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All netowrk interfaces list (ip and subnetmask)

Posted on 2003-11-17
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Last Modified: 2010-04-05
Hi.
I want to obtain a list of ALL available network interfaces on a system. I want a list of ip-subnetmask pairs, one pair for each subnet the computer is on. The computer may have more than one network cards, or the network card may have more ips assigned to it, or I may have a netorkcard and an active dial-up connection, etc. Basicaly, I want to see all the interfaces, just like you do when you run the "ifconfig" command on a Unix system. I only need the ip and subnetmask for each. I hope you got it :)

I've done some digging in the registry and I kinda found there what I am looking for, but the information there is rather inconsistent (dial-up info is in once place, network card info in another place, etc.)
I need a consistent solution for listing all netowrk interfaces that will work on all (most) windows versions (95, 98, ME, XP, 2k, etc.)

Also, it would be nice to be notifyed when any of these change (under win XP, if the user changes the ip, I want to be notifyed, or if the user connects/disconnects trough dial-up). This part is not very important cos I can always check manualy from time to time.
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Question by:Muqker
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gmayo earned 1200 total points
ID: 9769638
There is a previous question:
http://oldlook.experts-exchange.com/Programming/Programming_Languages/Delphi/Q_20352829.html?query=list+all+network+cards&searchType=topic

I do have another solution but I need to find it first... watch this space if nobody else gets here first!

Geoff M.
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by:gmayo
ID: 9769664
procedure GetIPs(s : TStrings);
type
      TaPInAddr = Array[0..10] of PInAddr;
      PaPInAddr = ^TaPInAddr;
var
      phe : PHostEnt;
      pptr : PaPInAddr;
      Buffer : Array[0..63] of Char;
      i : Integer;
      GInitData : TWSAData;
begin
      WSAStartup($101, GInitData);
      s.Clear;
      GetHostName(Buffer, SizeOf(Buffer));
      phe := GetHostByName(buffer);
      if phe <> nil then begin
            pPtr := PaPInAddr(phe^.h_addr_list);
            I := 0;
            while pPtr^[I] <> nil do
            begin
                  s.Add(inet_ntoa(pptr^[I]^));
                  Inc(I);
            end;
            WSACleanup;
      end;
end;

That will get all the IP addresses (my PC has 2: one for the ethernet card; one for the USB broadband modem). There is a much longer example on http://oldlook.experts-exchange.com/Programming/Programming_Languages/Delphi/Q_10126142.html which gets the subnet mask as well.

Geoff M.
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by:gmayo
ID: 10086771
Any good?
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