uses
  WinSock;

function GetLocalIP: String;
const WSVer = $101;
var
  wsaData: TWSAData;
  P: PHostEnt;
  Buf: array [0..127] of Char;
begin
  Result := '';
  if WSAStartup(WSVer, wsaData) = 0 then begin
    if GetHostName(@Buf, 128) = 0 then begin
      P := GetHostByName(@Buf);
      if P <> nil then Result := iNet_ntoa(PInAddr(p^.h_addr_list^)^);
    end;
    WSACleanup;
  end;
end;