how can I get default gateway?

I tried  some function but them dont work out.

Tell me some  function to do this after your examination!Do give me anything you haven't haven a examination! had better give me full unit and function name to use this unit after your examination!I will give everyone A grade who answer regardless of your answer is correct or not correct!
had better dont  use function of get register value
beacuse my register of gateway is strange   such: HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/{4203270B-BDAF-418B-BF41-2569770580C4}/Parameters/Tcpip/DefaultGateway
So I want such API function to get defaultgateway ,beacuse I want to get default gateway regardless of which way to register.

I have use some function:



function my_ip_address:longint;
const
  bufsize=255;
var
  buf: pointer;
  //str: string;
  RemoteHost : PHostEnt; (* No, don't free it! *)
begin
  buf:=NIL;
  try
    getmem(buf,bufsize);
    winsock.gethostname(buf,bufsize);   (* this one maybe without domain *)
    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^)^);
      //str:= inet_addr(pointer(RemoteHost^.h_addr_list^)^);
  finally
    if buf<>NIL then  freemem(buf,bufsize);
    end;
  result:=winsock.ntohl(result);
  end;  


function LongToIp(Long: Longint): string;
var
  ipx: array[0..3] of Byte;
  i: Byte;
begin
  Longint(ipx) := long;
  Result       := '';
  for i := 0 to 3 do Result := Result + IntToStr(ipx[i]) + '.';
  SetLength(Result, Length(Result) - 1);
end;

but I don't have haven the correct answer from thoese two function

My Default GetWay:192.168.1.1  vpn host
my ip :192.168.1.103  in vpn
The GetWay above 192.168.1.1  :  218.86.198.1
mask:225.225.225.0
first DNS:202.98.192.68
second DNS:192.168.1.11


with the two function run

I got getway as 128.1.1.223  why?
where did 128.1.1.223 come from?

and I ping 128.1.1.223 I cant ping through it.

I can ping through 192.168.1.1  192.168.1.103   218.86.198.1 first DNS:202.98.192.68
second DNS:192.168.1.11