using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace Utils.Internet
{
	public class InternetUtil
	{
		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>
		/// 是否联网
		/// </summary>
		public static bool IsConnected()
		{
			System.Int32 dwFlag = new int();
			if (!InternetGetConnectedState(ref dwFlag, 0))
				return false;
			return true;
		}

		/// <summary>
		/// 是否采用猫联网。如果没联网，返回false
		/// </summary>
		public static bool IsConnectedByModem()
		{
			System.Int32 dwFlag = new int();
			if (!InternetGetConnectedState(ref dwFlag, 0))
				return false;
			else if ((dwFlag & INTERNET_CONNECTION_MODEM) != 0)
				return true;
			return false;
		}

		/// <summary>
		/// 是否采用LAN联网。如果没联网，返回false
		/// </summary>
		public static bool IsConnectedByLAN()
		{
			System.Int32 dwFlag = new int();
			if (!InternetGetConnectedState(ref dwFlag, 0))
				return false;
			else if ((dwFlag & INTERNET_CONNECTION_LAN) != 0)
				return true;
			return false;
		}
	}
}