...Show the print dialog and print text files?

unit Unit1;

interface

uses
  {...,}ComCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    PrintDialog1: TPrintDialog;
    RichEdit1: TRichEdit;
    procedure Button1Click(Sender: TObject);
   {...}
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
  if PrintDialog1.Execute then
    Richedit1.Print('Ltp1'); {Ltp1, Lpt2 are printers}
end;

end.