using System.Runtime.InteropServices;
using System.Diagnostics;

        #region 判断网络连接是否连接
        [DllImport("wininet.dll")]
        private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);
        ///

/// 当前网络连接状态
///

        /// 当为true时，网络正常;当为false时，网络断开
        private bool IsConnected()
        {
            int I = 0;
            bool state = InternetGetConnectedState(out I, 0);
            return state;
        }
        #endregion

#region 判断与某服务器是否连接
///

/// 测试与指定服务器是否正常连接
///

        ///
        ///
        private static string CmdPing(string strIp)
        {

Process p = new Process();

p.StartInfo.FileName = "cmd.exe";

p.StartInfo.UseShellExecute = false;

p.StartInfo.RedirectStandardInput = true;

p.StartInfo.RedirectStandardOutput = true;

p.StartInfo.RedirectStandardError = true;

p.StartInfo.CreateNoWindow = true;

string pingrst;

p.Start();

p.StandardInput.WriteLine("ping -n 1 " + strIp);

p.StandardInput.WriteLine("exit");

string strRst = p.StandardOutput.ReadToEnd();

if (strRst.IndexOf("(0% loss)") != -1)

pingrst = "连接";

else if (strRst.IndexOf("Destination host unreachable.") != -1)

pingrst = "无法到达目的主机";

else if (strRst.IndexOf("Request timed out.") != -1)

pingrst = "超时";

else if (strRst.IndexOf("Unknown host") != -1)

pingrst = "无法解析主机";

else

pingrst = strRst;

p.Close();

return pingrst;

}

#endregion

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