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.NetworkInformation;
using System.Threading;

namespace RicercaHostSubnet
{
    public partial class Form1 : Form
    {
        
        private List<String> lstHost = new List<String>();
        private Thread myThread = null;

        public Form1()
        {
            InitializeComponent();
            Control.CheckForIllegalCrossThreadCalls = false;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            txtIP.Text = "192.168.1"; //Prefisso dell'indirizzo IP deve essere inserito manualmente o crearsi una funzione a parte
        }

       
        private void cmdStart_Click(object sender, EventArgs e)
        {
            myThread = new Thread(() => scan(txtIP.Text));
            myThread.Start();

            if (myThread.IsAlive)
            {
                cmdStop.Enabled = true;
                cmdScan.Enabled = false;
                txtIP.Enabled = false;
            }
        }

        private void cmdStop_Click(object sender, EventArgs e)
        {
            myThread.Suspend();
            cmdScan.Enabled = true;
            cmdStop.Enabled = false;
            txtIP.Enabled = true;
        }


        public void scan(string subnet)
        {
          Ping myPing;
          PingReply reply;
          IPAddress addr;
          IPHostEntry host;
  
          for(int i = 1; i<255; i++)
          {
            string subnetn = "." + i.ToString();
            myPing = new Ping();
            reply = myPing.Send(subnet+subnetn);
    
            if(reply.Status == IPStatus.Success)
            {
              try
              {
                 addr = IPAddress.Parse(subnet + subnetn);
                 host = Dns.GetHostEntry(addr);

                       lstHost.Add(subnet + subnetn + " --> " + host.HostName.ToString()); //Entrambi salvati 192.168.0.200 --> HostName

                       lstIP.Items.Add(subnet+subnetn); //indirizzo IP 
                       lstHostName.Items.Add(host.HostName.ToString()); //NomeHost

              }
              catch
              {
              }
            }
          }
        }

    
        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
                Application.Exit();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            // Display a MsgBox asking the user to save changes or abort.
            if (MessageBox.Show("Do you want close the program?", "Scan Subnetwork",
               MessageBoxButtons.YesNo) == DialogResult.Yes)
            {
                // Cancel the Closing event from closing the form.
                e.Cancel = true;
            }
        }

        //fine class
    }
}