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uses ..., Printers;

TForm1.Button1Click(Sender: TObject);
var
Line: Integer;
PrintText: TextFile; 
begin
if PrintDialog1.Execute then
begin
AssignPrn(PrintText);
Rewrite(PrintText); 
Printer.Canvas.Font := Memo1.Font;
for Line := 0 to Memo1.Lines.Count - 1 do
Writeln(PrintText, Memo1.Lines[Line]); 
CloseFile(PrintText); 
end;