unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Buttons;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    ListBox1: TListBox;
    Button4: TButton;
    Button3: TButton;
    Label1: TLabel;
    Label2: TLabel;
    BitBtn1: TBitBtn;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}
var Datei: TextFile;

procedure TForm1.Button1Click(Sender: TObject);
begin
        AssignFile(Datei,'neu.txt');
        Rewrite(Datei);
        if IOResult = 0 then
        begin
        writeln(Datei,'Hallo!');
        writeln(Datei,'Die Datei ist jetzt neu.');
        writeln(Datei,'Sie kann nun verändert werden.');
        CloseFile(Datei);
        end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
        if OpenDialog1.Execute then
        begin
        Memo1.Clear;
        Memo1.Lines.LoadFromFile(OpenDialog1.Filename);
        end;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
        if OpenDialog1.Execute then
        begin
        ListBox1.Clear;
        ListBox1.Items.LoadFromFile(OpenDialog1.Filename);
        end;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
        if SaveDialog1.Execute then
        begin
         Memo1.Lines.SaveToFile(SaveDialog1.Filename);
        end;
end;

end.