連接到服務器時的SocketException

Question

我在同一台計算機上同時運行客戶端和服務器。 有1個人知道上述錯誤嗎？

服務器

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Net.Sockets;
using System.IO;
using System.Net;
namespace Server
{
    public partial class Server : Form
    {
        private Socket connection;
        private Thread readThread;

        private NetworkStream socketStream;
        private BinaryWriter writer;
        private BinaryReader reader;

        //default constructor

        public Server()
        {
            InitializeComponent();

            //create a new thread from server
            readThread = new Thread(new ThreadStart(RunServer));
            readThread.Start();
        }

        protected void Server_Closing(object sender, CancelEventArgs e)
        {
            System.Environment.Exit(System.Environment.ExitCode);
        }

        //sends the text typed at the server to the client
        protected void inputText_KeyDown(object sender, KeyEventArgs e)
        {
            // send the text to client
            try
            {
                if (e.KeyCode == Keys.Enter && connection != null)
                {
                    writer.Write("Server>>> " + inputText.Text);

                    displayText.Text +=
                        "\r\nSERVER>>> " + inputText.Text;

                    //if user at server enter terminate
                    //disconnect the connection to the client
                    if (inputText.Text == "TERMINATE")
                        connection.Close();

                    inputText.Clear();
                }
            }
            catch (SocketException)
            {
                displayText.Text += "\nError writing object";
            }
        }//inputTextBox_KeyDown

        // allow client to connect & display the text it sends
        public void RunServer()
        {
            TcpListener listener;

            int counter = 1;

            //wait for a client connection & display the text client sends
            try
            {
                //step 1: create TcpListener
                IPAddress ipAddress = Dns.Resolve("localhost").AddressList[0];
                TcpListener tcplistener = new TcpListener(ipAddress, 9000);

                //step 2: TcpListener waits for connection request
                tcplistener.Start();

                //step 3: establish connection upon client request
                while (true)
                {
                    displayText.Text = "waiting for connection\r\n";

                    // accept incoming connection
                    connection = tcplistener.AcceptSocket();

                    //create NetworkStream object associated with socket
                    socketStream = new NetworkStream(connection);

                    //create objects for transferring data across stream
                    writer = new BinaryWriter(socketStream);
                    reader = new BinaryReader(socketStream);

                    displayText.Text += "Connection " + counter + " received.\r\n ";

                    //inform client connection was successful
                    writer.Write("SERVER>>> Connection successful");
                    inputText.ReadOnly = false;
                    string theReply = "";

                    // step 4: read string data sent from client
                    do
                    {
                        try
                        {
                            //read the string sent to the server
                            theReply = reader.ReadString();

                            // display the message
                            displayText.Text += "\r\n" + theReply;
                        }

                    // handle the exception if error reading data
                        catch (Exception)
                        {
                            break;
                        }

                    } while (theReply != "CLIENT>>> TERMINATE" && connection.Connected);

                    displayText.Text +=
                        "\r\nUser terminated connection";

                    // step 5: close connection
                    inputText.ReadOnly = true;
                    writer.Close();
                    reader.Close();
                    socketStream.Close();
                    connection.Close();

                    ++counter;
                }
            } //end try

            catch (Exception error)
            {
                MessageBox.Show(error.ToString());
            }
        }
    }// end method runserver
}// end class server

客戶

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Net.Sockets;
using System.IO;
using System.Net;
namespace Client
{
    public partial class Client : Form
    {
        private NetworkStream output;
        private BinaryWriter writer;
        private BinaryReader reader;

        private string message = "";
        private Thread readThread;

        //default constructor
        public Client()
        {
            InitializeComponent();

            readThread = new Thread(new ThreadStart(RunClient));
            readThread.Start();
        }

        protected void Client_Closing(
            object sender, CancelEventArgs e)
        {
            System.Environment.Exit(System.Environment.ExitCode);
        }

        //sends the text user typed to server
        protected void inputText_KeyDown(
            object sender, KeyEventArgs e)
        {
            try
            {
                if (e.KeyCode == Keys.Enter)
                {
                    writer.Write("CLIENT>>> " + inputText.Text);

                    displayText.Text +=
                        "\r\nCLIENT>>> " + inputText.Text;

                    inputText.Clear();
                }
            }
            catch (SocketException ioe)
            {
                displayText.Text += "\nError writing object";
            }
        }//end method inputText_KeyDown

        //connect to server & display server-generated text
        public void RunClient()
        {
            TcpClient client;

            //instantiate TcpClient for sending data to server
            try
            {
                displayText.Text += "Attempting connection\r\n";

                //step1: create TcpClient for sending data to server

                client = new TcpClient();
                client.Connect("localhost", 9000);

                //step2: get NetworkStream associated with TcpClient
                output = client.GetStream();

                //create objects for writing & reading across stream
                writer = new BinaryWriter(output);
                reader = new BinaryReader(output);

                displayText.Text += "\r\nGot I/O streams\r\n";

                inputText.ReadOnly = false;

                //loop until server terminate
                do
                {
                    //step3: processing phase
                    try
                    {
                        //read from server
                        message = reader.ReadString();
                        displayText.Text += "\r\n" + message;
                    }

                    //handle exception if error in reading server data
                    catch (Exception)
                    {
                        System.Environment.Exit(System.Environment.ExitCode);
                    }
                } while (message != "SERVER>>> TERMINATE");

                displayText.Text += "\r\nClosing connection.\r\n";

                //step4: close connection
                writer.Close();
                reader.Close();
                output.Close();
                client.Close();
                Application.Exit();
            }
            catch (Exception error)
            {
                MessageBox.Show(error.ToString());
            }
        }
    }
}

Answer 1

這可能是您的防火牆正在起作用。 嘗試連接到TCP 80上的www.google.com之類的東西，以查看是否可以實際連接。

Answer 2

您是否正在使用Windows的較新版本？ 您可能只在偵聽IPv4，但“本地主機”正在解析為IPv6地址，但找不到它。 嘗試連接到“ 127.0.0.1”而不是localhost，然后查看結果是否更改。

Answer 3

mk，我將tcplistener / tcpclient用於簡單的應用程序。 。 。 翡翠變色龍

Answer 4

如果您將該構造函數與TCPListener一起使用，則它將使基礎服務提供商選擇一個網絡地址，該地址可能不是“ localhost”。 您可能正在偵聽LAN / WLAN卡而不是本地主機。

看一下TCPListener的MSDN頁面，那里的示例展示了如何使用其他構造函數，其他示例則查看其他構造函數。

這是一種方法：

IPAddress ipAddress = Dns.Resolve("localhost").AddressList[0];
TcpListener tcpListener =  new TcpListener(ipAddress, 9000);