get ipp address of all pcs connected via lan

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Hello everyone!

I'm Haseeb,

I want to display the IPAddress of all the PC's in a listbox that are connected via LAN.

I have a piece of code but it couldn't display the IPAddress of PC's connected to LAN in my computer lab

C#

hostname = Dns.GetHostName();
            IPHostEntry IPentry = Dns.GetHostEntry(hostname);
            IPAddress[] addr = IPentry.AddressList;
            string addres = addr[0].ToString();
            foreach (IPAddress myip in IPentry.AddressList)
            {
                listBox1.Items.Add(myip.ToString());
            }
            listBox1.Items.Remove(addres);

Please help me in getting the IPAddresses
I'll be highly thankful to you.

Posted 29-Jul-10 20:51pm

haseebsvirgo

Updated 29-Jul-10 22:05pm

Dalek Dave

v2

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Dalek Dave 30-Jul-10 4:05am

Minor Edit for Spelling and Readability

2 solutions

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braim800 · Answer 1 · 2010-07-29T22:02:00

I remeber using windows API method , getting host names which you can resolve to IP addresses. but that will only work for computers in domain I think.
here it is

C#

[DllImport("Netapi32.dll")]
private static extern int NetServerEnum(
    IntPtr     servername,
    uint       level,
    out IntPtr bufptr,
    int        prefmaxlen,
    out int    entriesread,
    out int    totalentries,
    uint       servertype,
    IntPtr     domain,
    IntPtr     resume_handle);

and this code using it

C#

public static string[] EnumComputers()
        {
            IntPtr pInfo;

            int entriesRead = 0;
            int totalEntries = 0;

            int result = NetServerEnum(
                IntPtr.Zero,
                LEVEL_SERVER_INFO_100,
                out pInfo,
                MAX_PREFERRED_LENGTH,
                out entriesRead,
                out totalEntries,
                SV_TYPE_WORKSTATION | SV_TYPE_SERVER,
                IntPtr.Zero,
                IntPtr.Zero);

            if (result != 0)
            {
                throw new ApplicationException("NetApi Error = " + String.Format("0x{0,0:X}", result));
            }

            string[] computers = new string[entriesRead];

            IntPtr pos = pInfo;

            for (int ii = 0; ii < entriesRead; ii++)
            {
                SERVER_INFO_100 info = (SERVER_INFO_100)Marshal.PtrToStructure(pos, typeof(SERVER_INFO_100));

                computers[ii] = info.sv100_name;

                pos = (IntPtr)(pos.ToInt32() + Marshal.SizeOf(typeof(SERVER_INFO_100)));
            }

            NetApiBufferFree(pInfo);

            return computers;
        }

Kim Togo · Answer 2 · 2010-08-05T06:45:00

Solution 2

Try look at IPGlobalProperties class and GetActiveTcpConnections

IPGlobalProperties

This gives you a overview of all active Tcp connection to your own computer.

Posted 5-Aug-10 6:45am

Kim Togo

Updated 5-Aug-10 6:46am

v2