unit1.pas

来自「精彩编程百例26～50 其中有 控制任务栏 windows底层任务控制 屏保预览」· PAS 代码 · 共 77 行

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    DriveComboBox1: TDriveComboBox;
    DirectoryListBox1: TDirectoryListBox;
    FileListBox1: TFileListBox;
    Label2: TLabel;
    Memo1: TMemo;
    Label3: TLabel;
    Button2: TButton;
    Button3: TButton;
    Label1: TLabel;
    txtEdit: TEdit;
    procedure Button3Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);

  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button3Click(Sender: TObject);
begin
    form1.Close;
end;
procedure TForm1.Button1Click(Sender: TObject);

Begin
   memo1.Lines.savetofile(filelistbox1.filename);   //将文本修改并覆盖到原文件上
   messagedlg('存档成功',mtInformation,[mbOK],0);   //显示完成信息
   memo1.lines.Clear;   //清除memo控件中的显示信息
   txtedit.text:='';
end;


procedure TForm1.Button2Click(Sender: TObject);
var
f: file of Byte;
size: Longint; S: String;
begin
   if(filelistbox1.filename='' )then
   messagedlg('请选择一个文本文件',mtInformation,[mbOK],0)  //确定文件是否有效
   else
   memo1.Lines.loadfromfile(filelistbox1.filename);
   AssignFile(f,filelistbox1.filename);   //文件变量与文件名关联
   Reset(f);   //把文件指针移到文件首
   size := FileSize(f);   //得到文件的长度
   S:= IntToStr(size)+'bytes';
   txtedit.text:=s;   //输出
   closefile(f);


End;


end.