using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Net;
using System.ComponentModel;

namespace MMPing
{
    public static class myPing
    {
        #region ICMP helper stuff
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        private struct ICMP_OPTIONS
        {
            public Byte Ttl;
            public Byte Tos;
            public Byte Flags;
            public Byte OptionsSize;
            public IntPtr OptionsData;
        };

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        private struct ICMP_ECHO_REPLY
        {
            public int Address;
            public int Status;
            public int RoundTripTime;
            public Int16 DataSize;
            public Int16 Reserved;
            public IntPtr DataPtr;
            public ICMP_OPTIONS Options;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 250)]
            public String Data;
        }

        [DllImport("iphlpapi.dll", SetLastError = true)]
        private static extern IntPtr IcmpCreateFile();
        [DllImport("iphlpapi.dll", SetLastError = true)]
        private static extern bool IcmpCloseHandle(IntPtr handle);
        [DllImport("iphlpapi.dll", SetLastError = true)]
        private static extern Int32 IcmpSendEcho(IntPtr icmpHandle, Int32 destinationAddress, String requestData, Int32 requestSize, ref ICMP_OPTIONS requestOptions, ref ICMP_ECHO_REPLY replyBuffer, Int32 replySize, Int32 timeout);
        #endregion

        public static int Ping(IPAddress IP)
        {
            IntPtr ICMPHandle;
            Int32 iIP;
            String sData;
            ICMP_OPTIONS oICMPOptions = new ICMP_OPTIONS();
            ICMP_ECHO_REPLY ICMPReply = new ICMP_ECHO_REPLY();
            Int32 iReplies;

            ICMPHandle = IcmpCreateFile();
            iIP = BitConverter.ToInt32(IP.GetAddressBytes(), 0);
            sData = "x";
            oICMPOptions.Ttl = 255;

            iReplies = IcmpSendEcho(ICMPHandle, iIP,
                sData, sData.Length, ref oICMPOptions, ref ICMPReply,
                Marshal.SizeOf(ICMPReply), 30);

            IcmpCloseHandle(ICMPHandle);
            return iReplies;
        }
    }
}