unity 判斷網絡狀態

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

namespace TestNetConnectWin32
{
    public class GetInternetConStatus
    {
        private const int INTERNET_CONNECTION_MODEM = 1;
        private const int INTERNET_CONNECTION_LAN = 2;
        [DllImport("winInet.dll")]
        private static extern bool InternetGetConnectedState(
        ref int dwFlag,
        int dwReserved
        );

        /// <summary>
        /// 判斷網絡的連接狀態
        /// </summary>
        /// <returns>
        /// 網絡狀態(1-->未聯網;2-->採用調治解調器上網;3-->採用網卡上網)
        ///</returns>
        public static int GetNetConStatus(string strNetAddress)
        {
            int iNetStatus = 0;
            System.Int32 dwFlag = new int();
            if (!InternetGetConnectedState(ref dwFlag, 0))
            {
                //沒有能連上互聯網
                iNetStatus = 1;
            }
            else if ((dwFlag & INTERNET_CONNECTION_MODEM) != 0)
            {
                //採用調治解調器上網,需要進一步判斷能否登錄具體網站
                if (PingNetAddress(strNetAddress))
                {
                    //可以ping通給定的網址,網絡OK
                    iNetStatus = 2;
                }
                else
                {
                    //不可以ping通給定的網址,網絡不OK
                    iNetStatus = 4;
                }
            }

            else if ((dwFlag & INTERNET_CONNECTION_LAN) != 0)
            {
                //採用網卡上網,需要進一步判斷能否登錄具體網站
                if (PingNetAddress(strNetAddress))
                {
                    //可以ping通給定的網址,網絡OK
                    iNetStatus = 3;
                }
                else
                {
                    //不可以ping通給定的網址,網絡不OK
                    iNetStatus = 5;
                }
            }

            return iNetStatus;
        }

        /// <summary>
        /// ping 具體的網址看能否ping通
        /// </summary>
        /// <param name="strNetAdd"></param>
        /// <returns></returns>
        private static bool PingNetAddress(string strNetAdd)
        {
            bool Flage = false;
            Ping ping = new Ping();
            try
            {
                PingReply pr = ping.Send(strNetAdd, 3000);
                if (pr.Status == IPStatus.TimedOut)
                {
                    Flage = false;
                }
                if (pr.Status == IPStatus.Success)
                {
                    Flage = true;
                }
                else
                {
                    Flage = false;
                }
            }
            catch
            {
                Flage = false;
            }
            return Flage;
        }

    }
}
//判斷方法
private void btnJudge_Click(object sender, EventArgs e)
{
    int iNetStatus = GetInternetConStatus.GetNetConStatus("baidu.com");
    if (iNetStatus == 1)
    {
        lblNetStatus.Text = "網絡未連接";
    }
    else if (iNetStatus == 2)
    {
        lblNetStatus.Text = "採用調治解調器上網";
    }
    else if (iNetStatus == 3)
    {
        lblNetStatus.Text = "採用網卡上網";
    }
    else if (iNetStatus == 4)
    {
        lblNetStatus.Text = "採用調治解調器上網,但是聯不通指定網絡";
    }
    else if (iNetStatus == 5)
    {
        lblNetStatus.Text = "採用網卡上網,但是聯不通指定網絡";
    }
}