【记录一下】lazarus多线程的用法

网友“蓝天白云”在qq群问lazarus多线程的问题，以下代码是“啊D”给出的，但编译出错。

procedure TForm1.Button2Click(Sender: TObject);
begin
  memo1.Text := 'start...';
  TThread.CreateAnonymousThread(
  procedure
  var
  i: integer;
  begin
    Sleep(1000);
    for i := 0 to 99999 do
      TThread.Synchronize(nil,
      procedure
      begin
        Form1.memo1.Text := IntToStr(i);
      end
    );
    memo1.Text := 'end.';
  end
  ).Start;
end;

如需编译上述代码需要fpc 3.3.1及用

{$mode delphi}
或
{$mode objfpc}{$H+}
{$ModeSwitch ANONYMOUSFUNCTIONS}

就可以正常编译。

unit Unit1;

{$mode objfpc}{$H+}
{$ModeSwitch ANONYMOUSFUNCTIONS}

interface

uses
  Classes, SysUtils, Forms, Controls, Graphics, Dialogs, StdCtrls;

type

  { TForm1 }

  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Memo1: TMemo;
    procedure Button2Click(Sender: TObject);
  private

  public

  end;

var
  Form1: TForm1;

implementation

{$R *.lfm}

{ TForm1 }

procedure TForm1.Button2Click(Sender: TObject);
begin
  memo1.Text := 'start...';
  TThread.CreateAnonymousThread(
  procedure
  var
  i: integer;
  begin
    Sleep(1000);
    for i := 0 to 99999 do
      TThread.Synchronize(nil,
      procedure
      begin
        Form1.memo1.Text := IntToStr(i);
      end
    );
    memo1.Text := 'end.';
  end
  ).Start;
end;

end.