以下函式可以用來選擇紙張尺寸及列印方向：


{DMPAPER_LEGAL, DMPAPER_LETTER, DMPAPER_A3;
DMPAPER_A4, DMPAPER_A5, DMPAPER_LETTER}

{DMORIENT_LANDSCAPE, DMORIENT_PORTRAIT}

procedure SetPaper(Printer: TPrinter; Paper, Orient: smallint );
var
{$IFDEF Win32}
   FDevMode: PDeviceModeA;
{$ELSE}
   FDevMode: PDevMode;
{$ENDIF}
   FDevice, FDriver, FPort : Array[0..255] of Char;
   FHandle : THandle;
begin
  Printer.GetPrinter (FDevice, FDriver, FPort, FHandle );
  Printer.SetPrinter (FDevice, FDriver, FPort, FHandle );
  if FHandle = 0 then
  begin
    Printer.PrinterIndex := Printer.PrinterIndex;
    Printer.GetPrinter (FDevice, FDriver, FPort, FHandle );
  end;
  if FHandle = 0 then 
    Exit;

  CurrPaperSize:= Paper;
  CurrPaperOrient:= Orient;  // this is where the orientation gets set
{$IFDEF WIN32}
  FDevMode:= GlobalLock(FHandle);
{$ELSE}
  FDevMode:= Ptr(FHandle, 0);
{$ENDIF}
  with FDevMode^ do
  begin
    dmPaperSize:= Paper;
    dmOrientation:= Orient;
    dmFields:= dmFields or DM_PAPERSIZE or DM_ORIENTATION or DM_COPIES;
  end;
{$IFDEF WIN32}
  if FHandle <> 0 then 
    GlobalUnLock(FHandle);
{$ENDIF}
end;

Good luck,
Jeff Rafter
Realsoft Development

    Source: geocities.com/huanlin_tsai/faq

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