C# 判断

njyang110 2013-01-17 11:40:56

winform一个程序
运行程序的电脑是双卡网又能上外网又能上内网，
这个程序就是判断内网中另外一台电脑[特定IP地址的电脑]是否开着机，还有就是是否能上外网。
能上外网的标准是，在机房有一台服务器，能连到这个电脑。
同事说用心跳包来检测，我不知道怎么弄，请教大牛怎么写呢？

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liulangdeyuyu 2013-01-25

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简单啊用ping 啊一个是ping 内网的一台机器一个是ping百度

玲cc 2013-01-24

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开一个定时器，隔一段时间去ping你的测试机和服务机。在System.Net.NetworkInformation Namespace里。


public static string PingHost(string host)
{
    //string to hold our return messge
    string returnMessage = string.Empty;

    //IPAddress instance for holding the returned host
    IPAddress address = GetIpFromHost(ref host);

    //set the ping options, TTL 128
    PingOptions pingOptions = new PingOptions(128, true);

    //create a new ping instance
    Ping ping = new Ping();

    //32 byte buffer (create empty)
    byte[] buffer = new byte[32];

    //first make sure we actually have an internet connection
    if (HasConnection())
    {
        //here we will ping the host 4 times (standard)
        for (int i = 0; i < 4; i++)
        {
            try
            {
                //send the ping 4 times to the host and record the returned data.
                //The Send() method expects 4 items:
                //1) The IPAddress we are pinging
                //2) The timeout value
                //3) A buffer (our byte array)
                //4) PingOptions
                PingReply pingReply = ping.Send(address, 1000, buffer, pingOptions);

                //make sure we dont have a null reply
                if (!(pingReply == null))
                {
                    switch (pingReply.Status)
                    {
                        case IPStatus.Success:
                            returnMessage = string.Format("Reply from {0}: bytes={1} time={2}ms TTL={3}", pingReply.Address, pingReply.Buffer.Length, pingReply.RoundtripTime, pingReply.Options.Ttl);
                            break;
                        case IPStatus.TimedOut:
                            returnMessage = "Connection has timed out...";
                            break;
                        default:
                            returnMessage = string.Format("Ping failed: {0}", pingReply.Status.ToString());
                            break;
                    }
                }
                else
                    returnMessage = "Connection failed for an unknown reason...";
            }
            catch (PingException ex)
            {
                returnMessage = string.Format("Connection Error: {0}", ex.Message);
            }
            catch (SocketException ex)
            {
                returnMessage = string.Format("Connection Error: {0}", ex.Message);
            }
        }
    }
    else
        returnMessage = "No Internet connection found...";

    //return the message
    return returnMessage;
}

可参见http://stackoverflow.com/questions/3689728/ping-a-hostname-on-the-network

wanghui0380 2013-01-24

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这个需要在客户机上安装，而且是物理系统就内置公安系统就有这种设备，我曾经抱了一台公安系统的机器到我公司重新装系统，都已经格式化了重装了系统，正在连我公司的网打补丁，结果5分钟不到，公安系统的人就打电话了说：“上面检测到机器非法连接外网”，我当时比较郁闷说我都格式化了你们咋知道，人家告诉我他们有专用硬件滴

njyang110 2013-01-24