uses Printers;

{$IFNDEF WIN32}
const MAX_PATH = 144;
{$ENDIF}

procedure TForm1.Button1Click(Sender: TObject);
var
  pDevice : pChar;
  pDriver : pChar;
  pPort   : pChar;
  hDMode : THandle;
begin
  if PrintDialog1.Execute then begin
    GetMem(pDevice, cchDeviceName);
    GetMem(pDriver, MAX_PATH);
    GetMem(pPort, MAX_PATH);
    Printer.GetPrinter(pDevice, pDriver, pPort, hDMode);
    if lStrLen(pDriver) = 0 then begin
      GetProfileString(''''Devices'''', pDevice, '''''''', pDriver, MAX_PATH);
      pDriver[pos('''','''', pDriver) - 1] := #0;
    end;
    if lStrLen(pPort) = 0 then begin
      GetProfileString(''''Devices'''', pDevice, '''''''', pPort, MAX_PATH);
      lStrCpy(pPort,  @pPort[lStrLen(pPort)+2]);
    end;
    Memo1.Lines.Add(''''Device := '''' + StrPas(pDevice));
    Memo1.Lines.Add(''''Driver := '''' + StrPas(pDriver));
    Memo1.Lines.Add(''''Port := '''' + StrPas(pPort));
    FreeMem(pDevice, cchDeviceName);
    FreeMem(pDriver, MAX_PATH);
    FreeMem(pPort, MAX_PATH);
  end;
end;