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unit LocalIPs_Unit;

interface

uses
  Windows, Classes, WinSock;

procedure GetLocalIPs(List: TStrings);

implementation

// -----------------------------------------------------------------------------

procedure GetLocalIPs(List: TStrings);
type
  PPInAddr = ^PInAddr;
var
  wsaData: TWSAData;
  HostInfo: PHostEnt;
  HostName: array[0..255] of Char;
  Addr: PPInAddr;
  VersionRequested: Word;
begin
  List.Clear;

  // WinSock Version muss höher als 1.1 sein
  VersionRequested := MakeWord(2, 1);

  if WSAStartup(VersionRequested, wsaData) <> 0 then
    Exit;

  try

    if gethostname(HostName, SizeOf(HostName)) <> 0 then
      Exit;

    HostInfo := gethostbyname(HostName);

    if HostInfo = nil then
      Exit;

    Addr := Pointer(HostInfo^.h_addr_list);

    if (Addr = nil) or (Addr^ = nil) then
      Exit;

    List.Add(inet_ntoa(Addr^^));
    inc(Addr);

    while Addr^ <> nil do
    begin
      List.Add(inet_ntoa(Addr^^));
      inc(Addr);
    end; {end while}

  finally
    WSACleanup;
  end; {end try/finally}
end; {end procedure}

// -----------------------------------------------------------------------------

end.