我不得不为工作中的项目编写TCP服务器，然后用Google搜索。我得到了一个MSDN答案，并设法让它工作，但我不知道如何让数据能够来回接收。插座不会连接超过大约30秒MAX（因为我的老板不希望插座在这里的计算机上保持打开状态）。本课程的目标是为我的主程序提供一种快速方法，以检索有关计算机及其用户的数据。
通过命名空间命名，你可能会猜到它是一个计算机实验室。
namespace LabAssist.Server.Common.Objects {
using Atlantis.Net.Sockets;
using LabAssist.Server.Common.Data;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;
public class TcpServer {
#region Constructor(s)
public TcpServer(IPEndPoint endPoint) {
RemoteEndPoint = endPoint;
Host = new Socket(RemoteEndPoint.Address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
}
public TcpServer(String hostNameOrIpAddress, Int32 port) {
RemoteEndPoint = new IPEndPoint(Dns.GetHostEntry(hostNameOrIpAddress).AddressList[0], port);
Host = new Socket(RemoteEndPoint.Address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
}
public TcpServer(Int32 port) {
RemoteEndPoint = new IPEndPoint(Dns.GetHostEntry(Dns.GetHostName()).AddressList[0], port);
Host = new Socket(RemoteEndPoint.Address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
}
#endregion
#region Fields
private Boolean m_IsBound = false;
private List<Socket> m_Connections = new List<Socket>(50); // allow 50 sockets
private static System.Threading.ManualResetEvent AllDone = new System.Threading.ManualResetEvent(false);
#endregion
#region Properties
private Int32 m_Backlog = 32;
/// <summary>
/// Gets or sets the number of connections the host can accept at any given point
/// </summary>
public Int32 Backlog {
set {
m_Backlog = value;
}
get {
return m_Backlog;
}
}
private Socket m_Host = null;
/// <summary>
/// Gets or sets the host master socket
/// </summary>
public Socket Host {
private set {
m_Host = value;
}
get {
return m_Host;
}
}
private Int32 m_Port = 1337;
/// <summary>
/// Gets or sets the binding port for the server
/// </summary>
public Int32 Port {
set {
m_Port = value;
}
get {
return m_Port;
}
}
private IPEndPoint m_EndPoint = null;
/// <summary>
/// Gets or sets the binding address to be used when binding the socket
/// </summary>
public IPEndPoint RemoteEndPoint {
private set {
m_EndPoint = value;
}
get { // follows a singleton pattern with a private-setter.
if (m_EndPoint == null) {
RemoteEndPoint = new IPEndPoint(Dns.GetHostEntry(Dns.GetHostName()).AddressList[0], Port);
}
return m_EndPoint;
}
}
#endregion
#region Methods
private void AcceptCallback(IAsyncResult ar) {
Socket client = ((Socket)ar.AsyncState);
Socket handler = client.EndAccept(ar);
m_Connections.Add(handler);
AllDone.Set();
Console.WriteLine("Client accepted.\t Remote address and port : {0}", handler.RemoteEndPoint.ToString());
Byte[] buf = Encoding.ASCII.GetBytes("hello world. This is my first TCP Server >:)");
Int32 ret = 0;
Boolean ext = false;
//try-catch temporary until sending is figured out. ><
try {
ret = client.Send(buf, buf.Length, SocketFlags.None);
} catch (Exception ex) {
ext = true;
ConsoleColor c = Console.ForegroundColor;
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine(ex.ToString());
Console.ForegroundColor = c;
}
// error check for debugging
if (ret > 0) {
Console.WriteLine("Sent -> {0}", Encoding.ASCII.GetString(buf, 0, buf.Length));
} else {
if (ext) {
ConsoleColor c = Console.ForegroundColor;
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Caught an exception");
Console.ForegroundColor = c;
}
Console.WriteLine("Failed to send welcome packet to client.");
}
State state = new State();
state.WorkSocket = handler;
handler.BeginReceive(state.Buffer, 0, State.BufferSize, 0, new AsyncCallback(ReceiveDataCallback), state);
}
/// <summary>
/// Intialises the socket to listen and begins to accept connections
/// </summary>
/// <returns></returns>
public void Initialise() {
Host.Bind(RemoteEndPoint);
Console.WriteLine("Local address and port : {0}", RemoteEndPoint.ToString());
m_IsBound = true;
Host.Listen(Backlog);
try {
while (true) {
AllDone.Reset();
Console.WriteLine("Awaiting{0} client connection...", (m_Connections.Count > 0 ? " another" : ""));
Host.BeginAccept(new AsyncCallback(AcceptCallback), Host);
AllDone.WaitOne();
Application.DoEvents();
}
} catch (Exception e) {
Log.HandledException(e);
}
}
private void ReceiveDataCallback(IAsyncResult ar) {
State state = ((State)ar.AsyncState);
Socket handler = state.WorkSocket;
if (!handler.IsConnected()) {
return;
}
Int32 read = handler.EndReceive(ar);
if (read > 0) {
state.DataReceived.Append(Encoding.ASCII.GetString(state.Buffer, 0, read));
handler.BeginReceive(state.Buffer, 0, State.BufferSize, SocketFlags.None, new AsyncCallback(ReceiveDataCallback), state);
} else {
if (state.DataReceived.Length > 1) {
String content = state.DataReceived.ToString();
Console.WriteLine("Read {0} bytes from socket.\n Data: {1}", content.Length, content);
}
handler.Close();
}
}
#endregion
}
}
目前，我正在努力让一个简单的版本工作在连接上，客户端从服务器收到一个数据包，上面写着“来自网络的hello world！”。我不断得到一些奇怪的例外。上面的代码只是来自MSDN的直接“复制”（可以这么说）。我在编写时使用了MSDN's example作为指导，并且仍然需要做一些工作（如删除它使用的阻塞性质）。目前，我只想知道如何将数据从主机发送到连接的客户端！ ：（
System.Net.Sockets.SocketException: A request to send or receive data was disall owed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied
at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 size, SocketFlags socketFlags)
at LabAssist.Server.Common.Objects.TcpServer.AcceptCallback(IAsyncResult ar) in F:\Source\ACCL\Lab Suite\Code\LabAssist.Server\Common\Objects\TcpServer.cs:li
ne 119
答案 0 :(得分：2)
我建议使用UDP而不是TCP和手动ACK命令，这样你就不会按照你的老板获得恒定连接的套接字。 UDP Information
我想说的另一点是不使用原始Socket作为第一个TCP连接，使用TCPClient类。 TCPClient