1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | using System.Runtime.InteropServices; private const long INTERNET_CONNECTION_MODEM = 1;//Local system uses a modem to connect to the Internet. private const long INTERNET_CONNECTION_LAN = 2; //Local system uses a local area network to connect to the Internet. private const long INTERNET_CONNECTION_PROXY = 4;//Local system uses a proxy server to connect to the Internet. private const long INTERNET_CONNECTION_MODEM_BUSY = 8; //No longer used. private const long INTERNET_CONNECTION_CONFIGURED = 64; //Local system has a valid connection to the Internet, but it might or might not be currently connected. private const long INTERNET_CONNECTION_OFFLINE = 32; // Local system is in offline mode. private const long INTERNET_RAS_INSTALLED = 16; //Local system has RAS installed. [DllImport("wininet.dll")] public static extern bool InternetGetConnectedState(out long lpdwFlags, long dwReserved); protected void Page_Load(object sender, EventArgs e) { long lfag; string strConnectionDev = ""; if (InternetGetConnectedState(out lfag, 0)) strConnectionDev = "网络连接正常!"; else strConnectionDev = "网络连接不可用!"; if ((lfag & INTERNET_CONNECTION_OFFLINE) > 0) strConnectionDev += "OFFLINE 本地系统处于离线模式。"; if ((lfag & INTERNET_CONNECTION_MODEM) > 0) strConnectionDev += "Modem 本地系统使用调制解调器连接到互联网。"; if ((lfag & INTERNET_CONNECTION_LAN) > 0) strConnectionDev += "LAN 本地系统使用的局域网连接到互联网。"; if ((lfag & INTERNET_CONNECTION_PROXY) > 0) strConnectionDev += "a Proxy"; if ((lfag & INTERNET_CONNECTION_MODEM_BUSY) > 0) strConnectionDev += "Modem but modem is busy"; this.Response.Write(strConnectionDev); } |
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