Delphi的函数指针

不求全面，先留个爪：

  TNotifyEvent = procedure(Sender: TObject) of object;
  TMethod = record
    Code, Data: Pointer;
  end;

判断两个按钮的事件是否相等：

procedure TForm1.Button5Click(Sender: TObject);
var
  f1,f2: TNotifyEvent;
begin
  f1:=Button1.OnClick;
  f2:=Button2.OnClick;
  if (@f1=@f2) then begin ShowMessage('相等'); end
  else begin ShowMessage('不相等'); end;
end;

procedure TForm1.Button6Click(Sender: TObject);
var
  t1,t2: TMethod;
begin
  t1:=TMethod(Button1.OnClick);
  t2:=TMethod(Button2.OnClick);

  if t1.Code=t2.Code then
    showmessage('method.Code is same');
  if t1.Data=t2.Data then
    showmessage('method.Data is same');
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
  if Addr(Button1.OnClick)=Addr(Button2.OnClick) then
    showmessage('ffffff');
end;

参考：

http://blog.csdn.net/linzhengqun/article/details/1755493