uses
  WinSock; // type PHostEnt

function My_IP_Address : longint;
var
  buf : array [0..255] of char;
  RemoteHost : PHostEnt;
begin
  Winsock.GetHostName(@buf, 255);
  RemoteHost:=Winsock.GetHostByName(buf);
  if RemoteHost=NIL then
    My_IP_Address := winsock.htonl($07000001) { 127.0.0.1 }
  else
    My_IP_Address := longint(pointer(RemoteHost^.h_addr_list^)^);
  Result := Winsock.ntohl(Result);
end;