uses WinSpool, Printers;
 
procedure GetPapernames(sl: TStrings);
type
  TPaperName = Array [0..63] of Char;
  TPaperNameArray = Array [1..High(Integer) div Sizeof(TPaperName)] of TPaperName;
  PPapernameArray = ^TPaperNameArray;
var
  Device, Driver, Port: Array [0..255] of Char;
  hDevMode: THandle;
  i, numPaperformats: Integer;
  pPaperFormats: PPapernameArray;
begin
  Printer.GetPrinter(Device, Driver, Port, hDevmode);
  numPaperformats := WinSpool.DeviceCapabilities(Device, Port, DC_PAPERNAMES, Nil, Nil);
  if numPaperformats > 0 then
  begin
    GetMem(pPaperformats, numPaperformats * Sizeof(TPapername));
    try
      WinSpool.DeviceCapabilities(Device, Port, DC_PAPERNAMES, Pchar(pPaperFormats), Nil);
      sl.Clear;
      for i := 1 to numPaperformats do
        sl.add(pPaperformats^[i]);
    finally
      FreeMem(pPaperformats);
    end;
  end;
end;
 
 
procedure TForm1.Button1Click(Sender: TObject);
begin
 GetPapernames(Memo1.Lines);
end;