面试-SizeOf一个对象会得到什么？

相关资料:

1.https://zhidao.baidu.com/question/283124338.html

 

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    FInteger :Integer;
    FBool :Boolean;
    FDouble: Double;
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  I: Integer;
begin
  I := 0;
  I := SizeOf(FInteger);
  ShowMessage(IntToStr(I)); //4
  I := SizeOf(FBool);
  ShowMessage(IntToStr(I)); //1
  I := SizeOf(FDouble);
  ShowMessage(IntToStr(I)); //8
  I := SizeOf(Button1);
  ShowMessage(IntToStr(I)); //4
  I := SizeOf(Edit1);
  ShowMessage(IntToStr(I)); //4  
  I := SizeOf(Form1);
  ShowMessage(IntToStr(I)); //4
  I := SizeOf(TForm1);
  ShowMessage(IntToStr(I)); //4
  I := Self.InstanceSize;
  ShowMessage(IntToStr(I)); //888
end;

end.