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, ExtCtrls, jpeg;

type
  TForm1 = class(TForm)
    Image1: TImage;
    Timer1: TTimer;
    procedure FormCreate(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure Image1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
  Var
     Num:Integer; //表示计时器控件的Timer事件发生的次数

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Num:=0;
  Image1.Stretch :=True;   //使照片充满整个图像框
  Timer1.Interval:=500;  // 每隔0.5秒发生一次Timer事件
  Timer1.Enabled :=True;  //'启动计时器控件
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
   xh:Integer;
   CurDir,PicFile:string;
begin
   XH := Num Mod 8 ;//得到要展示的照片文件的序号
   GetDir(0,CurDir);
   PicFile:= CurDir+'\tzy'+inttostr(XH+1)+'.jpg';//形成要展示文件的文件名
   Image1.Picture.LoadFromFile (PicFile);//展示文件
   Num := Num + 1;  //准备展示下一张照片
   If Num=1000 Then  //如果Num的值很大，再把它置0
      Num:=0;
end;

procedure TForm1.Image1Click(Sender: TObject);
begin
  if MessageDlg('退出照片展示吗？',mtConfirmation, [mbYes, mbNo],0) = mrYes then
     begin
       close;
     end;
End;

end.