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Form1.Canvas.Lock;
For i := 0 to 10000 do
  begin
    Form1.Canvas.TextOut(20,20,str);
  end;
Form1.Canvas.UnLock;ÉÏÃæÕâ¸ö´úÂëÖУ¬LockºóÔÙÑ­»·£¬ÔòÑ­»·½á¹¹¹ýÓÚÓµ¼·£¬Ëø¶¨Ê±¼ä¹ý³¤¡£ËùÒÔÓ¦¸Ã½«LockÓëUnLock·ÅÔÚÑ­»·ÀïÃæ¡£
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{Ö÷´°Ìå´úÂë}
unit Main;

interface

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

type
TForm2 = class(TForm)
MainMenu1: TMainMenu;
S1: TMenuItem;
T1: TMenuItem;
procedure S1Click(Sender: TObject);
procedure T1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form2: TForm2;
List:TList;
implementation

uses DrawThread;

{$R *.dfm}

procedure TForm2.FormCreate(Sender: TObject);
begin
List:=TList.Create;
end;

procedure TForm2.FormDestroy(Sender: TObject);
begin
List.Free;
end;
//“¿ªÊ¼”²Ëµ¥
procedure TForm2.S1Click(Sender: TObject);
var
value:string;
i: Integer;
begin
value:=InputBox('Ìáʾ','ÇëÊäÈëÐèÒª´´½¨¶àÉÙỊ̈߳º','3');
try
for i := 0 to StrToInt(value) - 1 do
List.Add(TDrawThread.create(self));
except
on e:Exception do


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