c# - tcpClient 和 IRC 客户端问题

Question

有人能告诉我为什么下面的代码不起作用吗？

using System;
using System.IO;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace TCPClient {
    public partial class Form1 : Form {

        private TcpClient client;
        private Thread readThread;
        private NetworkStream stream;
        private Stream dataStream;
        private Encoding dataStreamEncoding;
        private StreamWriter writer;
        private StreamReader reader;

        public Form1() {
            InitializeComponent();

            this.client = new TcpClient();
            this.readThread = new Thread(ReadLoop);
            this.dataStreamEncoding = Encoding.Default;

            Thread.CurrentThread.Name = "MainThread";
            this.readThread.Name = "ReadThread";
        }

        private void btnConnect_Click(object sender, EventArgs e) {
            if (this.client != null && !this.client.Connected) {


                try {
                    this.client.Connect("open.ircnet.net", 6666);

                    if (this.client != null && this.client.Connected) {
                        Console.WriteLine("Connected");
                    }

                    // Set up network I/O objects.
                    this.stream = this.client.GetStream();
                    this.writer = new StreamWriter(this.stream, this.dataStreamEncoding);
                    this.reader = new StreamReader(this.stream, this.dataStreamEncoding);

                    //HandleClientConnected(state.Item3);
                    this.readThread.Start();
                } catch (Exception ex) {
                    Console.WriteLine(ex.Message);
                }
            }
        }

        private void btnPing_Click(object sender, EventArgs e) {
            Console.WriteLine("Ping Sent");
            this.writer.Write("PING");
            this.writer.Flush();
        }

        private void btnLogin_Click(object sender, EventArgs e) {
            Console.WriteLine("Login Info Sent");
            this.writer.Write(  "PASS *\r\n" + 
                                "NICK testing3134\r\n" + 
                                "USER guest 8 * :\"John Doe\"");
            this.writer.Flush();
        }

        private void ReadLoop() {
            try {
                // Read each message from network stream, one per line, until client is disconnected.
                while (this.client != null && this.client.Connected) {
                    var line = this.reader.ReadLine();
                    if (line == null)
                        break;

                    Console.WriteLine(line);
                }

                if(!this.client.Connected) {
                    Console.WriteLine("Disconnected");
                }
            } catch(Exception ex) {
                Console.WriteLine(ex.Message);
            }
        }
    }
}

控制台:

Connected
:ircnet.eversible.com 020 * :Please wait while we process your connection to ircnet.eversible.com
Login Info Sent
Ping Sent
The thread 'ReadThread' (0x10bc) has exited with code 0 (0x0).
ERROR :Closing Link: testing3134[unknown@24.255.34.216] (Ping timeout)

使它起作用的变化:

原文:

    private void btnPing_Click(object sender, EventArgs e) {
        Console.WriteLine("Ping Sent");
        this.writer.Write("PING");
        this.writer.Flush();
    }

    private void btnLogin_Click(object sender, EventArgs e) {
        Console.WriteLine("Login Info Sent");
        this.writer.Write(  "PASS *\r\n" + 
                            "NICK testing3134\r\n" + 
                            "USER guest 8 * :\"John Doe\"");
        this.writer.Flush();
    }

工作:

    private void btnPing_Click(object sender, EventArgs e) {
        Console.WriteLine("Ping Sent");
        this.writer.WriteLine("PING\r\n");
        this.writer.Flush();
    }

    private void btnLogin_Click(object sender, EventArgs e) {
        Console.WriteLine("Login Info Sent");
        this.writer.WriteLine("PASS *\r\n");
        this.writer.Flush();
        this.writer.WriteLine("NICK testing3134\r\n");
        this.writer.Flush();
        this.writer.WriteLine("USER guest 8 * :\"John Doe\"\r\n");
        this.writer.Flush();
    }

我不仅从 Write 切换到 WriteLine，而且就像接受的答案建议的那样，我在所有发送的请求的末尾添加了换行符。

Answer 1

您没有在 PING 或 USER 消息后包含换行符。

来自 RFC 2812 :

IRC messages are always lines of characters terminated with a CR-LF (Carriage Return - Line Feed) pair

所以你应该:

this.writer.Write("PASS *\r\n" + 
                  "NICK testing3134\r\n" + 
                  "USER guest 8 * :\"John Doe\"\r\n");

和:

this.writer.Write("PING\r\n");

如果我是你，我也会避免使用 Encoding.Default。 RFC 指定不使用特定的字符编码，但它确实期望它是 8 位编码(而不是潜在的多字节编码)。这是指定编码的糟糕方式，但我可能会明确使用 ASCII 或 ISO-8859-1。