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ÉÏÎÄÖУ¬¶àÏß³Ìͬ²½Ö÷´°ÌåµÄLabelµÄCaptionÊôÐÔÖµ£¬·¢ÏÖÒ»¸öÎÊÌ⣺ʹÓÃSynchronizeÓÃÓÚͬ²½µÄʱºò£¬Ö÷´°ÌåºÃÏñËÀµôÒ»Ñù£»¶øÖ±½ÓÓÃ×Ó³ÌÐòΪLabelµÄÒýÓø³Öµ£¬ÔòÓÐʱ»á³öÏÖ“Canvas  does not allow drawing”´íÎó¡£ÊéÉÏ˵VCLͬ²½Ò»¶¨ÒªÓÃSynchronize£¬¶ø²»ÄÜÖ±½Ó·ÃÎÊ¡£
    ²âÊÔ£º
{Ö÷´°Ìå}
unit Unit2;

interface

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

type
TForm2 = class(TForm)
Label1: TLabel;
Button1: TButton;
Label2: TLabel;
Label3: TLabel;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form2: TForm2;

implementation

uses TestThread;

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
begin
TTestThread.Create(Label1);
//TTestThread.Create(Label2);
//TTestThread.Create(Label3);
end;

end.{¶àÏß³ÌÀà}
unit TestThread;

interface

uses
Classes,StdCtrls;

type
TTestThread = class(TThread)
private
{ Private declarations }
FLabel:TLabel;
Fstr:string;
procedure UpdateLabel;
protected
procedure Execute; override;
public
constructor Create(Lab:TLabel);
end;

implementation

uses Unit2,SysUtils,windows;

{ TTestThread }

constructor TTestThread.Create(Lab: TLabel);
begin
FLabel:=Lab;
Inherited Create(False);
FreeOnTerminate:=True;
end;

procedure TTestThread.Execute;
var
i:Integer;
begin
{ Place thread code here }
for i := 0 to 20000 do
begin
if Not Terminated then
begin
Fstr:=Format('Ïß³ÌID£º%d,µÚ%d¸öÑ­»·',[GetCurrentThreadID,i]);
//UpdateLabel;
Synchronize(UpdateLabel);
end;
end;

end;

procedure TTestThread.UpdateLabel;
begin
FLabel.Caption:=Fstr;
end;

end.
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