使用InternetGetConnectedState判断本地网络状态(C#举例)
函数原型:函数InternetGetConnectedState返回本地系统的网络连接状态。
语法:
值
|
含义
|
---|---|
INTERNET_CONNECTION_CONFIGURED
0x40(64)
|
Local system has a valid connection to the Internet, but it might or might not be currently connected.
|
INTERNET_CONNECTION_LAN
0x02(2)
|
Local system uses a local area network to connect to the Internet.
|
INTERNET_CONNECTION_MODEM0
x01(1)
|
Local system uses a modem to connect to the Internet.
|
INTERNET_CONNECTION_MODEM_BUSY0
x08(8)
|
No longer used.
|
INTERNET_CONNECTION_OFFLINE
0x20(16)
|
Local system is in offline mode.
|
INTERNET_CONNECTION_PROXY
0x04(4)
|
Local system uses a proxy server to connect to the Internet.
|
INTERNET_RAS_INSTALLED
0x10(8)
|
Local system has RAS installed.
|
运行效果:
代码:
using System; using System.Collections.Generic; using System.Text; using System.Net.NetworkInformation; namespace ConsoleApplication1 { class Program { public static void Main(string[] args) { string url = "www.baidu.com;www.sina.com;www.cnblogs.com;www.google.com;www.163.com;www.csdn.com"; string[] urls = url.Split(new char[] { ‘;‘ }); CheckServeStatus(urls); Console.ReadKey(); } /// <summary> /// 检测网络连接状态 /// </summary> /// <param name="urls"></param> public static void CheckServeStatus(string[] urls) { int errCount = 0;//ping时连接失败个数 if (!LocalConnectionStatus()) { Console.WriteLine("网络异常~无连接"); } else if (!MyPing(urls, out errCount)) { if ((double)errCount / urls.Length >= 0.3) { Console.WriteLine("网络异常~连接多次无响应"); } else { Console.WriteLine("网络不稳定"); } } else { Console.WriteLine("网络正常"); } } #region 网络检测 private const int INTERNET_CONNECTION_MODEM = 1; private const int INTERNET_CONNECTION_LAN = 2; [System.Runtime.InteropServices.DllImport("winInet.dll")] private static extern bool InternetGetConnectedState(ref int dwFlag, int dwReserved); /// <summary> /// 判断本地的连接状态 /// </summary> /// <returns></returns> private static bool LocalConnectionStatus() { System.Int32 dwFlag = new Int32(); if (!InternetGetConnectedState(ref dwFlag, 0)) { Console.WriteLine("LocalConnectionStatus--未连网!"); return false; } else { if ((dwFlag & INTERNET_CONNECTION_MODEM) != 0) { Console.WriteLine("LocalConnectionStatus--采用调制解调器上网。"); return true; } else if ((dwFlag & INTERNET_CONNECTION_LAN) != 0) { Console.WriteLine("LocalConnectionStatus--采用网卡上网。"); return true; } } return false; } /// <summary> /// Ping命令检测网络是否畅通 /// </summary> /// <param name="urls">URL数据</param> /// <param name="errorCount">ping时连接失败个数</param> /// <returns></returns> public static bool MyPing(string[] urls, out int errorCount) { bool isconn = true; Ping ping = new Ping(); errorCount = 0; try { PingReply pr; for (int i = 0; i < urls.Length; i++) { pr = ping.Send(urls[i]); if (pr.Status != IPStatus.Success) { isconn = false; errorCount++; } Console.WriteLine("Ping " + urls[i] + " " + pr.Status.ToString()); } } catch { isconn = false; errorCount = urls.Length; } //if (errorCount > 0 && errorCount < 3) // isconn = true; return isconn; } #endregion } }
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