DELPHIÖÐÈçºÎ·­Ò³

ÎÒÔÚMEMOÖж¯Ì¬²úÉúÁË×é¼þ,µ«ÊýÄ¿½Ï¶à,ÏëÓÃBUTTON²úÉú·­Ò³µÄ¹¦ÄÜ,ÀàËÆPAGEUP,PAGEDOWN,Çë¸÷λ´óÀдͽÌ

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Delphi(Pascal) code:
sendmessage(memo1.handle,wm_vscroll,SB_PAGEDOWN,0)

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SendMessage(Memo1.Handle,WM_VSCROLL,SB_PAGEUP,0);

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´óÀÐ,û·´Ó¦,MEMOÊÇ·ñÓÐʲôÉèÖÃ?
unit Unit3;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,ExtCtrls, DB, DBTables,Dateutils;

type
  TForm3 = class(TForm)
    GroupBox1: TGroupBox;
    GroupBox2: TGroupBox;
    GroupBox4: TGroupBox;
    Label1: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Table1: TTable;
    Table2: TTable;
    Button1: TButton;
    Query1: TQuery;
    Memo1: TMemo;
    Button2: TButton;
    Button3: TButton;
    procedure FormShow(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
  procedure OnClick(  Sender:  TObject&nbs