delphi 获取mac地址

function TActiveFormX.GetMACAdress: string; //uses NB30;
var
  NCB: PNCB;
  Adapter: PAdapterStatus;
  URetCode: PChar;
  RetCode: char;
  I: integer;
  Lenum: PlanaEnum;
  _SystemID: string;
  TMPSTR: string;
begin
  Result := '';
  _SystemID := '';
  Getmem(NCB, SizeOf(TNCB));
  Fillchar(NCB^, SizeOf(TNCB), 0);

  Getmem(Lenum, SizeOf(TLanaEnum));
  Fillchar(Lenum^, SizeOf(TLanaEnum), 0);

  Getmem(Adapter, SizeOf(TAdapterStatus));
  Fillchar(Adapter^, SizeOf(TAdapterStatus), 0);

  Lenum.Length := chr(0);
  NCB.ncb_command := chr(NCBENUM); 
  NCB.ncb_buffer := Pointer(Lenum);
  NCB.ncb_length := SizeOf(Lenum); 
  RetCode := Netbios(NCB);

  i := 0;
  repeat 
    Fillchar(NCB^, SizeOf(TNCB), 0);
    Ncb.ncb_command := chr(NCBRESET);
    Ncb.ncb_lana_num := lenum.lana[I];
    RetCode := Netbios(Ncb);

    Fillchar(NCB^, SizeOf(TNCB), 0);
    Ncb.ncb_command := chr(NCBASTAT);
    Ncb.ncb_lana_num := lenum.lana[I];
    // Must be 16
    Ncb.ncb_callname := ('*');

    Ncb.ncb_buffer := Pointer(Adapter);

    Ncb.ncb_length := SizeOf(TAdapterStatus);
    RetCode := Netbios(Ncb);
    //---- calc _systemId from mac-address[2-5] XOR mac-address[1]...
    if (RetCode = chr(0)) or (RetCode = chr(6)) then
    begin
      _SystemId := IntToHex(Ord(Adapter.adapter_address[0]), 2) + '-' +
      IntToHex(Ord(Adapter.adapter_address[1]), 2) + '-' +
      IntToHex(Ord(Adapter.adapter_address[2]), 2) + '-' +
      IntToHex(Ord(Adapter.adapter_address[3]), 2) + '-' +
      IntToHex(Ord(Adapter.adapter_address[4]), 2) + '-' +
      IntToHex(Ord(Adapter.adapter_address[5]), 2);
    end;
      Inc(i);
  until (I >= Ord(Lenum.Length)) or (_SystemID <> '00-00-00-00-00-00');
  FreeMem(NCB);
  FreeMem(Adapter);
  FreeMem(Lenum);
  GetMacAdress := _SystemID;
end;