C#端口掃描器的編寫方法
本文實例為大傢分享瞭C#端口掃描器的編寫代碼，供大傢參考，具體內容如下
一、項目設計
新建項目
整體設計
最終設計
二、單線程
1.代碼編寫
button
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace duankou
{
public partial class Form1 : Form
{
private string hostAddress;
//起始端口
private int start;
//終止端口
private int end;
//端口號
private int port;
//定義線程對象
private Thread scanThread;
public Form1()
{
InitializeComponent();
}
private void label1_Click(object sender, EventArgs e)
{
}
private void label2_Click(object sender, EventArgs e)
{
}
private void label4_Click(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
try
{
//初始化
tbShow.Clear();
lb.Text = "0%";
//獲取ip地址和始末端口號
hostAddress = tbHost.Text;
start = Int32.Parse(tbSPort.Text);
end = Int32.Parse(tbEPort.Text);
if (decideAddress()) // 端口合理
{
//讓輸入的textbox隻讀，無法改變
tbHost.ReadOnly = true;
tbSPort.ReadOnly = true;
tbEPort.ReadOnly = true;
//設置進度條的范圍
pb.Minimum = start;
pb.Maximum = end;
//顯示框顯示
tbShow.AppendText("端口掃描器 v1.0.0" + Environment.NewLine + Environment.NewLine);
//調用端口掃描函數
PortScan();
}
else
{
//若端口號不合理，彈窗報錯
MessageBox.Show("輸入錯誤，端口范圍為[0-65536]!");
}
}
catch
{
//若輸入的端口號為非整型，則彈窗報錯
MessageBox.Show("輸入錯誤，端口范圍為[0-65536]!");
}
}
/// <summary>
/// 判斷端口是否合理
/// </summary>
/// <returns></returns>
private bool decideAddress()
{
//判斷端口號是否合理
if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
return true;
else
return false;
}
private void PortScan()
{
double x;
string xian;
//顯示掃描狀態
tbShow.AppendText("開始掃描...（可能需要請您等待幾分鐘）" + Environment.NewLine + Environment.NewLine);
//循環拋出線程掃描端口
for (int i = start; i <= end; i++)
{
x = (double)(i - start + 1) / (end - start + 1);
xian = x.ToString("0%");
port = i;
//調用端口i的掃描操作
Scan();
//進度條值改變
lb.Text = xian;
lb.Refresh();
pb.Value = i;
}
tbShow.AppendText(Environment.NewLine + "掃描結束！" + Environment.NewLine);
//輸入框textbox隻讀屬性取消
tbHost.ReadOnly = false;
tbSPort.ReadOnly = false;
tbEPort.ReadOnly = false;
}
/// <summary>
/// 掃描某個端口
/// </summary>
private void Scan()
{
int portnow = port;
//創建TcpClient對象，TcpClient用於為TCP網絡服務提供客戶端連接
TcpClient objTCP = null;
try
{
//用於TcpClient對象掃描端口
objTCP = new TcpClient(hostAddress, portnow);
//掃描到則顯示到顯示框
tbShow.AppendText("端口 " + port + " 開放！" + Environment.NewLine);
}
catch
{
//未掃描到，則會拋出錯誤
}
}
}
}
2.掃描結果
開始
1分鐘結束 沒有端口開放
三、多線程
1.代碼編寫
button
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace duankou
{
public partial class Form1 : Form
{
private string hostAddress;
//起始端口
private int start;
//終止端口
private int end;
//端口號
private int port;
//定義線程對象
private Thread scanThread;
//定義端口狀態數據（開放則為true，否則為false）
private bool[] done = new bool[65526];
private bool OK;
public Form1()
{
InitializeComponent();
//不進行跨線程檢查
CheckForIllegalCrossThreadCalls = false;
}
private void label1_Click(object sender, EventArgs e)
{
}
private void label2_Click(object sender, EventArgs e)
{
}
private void label4_Click(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
try
{
//初始化
tbShow.Clear();
lb.Text = "0%";
//獲取ip地址和始末端口號
hostAddress = tbHost.Text;
start = Int32.Parse(tbSPort.Text);
end = Int32.Parse(tbEPort.Text);
if (decideAddress()) // 端口合理
{
//讓輸入的textbox隻讀，無法改變
tbHost.ReadOnly = true;
tbSPort.ReadOnly = true;
tbEPort.ReadOnly = true;
//創建線程，並創建ThreadStart委托對象
Thread process = new Thread(new ThreadStart(PortScan));
process.Start();
//設置進度條的范圍
pb.Minimum = start;
pb.Maximum = end;
//顯示框顯示
tbShow.AppendText("端口掃描器 v1.0.0" + Environment.NewLine + Environment.NewLine);
}
else
{
//若端口號不合理，彈窗報錯
MessageBox.Show("輸入錯誤，端口范圍為[0-65536]!");
}
}
catch
{
//若輸入的端口號為非整型，則彈窗報錯
MessageBox.Show("輸入錯誤，端口范圍為[0-65536]!");
}
}
/// <summary>
/// 判斷端口是否合理
/// </summary>
/// <returns></returns>
private bool decideAddress()
{
//判斷端口號是否合理
if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
return true;
else
return false;
}
private void PortScan()
{
double x;
string xian;
//顯示掃描狀態
tbShow.AppendText("開始掃描...（可能需要請您等待幾分鐘）" + Environment.NewLine + Environment.NewLine);
//循環拋出線程掃描端口
for (int i = start; i <= end; i++)
{
x = (double)(i - start + 1) / (end - start + 1);
xian = x.ToString("0%");
port = i;
//使用該端口的掃描線程
scanThread = new Thread(new ThreadStart(Scan));
scanThread.Start();
//使線程睡眠
System.Threading.Thread.Sleep(100);
//進度條值改變
lb.Text = xian;
pb.Value = i;
}
while (!OK)
{
OK = true;
for (int i = start; i <= end; i++)
{
if (!done[i])
{
OK = false;
break;
}
}
System.Threading.Thread.Sleep(1000);
}
tbShow.AppendText(Environment.NewLine + "掃描結束！" + Environment.NewLine);
//輸入框textbox隻讀屬性取消
tbHost.ReadOnly = false;
tbSPort.ReadOnly = false;
tbEPort.ReadOnly = false;
}
/// <summary>
/// 掃描某個端口
/// </summary>
private void Scan()
{
int portnow = port;
//創建線程變量
Thread Threadnow = scanThread;
//掃描端口，成功則寫入信息
done[portnow] = true;
//創建TcpClient對象，TcpClient用於為TCP網絡服務提供客戶端連接
TcpClient objTCP = null;
try
{
//用於TcpClient對象掃描端口
objTCP = new TcpClient(hostAddress, portnow);
//掃描到則顯示到顯示框
tbShow.AppendText("端口 " + port + " 開放！" + Environment.NewLine);
}
catch
{
//未掃描到，則會拋出錯誤
}
}
}
}
2.掃描結果
開始
5秒結束
小結
多線程能夠有更好的CPU使用率，程序設計更簡單，更快的程序響應速度。
鏈接
C#單線程和多線程端口掃描器
以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。