How to separate data from the string

Question

I am trying to get the list of all the Computers connected on My network and I was able to do so.

But then I need to get the Hostanme of the Ip address which i have stored in the String format with some other data like mac address.

I have tried using json But was not able to get the List of Ip from the String. I just List of ip from the String so that using Foreach I can find the hostname on that specific in.

Here is the code:

  static void Main(String[] args)
  {
        Process arp = new Process();
        arp.StartInfo.UseShellExecute = false;
        arp.StartInfo.RedirectStandardOutput = true;
        arp.StartInfo.FileName = "C://Windows//System32//cmd.exe";
        arp.StartInfo.Arguments = "/c arp -a";
        arp.StartInfo.RedirectStandardOutput = true;
        arp.Start();
        arp.WaitForExit();
        string output = arp.StandardOutput.ReadToEnd();
        Console.WriteLine(output);

        Console.WriteLine(data.Internet_Address);
        Console.ReadLine();            
    }
}

And here is the Output :

Please add input and desired output in text form instead of image. — Adil, Mar 17 '17 at 05:51
Why can't you just get this information directly instead of calling command line tool and parsing its output? — Alexei Levenkov, Mar 17 '17 at 05:57
I was trying to use Json But it Didn't work so (data.internet_Address) was from there My bad Sorry and thanks for pointing out — Yash Karamchandani, Mar 17 '17 at 06:09

score 1 · Accepted Answer · answered Mar 17 '17 at 06:05

1

You can use regex to extract the IPs using Regex.Matches

var matches1 = Regex.Matches(output, @"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b");

As the first IP you may not need you can skip it.

for(int i=1; i < matches1.Count; i++)
     Console.WriteLine("IPs " + i + "\t" + matches1[i].Value);

answered Mar 17 '17 at 06:05

Adil

146,340
25
209
204

Thanks a lot !! Adil it worked I was trying the hard using Json and it never hit me to use the Regex – Yash Karamchandani Mar 17 '17 at 06:29
You are welcome. – Adil Mar 17 '17 at 06:30

score 0 · Answer 2 · answered Mar 17 '17 at 06:08

Generally one would use regular expression to parse such text. Alternatively you can get CSV library to parse similar format, or if this is just one-off case basic String.Split would do.

var byLine = output.Split('\n') // split into lines
   .Skip(1); // skip header
var ips = byLine.Select(s => s.Split(' ')[0]);

Notes:

it is likely better to obtain information you are looking for by direct calls instead of calling command line tool
local addresses generally don't have "hostnames". Windows machine name not necessary visible as DNS entry.

How to separate data from the string

2 Answers2