.cs:line 163
I start a new thread at the end of ReadCallback to wait for another connection. I've indicated where line 163 is below with <<<< Problem Line
Any help is greatly appreciated...
Thanks,
Glenn
private void WaitForConnection()
{
string work;
Int32 port;
byte[] bytes = new Byte[1024];
try
{
if (string.IsNullOrEmpty(GetSet.TCPIPPort))
{
Thread.Sleep(200);
if (string.IsNullOrEmpty(GetSet.TCPIPPort))
{
if (!EventLog.SourceExists(GetSet.ProductName))
EventLog.CreateEventSource(GetSet.ProductName, "Application");
eventLogInstaller.Source = GetSet.ProductName;
eventLogInstaller.Log = "Application";
work = string.Format("{0}, {1}: ", DateTime.Now, "TCPIP Port not set, service terminating.");
eventLogInstaller.WriteEntry(work);
this.Stop();
}
}
port = Convert.ToInt32(GetSet.TCPIPPort);
// Establish the local endpoint for the socket.
// The DNS name of the computer
// running the listener is
IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, port);
// Create a TCP/IP socket.
Socket listener = new Socket(ipAddress.AddressFamily,
SocketType.Stream, ProtocolType.Tcp);
work = string.Format("{0} {1} - Waiting for connection on IPAddress: {2}, port {3}",
GetSet.ProductName, DateTime.Now, ipAddress, GetSet.TCPIPPort);
Trace.WriteLine(work);
// Bind the socket to the local endpoint and listen for incoming connections.
listener.Bind(localEndPoint); // <<<<< Problem line
listener.Listen(100);
while (true)
{
// Set the event to nonsignaled state.
allDone.Reset();
// Start an asynchronous socket to listen for connections.
listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);
// Wait until a connection is made before continuing.
allDone.WaitOne();
break;
}
}
catch (Exception ex)
{
if (!EventLog.SourceExists(GetSet.ProductName))
EventLog.CreateEventSource(GetSet.ProductName, "Application");
eventLogInstaller.Source = GetSet.ProductName;
eventLogInstaller.Log = "Application";
work = string.Format("{0}, {1}, {2}", DateTime.Now, ex.Message, ex.StackTrace);
eventLogInstaller.WriteEntry(work);
Trace.WriteLine(work);
return;
}
}
public void AcceptCallback(IAsyncResult ar)
{
try
{
work = string.Format("{0} {1} - AcceptCallback Start",
GetSet.ProductName, DateTime.Now);
Trace.WriteLine(work);
// Signal the main thread to continue.
allDone.Set();
// Get the socket that handles the client request.
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
// Create the state object.
StateObject state = new StateObject();
state.workSocket = handler;
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
work = string.Format("{0} {1} - AcceptCallback End",
GetSet.ProductName, DateTime.Now);
Trace.WriteLine(work);
}
catch (Exception ex)
{
if (!EventLog.SourceExists(GetSet.ProductName))
EventLog.CreateEventSource(GetSet.ProductName, "Application");
eventLogInstaller.Source = GetSet.ProductName;
eventLogInstaller.Log = "Application";
work = string.Format("{0}, {1}, {2}", DateTime.Now, ex.Message, ex.StackTrace);
eventLogInstaller.WriteEntry(work);
Trace.WriteLine(work);
return;
}
}
public void ReadCallback(IAsyncResult ar)
{
String content = String.Empty;
Thread threadProcessMessage;
try
{
work = string.Format("{0} {1} - ReadCallback Start",
GetSet.ProductName, DateTime.Now);
Trace.WriteLine(work);
// Retrieve the state object and the handler socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;
// Read data from the client socket.
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
// There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
// Check for end-of-file tag. If it is not there, read
// more data.
content = state.sb.ToString();
if (content.IndexOf("<EOF>") > -1)
{
GetSet.Message = content;
// All the data has been read from the client, write it to trace file
mreInstallThread.Reset();
threadProcessMessage = new Thread(new ThreadStart(ProcessMessage));
threadProcessMessage.Start();
work = string.Format("Read {0} bytes from socket. \n Data : {1}", content.Length, content);
Trace.WriteLine(work);
// Echo the data back to the client.
Send(handler, content);
mreInstallThread.WaitOne(375);
}
else
{
// Not all data received. Get more.
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}
}
Thread.Sleep(1000);
GetSet.threadInstallComm = new Thread(new ThreadStart(WaitForConnection));
GetSet.threadInstallComm.Start();
work = string.Format("{0} {1} - ReadCallback End",
GetSet.ProductName, DateTime.Now);
Trace.WriteLine(work);
}
catch (Exception ex)
{
if (!EventLog.SourceExists(GetSet.ProductName))
EventLog.CreateEventSource(GetSet.ProductName, "Application");
eventLogInstaller.Source = GetSet.ProductName;
eventLogInstaller.Log = "Application";
work = string.Format("{0}, {1}, {2}", DateTime.Now, ex.Message, ex.StackTrace);
eventLogInstaller.WriteEntry(work);
Trace.WriteLine(work);
return;
}
}
private void Send(Socket handler, String data)
{
try
{
work = string.Format("{0} {1} - Send Start",
GetSet.ProductName, DateTime.Now);
Trace.WriteLine(work);
// Convert the string data to byte data using ASCII encoding.
byte[] byteData = Encoding.ASCII.GetBytes(data);
// Begin sending the data to the remote device.
handler.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), handler);
work = string.Format("{0} {1} - Send End",
GetSet.ProductName, DateTime.Now);
Trace.WriteLine(work);
}
catch (Exception ex)
{
if (!EventLog.SourceExists(GetSet.ProductName))
EventLog.CreateEventSource(GetSet.ProductName, "Application");
eventLogInstaller.Source = GetSet.ProductName;
eventLogInstaller.Log = "Application";
work = string.Format("{0}, {1}, {2}", DateTime.Now, ex.Message, ex.StackTrace);
eventLogInstaller.WriteEntry(work);
Trace.WriteLine(work);
return;
}
}
private void SendCallback(IAsyncResult ar)
{
try
{
work = string.Format("{0} {1} - SendCallback Start",
GetSet.ProductName, DateTime.Now);
Trace.WriteLine(work);
// Retrieve the socket from the state object.
Socket handler = (Socket)ar.AsyncState;
// Complete sending the data to the remote device.
int bytesSent = handler.EndSend(ar);
work = string.Format("Sent {0} bytes to client.", bytesSent);
Trace.WriteLine(work);
handler.Shutdown(SocketShutdown.Both);
handler.Close();
work = string.Format("{0} {1} - SendCallback End",
GetSet.ProductName, DateTime.Now);
Trace.WriteLine(work);
}
catch (Exception ex)
{
if (!EventLog.SourceExists(GetSet.ProductName))
EventLog.CreateEventSource(GetSet.ProductName, "Application");
eventLogInstaller.Source = GetSet.ProductName;
eventLogInstaller.Log = "Application";
work = string.Format("{0}, {1}, {2}", DateTime.Now, ex.Message, ex.StackTrace);
eventLogInstaller.WriteEntry(work);
Trace.WriteLine(work);
return;
}
}
推荐答案
在WaitForConnection方法中删除while循环中的break后，不再需要再次调用WaitForConnection方法。这解决了这个问题。
After removing the "break" in the while loop in the WaitForConnection method there is no longer a need to call the WaitForConnection method again. This resolved the problem.
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