C＃发送UDP包

Question

我想知道，他们的任何方式来检查，如果您的程序发送UDP包到期望的IP？我是一个初学者套接字编程器。所以如果你决定帮助我，请解释一些细节。我只有15岁，一直在学习c#只有2个月。

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.Net; 
using System.Net.Sockets; 

namespace Challenger 
{ 
    public partial class Form1 : Form 
    { 
     int ipWidth; 
     String x; 
     String methodValue; 
     int threadNumber; 
     IPEndPoint endPoint; 
     byte[] buffer; 

     public Form1() 
     { 
      InitializeComponent(); 
      urlTextbox.Text ="www."; 
      this.MessageTextBox.Size = new System.Drawing.Size(231, 40); 
      MessageTextBox.Text = "When harpoons, air strikes, and nukes fail."; 
      threadValue(); 
      methodSetter(); 
      ipLabelText(); 
     } 

     private void Form1_Load(object sender, EventArgs e) 
     { 
      this.BackColor = Color.FromArgb(0, 47, 80); //Dark blue background 
     } 

     private void label1_Click(object sender, EventArgs e) 
     { 
     } 

     private void button1_Click(object sender, EventArgs e) 
     { 
      System.Net.IPAddress[] addressess = System.Net.Dns.GetHostAddresses(urlTextbox.Text); 
       String ipTextLength = Convert.ToString(addressess[0]); 
      SendUDPPacket(ipTextLength, 80, "Hello!", 100000000); 
     } 

     private void panel1_Paint(object sender, PaintEventArgs e) 
     { 
      Color pixelColor;//Initialize pixelColor   
      SolidBrush pixelBrush = new SolidBrush(Color.FromArgb(0, 83, 146)); //RGB Brush   
      e.Graphics.FillRectangle(pixelBrush, 0, 0, 500, 400); //Light blue rectangle for displaying IP address 
     } 

     private void urlTextbox_TextChanged(object sender, EventArgs e) 
     { 
     } 

     private void button2_Click(object sender, EventArgs e) 
     {  
       System.Net.IPAddress[] addresses = System.Net.Dns.GetHostAddresses(urlTextbox.Text); 
       String ipTextLength = Convert.ToString(addresses[0]); 
       label2.Text = Convert.ToString(addresses[0]); //Puts ip into a string-> Label for Display 
       label2.Location = new Point(80, 20);      
     } 
     public void ipLabelText() 
     { 
      label2.Parent = panel1; 
      label2.BackColor = Color.Transparent; 
      label2.ForeColor = Color.White;   
     } 

     private void label2_Click(object sender, EventArgs e) 
     { 
     } 

     private void TimeoutLabel_Click(object sender, EventArgs e) 
     { 
     } 

     private void portLabel_Click(object sender, EventArgs e) 
     { 
     } 

     private void textBox3_TextChanged(object sender, EventArgs e) 
     { 
      this.MessageTextBox.Size = new System.Drawing.Size(231, 40); 
     } 

     private void label4_Click(object sender, EventArgs e) 
     { 
     } 

     private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) 
     { 
     } 

     private void methodClick(object sender, MouseEventArgs e) 
     { 
     } 
     public void methodSetter() 
     { 
      comboBox1.SelectedIndex = 0; 
      if (comboBox1.SelectedIndex == 0) 
      { 
       methodValue = "TCP"; 
      } 
      if (comboBox1.SelectedIndex == 1) 
      { 
       methodValue = "UDP"; 
      } 
      if (comboBox1.SelectedIndex == 2) 
      { 
       methodValue = "HTTP"; 
      } 
     } 

     private void textBox3_TextChanged_1(object sender, EventArgs e) 
     { 
     } 

     public void threadValue() 
     { 
      textBox3.Text = "10";//Default thread value 
      threadNumber = Convert.ToInt32(threadNumber); 
     } 

     private void ipLockOn_Click(object sender, EventArgs e) 
     { 
      IPHostEntry hostEntry; 
      hostEntry = Dns.GetHostEntry(ip1.Text+"."+ip2.Text+"."+ip3.Text+"."+ip4.Text); 
      String x = Convert.ToString(hostEntry.AddressList); 

      label2.Text = x; //Puts ip into a string-> Label for Display  

      label2.Location = new Point(80, 20);  
     } 
     public void SendUDPPacket(string hostNameOrAddress, int destinationPort, string data, int count) 
     { 
      // Validate the destination port number 
      if (destinationPort < 1 || destinationPort > 65535) 
       throw new ArgumentOutOfRangeException("destinationPort", "Parameter destinationPort must be between 1 and 65,535."); 

      // Resolve the host name to an IP Address 
      IPAddress[] ipAddresses = Dns.GetHostAddresses(urlTextbox.Text); 
      if (ipAddresses.Length == 0) 
       throw new ArgumentException("Host name or address could not be resolved.", "hostNameOrAddress"); 

      // Use the first IP Address in the list 
      IPAddress destination = ipAddresses[0]; 
      IPEndPoint endPoint = new IPEndPoint(destination, destinationPort); 
      byte[] buffer = Encoding.ASCII.GetBytes(data); 

      // Send the packets 
      Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);   
      while (true) 
      { 
       socket.SendTo(buffer, endPoint); 
      } 
     } 
    } 
} 

• 在C＃

Answer 1

https://www.wireshark.org/移植LOIC Android应用程序 - 这是网络调试有史以来最好的工具。您可以通过UDP &端口进行过滤，并且它会给您详细分析所有数据包&标头，包括源&目标IP。