unit1.~pas

本光盘是《Delphi 7应用教程》一书的配套光盘

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Memo1: TMemo;
    Label1: TLabel;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    OpenDialog1: TOpenDialog;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
   var
     F1: TextFile;//定义一个文本文件变量
{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
   OpenDialog1.Execute ;
   edit1.Text :=OpenDialog1.FileName;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  Line:string;
begin
  If length(Edit1.Text)<>0 then //输入了文件名
     begin
         AssignFile(F1,Edit1.Text );
         Reset(F1);
         Memo1.Lines.Clear ;
         while not eof(F1)
            Begin
               readln(F1,line);
               Memo1.Lines.Add(Line);
            end;
     end
     else
        ShowMessage('必须输入文件名');

end;

end.