从输出到 richtextbox 的特定端口接收 UDP 数据，同时保留文本 c#

Question

我目前正在进行直接 UDP 连接的聊天。我看到很多关于 TCP 聊天和第三台计算机（服务器）的建议，但我不想要那样。聊天应该只能在本地工作，正如我测试过的那样，在学校、工作场所或其他大地方都很棒。

到目前为止，当我在文本框中点击 Return 时，我已经让它发送 UDP 数据包，但是我发送它的人并没有接缝到程序中。我正在使用 Wireshark 来检查它是否真的发送给了他，确实如此。我已经尝试了几次 google 搜索和测试，但只接缝得到错误，或者没有得到任何程序。

我想要的是一个翻译器，它从特定端口接收 UDP 数据包，并且只显示数据包中的文本数据。我希望它显示在 richTextBox2 上并保留已有的内容。

这是代码和一些屏幕截图：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;

namespace chat
{
  public partial class Form1 : Form
  {



    public Form1()
    {

        InitializeComponent();
        // set this.FormBorderStyle to None here if needed
        // if set to none, make sure you have a way to close the form!
    }


    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);
        if (m.Msg == WM_NCHITTEST)
            m.Result = (IntPtr)(HT_CAPTION);
    }

    private const int WM_NCHITTEST = 0x84;
    private const int HT_CLIENT = 0x1;
    private const int HT_CAPTION = 0x2;

    private void pictureBox1_Click(object sender, EventArgs e)
    {
        colorDialog1.ShowDialog();
        pictureBox1.BackColor = colorDialog1.Color;
        this.BackColor = colorDialog1.Color;

    }

    private void button1_Click(object sender, EventArgs e)
    {

    }

    private void richTextBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            {
                Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram,
    ProtocolType.Udp);

                string IpAddress = textBox3.Text;
                IPAddress serverAddr = IPAddress.Parse(IpAddress);


                IPEndPoint endPoint = new IPEndPoint(serverAddr, 2522);

                string text = textBox4.Text + ": " + richTextBox1.Text;
                byte[] send_buffer = Encoding.ASCII.GetBytes(text);

                sock.SendTo(send_buffer, endPoint);

                richTextBox2.Text = richTextBox2.Text + Environment.NewLine + textBox4.Text + ": " + richTextBox1.Text;

                richTextBox1.Text = "";
            }
        }
    }

    private void timer1_Tick(object sender, EventArgs e)
    {

    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }
  }
}

截图：

computer1 program

computer2 Wireshark -test

我最近从 Visual Basic 跳到了 C#，我对网络的东西有点陌生。如果您愿意提供帮助，非常感谢:)

Answer 1

成功了。

这是目前为止的代码，它有效！

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;
using System.Net.NetworkInformation;

namespace chat
{
  public partial class Form1 : Form

  {



    private const int MyPort = 2522;
    private UdpClient Client;

    public Form1()
    {
        InitializeComponent();

        // Create the UdpClient and start listening.
        Client = new UdpClient(MyPort);
        Client.BeginReceive(DataReceived, null);
    }

    private void DataReceived(IAsyncResult ar)
    {
        IPEndPoint ip = new IPEndPoint(IPAddress.Any, MyPort);
        byte[] data;
        try
        {
            data = Client.EndReceive(ar, ref ip);

            if (data.Length == 0)
                return; // No more to receive
            Client.BeginReceive(DataReceived, null);
        }
        catch (ObjectDisposedException)
        {
            return; // Connection closed
        }

        // Send the data to the UI thread
        this.BeginInvoke((Action<IPEndPoint, string>)DataReceivedUI, ip, Encoding.UTF8.GetString(data));
    }

    private void DataReceivedUI(IPEndPoint endPoint, string data)
    {
        richTextBox2.AppendText(data + Environment.NewLine);
        label4.Text = ("[" + endPoint.ToString() + "]");
        //richTextBox2.AppendText("[" + endPoint.ToString() + "] " + data + Environment.NewLine);
    }



    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);
        if (m.Msg == WM_NCHITTEST)
            m.Result = (IntPtr)(HT_CAPTION);
    }

    private const int WM_NCHITTEST = 0x84;
    private const int HT_CLIENT = 0x1;
    private const int HT_CAPTION = 0x2;

    private void pictureBox1_Click(object sender, EventArgs e)
    {
        colorDialog1.ShowDialog();
        pictureBox1.BackColor = colorDialog1.Color;
        this.BackColor = colorDialog1.Color;

    }

    private void button1_Click(object sender, EventArgs e)
    {

    }



    private void richTextBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            {
                Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

                string IpAddress = textBox3.Text;
                IPAddress serverAddr = IPAddress.Parse(IpAddress);


                IPEndPoint endPoint = new IPEndPoint(serverAddr, 2522);

                string text = textBox4.Text + ": " + richTextBox1.Text;
                byte[] send_buffer = Encoding.ASCII.GetBytes(text);

                sock.SendTo(send_buffer, endPoint);

                richTextBox2.Text = richTextBox2.Text + textBox4.Text + ": " + richTextBox1.Text + Environment.NewLine;

                richTextBox1.Text = "";
            }
        }
    }



    private void Form1_Load(object sender, EventArgs e)
    {
        foreach (var addr in Dns.GetHostEntry(string.Empty).AddressList)
        {
            if (addr.AddressFamily == AddressFamily.InterNetwork)
                label5.Text = "" + addr;
        }
    }

  }
}

如果您正在制作类似的东西，此代码仅适用于本地互联网

从输出到 richtextbox 的特定端口接收 UDP 数据，同时保留文本 c#

Receive UDP data from specific port outputted to richtextbox while keeping text c#

c#

networking

udp

chat

packet-capture