Connaitre Adresse MAC

function GetMACAdress: string;
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;

type
  TAdapterStatus = record
    adapter_address: array [0..5] of char;
    filler: array [1..4 * SizeOf(char) + 19 * SizeOf(Word) + 3 * SizeOf(DWORD)] of
    Byte;
  end;

  THostInfo = record
    username: PWideChar;
    logon_domain: PWideChar;
    oth_domains: PWideChar;
    logon_server: PWideChar;
  end;{record}


function IsNetConnect: Boolean;
begin
  if GetSystemMetrics(SM_NETWORK) and $01 = $01 then Result := True
  else
    Result := False;
end;{function}

function AdapterToString(Adapter: TAdapterStatus): string;
begin
  with Adapter do Result :=
      Format('%2.2x-%2.2x-%2.2x-%2.2x-%2.2x-%2.2x',
      [Integer(adapter_address[0]), Integer(adapter_address[1]),
      Integer(adapter_address[2]), Integer(adapter_address[3]),
      Integer(adapter_address[4]), Integer(adapter_address[5])]);
end;{function}

function GetMacAddresses(const Machine: string;
  const Addresses: TStrings): Integer;
const
  NCBNAMSZ = 16;        // absolute length of a net name
  MAX_LANA = 254;       // lana's in range 0 to MAX_LANA inclusive
  NRC_GOODRET = $00;       // good return
  NCBASTAT = $33;       // NCB ADAPTER STATUS
  NCBRESET = $32;       // NCB RESET
  NCBENUM = $37;       // NCB ENUMERATE LANA NUMBERS
type
  PNCB = ^TNCB;
  TNCBPostProc = procedure(P: PNCB);
  stdcall;
  TNCB = record
    ncb_command: Byte;
    ncb_retcode: Byte;
    ncb_lsn: Byte;
    ncb_num: Byte;
    ncb_buffer: PChar;
    ncb_length: Word;
    ncb_callname: array [0..NCBNAMSZ - 1] of char;
    ncb_name: array [0..NCBNAMSZ - 1] of char;
    ncb_rto: Byte;
    ncb_sto: Byte;
    ncb_post: TNCBPostProc;
    ncb_lana_num: Byte;
    ncb_cmd_cplt: Byte;
    ncb_reserve: array [0..9] of char;
    ncb_event: THandle;
  end;
  PLanaEnum = ^TLanaEnum;
  TLanaEnum = record
    Length: Byte;
    lana: array [0..MAX_LANA] of Byte;
  end;
  ASTAT = record
    adapt: TAdapterStatus;
    namebuf: array [0..29] of TNameBuffer;
  end;
var
  NCB: TNCB;
  Enum: TLanaEnum;
  I: integer;
  Adapter: ASTAT;
  MachineName: string;
begin
  Result := -1;
  Addresses.Clear;
  MachineName := UpperCase(Machine);
  if MachineName = '' then    MachineName := '*';
  FillChar(NCB, SizeOf(NCB), #0);
  NCB.ncb_command := NCBENUM;
  NCB.ncb_buffer  := Pointer(@Enum);
  NCB.ncb_length  := SizeOf(Enum);
  if Word(NetBios(@NCB)) = NRC_GOODRET then
  begin
    Result := Enum.Length;
    for I := 0 to Ord(Enum.Length) - 1 do
    begin
      FillChar(NCB, SizeOf(TNCB), #0);
      NCB.ncb_command  := NCBRESET;
      NCB.ncb_lana_num := Enum.lana[I];
      if Word(NetBios(@NCB)) = NRC_GOODRET then
      begin
        FillChar(NCB, SizeOf(TNCB), #0);
        NCB.ncb_command  := NCBASTAT;
        NCB.ncb_lana_num := Enum.lana[i];
        StrLCopy(NCB.ncb_callname, PChar(MachineName), NCBNAMSZ);
        StrPCopy(@NCB.ncb_callname[Length(MachineName)],
          StringOfChar(' ', NCBNAMSZ - Length(MachineName)));
        NCB.ncb_buffer := PChar(@Adapter);
        NCB.ncb_length := SizeOf(Adapter);
        if Word(NetBios(@NCB)) = NRC_GOODRET then
          Addresses.Add(AdapterToString(Adapter.adapt));
      end;
    end;
  end;
end;

procedure TForm6.Button1Click(Sender: TObject);
begin
label1.Caption := GetMacAddresses;
end;