界面问题请教

Question

在一个Memo中显示信息时，如果一次显示不下，如何在界面上做两个按钮，作为翻页功能？比如 点一下 “下翻页” ，memo中下面的内容显示出来，
点一下 “上翻页” ，memo中前面的内容显示出来，

Answer 1

sendMessage(Memo1.Handle,SB_PAGEDOWN,0,0)
sendMessage(Memo1.Handle,SB_PAGEUP,0,0)

Answer 2

sendmessage(memo1.handle,wm_keydown,sb_pagedown,0)

Answer 3

unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DBXpress, FMTBcd, DB, Grids, DBGrids, SqlExpr, StdCtrls;type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    Button3: TButton;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
var
  sFileName : string;
begin
 self.OpenDialog1.Execute;
 sFileName := self.OpenDialog1.FileName;
 self.Memo1.Lines.LoadFromFile(sfileName);
 self.Memo1.SetFocus;
end;procedure TForm1.Button3Click(Sender: TObject);
begin
//sendmessage(memo1.handle,wm_keydown,sb_pagedown,0)
sendMessage(Memo1.Handle,SB_PAGEDOWN,0,0)end;procedure TForm1.Button4Click(Sender: TObject);
begin
sendMessage(Memo1.Handle,SB_PAGEUP,0,0)
end;
end.什么反应也没有。光标还不能在 memo 中上下移动了，呵呵