uses Winsock;
 
procedure TForm1.FormCreate(Sender: TObject);
var
  wVersionRequested : WORD;
  wsaData : TWSAData;
begin
 {Start up WinSock}
  wVersionRequested := MAKEWORD(1, 1);
  WSAStartup(wVersionRequested, wsaData);
end;
 
procedure TForm1.Button1Click(Sender: TObject);
var
  p : PHostEnt;
  s : array[0..128] of char;
  p2 : pchar;
begin
 {Get the computer name}
  GetHostName(@s, 128);
  p := GetHostByName(@s);
  Memo1.Lines.Add(p^.h_Name);
 {Get the IpAddress}
  p2 := iNet_ntoa(PInAddr(p^.h_addr_list^)^);
  Memo1.Lines.Add(p2);
end;
 
procedure TForm1.FormDestroy(Sender: TObject);
begin
 {Shut down WinSock}
  WSACleanup;
end;