Delphi 动态创建不同线程类（继承自一个线程基类）

unit Unit1;

interface

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

type
  tmythreadclass = class of tmybasethread;
  //基类
  tmybasethread= class(TThread)
  private
    procedure test;
   protected
     procedure Execute; override;
   public
    constructor Create(CreateSuspended: Boolean); virtual; //要设置成虚函数 不设置的话，继承的类就不会执行到create 来
  end;
 //继承派生mythread1
  Tmythread1 =class(tmybasethread)
  private
    procedure test;
   protected
     procedure Execute; override;
  public
   constructor Create(CreateSuspended: Boolean);override;
  end;


  TForm1 = class(TForm)
    btn1: TButton;
    mmo1: TMemo;
    procedure btn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}


constructor tmybasethread.Create(CreateSuspended: Boolean);
begin
 inherited Create(False);
// Form1.mmo1.Lines.Add('tmybasethread');
end;


procedure tmybasethread.Execute;
begin
  FreeOnTerminate := True;
   Synchronize(test);
end;

procedure tmybasethread.test;
begin
 form1.mmo1.Lines.Add('tmybasethread');
end;


constructor Tmythread1.Create(CreateSuspended: Boolean);
begin
 inherited Create(False);
end;

procedure Tmythread1.Execute;
begin
 inherited;
 Synchronize(test);
end;

procedure Tmythread1.test;
begin
 form1.mmo1.Lines.Add('Tmythread1');
end;

procedure TForm1.btn1Click(Sender: TObject);
 //模仿applicaiton.createform的写法
 procedure threadcreate(athreadclass:tmythreadclass;  var mythread);
 var
  Instance: tmybasethread;
 begin
   Instance := tmybasethread(athreadclass.NewInstance);
   tmybasethread(mythread) := Instance;
   try
     Instance.Create(False);
   except
     TComponent(mythread) := nil;
     raise;
   end;
 end;

var
 my1:Tmythread1;
begin
  threadcreate(Tmythread1, my1);
  my1.Suspend;
end;

end.