如何访问后期绑定的嵌套属性和方法？

HNetCfg.FwMgr

{$APPTYPE CONSOLE}

uses
  Variants,
  ActiveX,
  Comobj,
  SysUtils;

//in this function i don\'t use any \"helper\" property to hold the temp value of the properties.
function FirewallIsActive1 : Boolean;
var
  Firewall : OleVariant;
begin
  Firewall := CreateOleObject(\'HNetCfg.FwMgr\'); 
  Result   := Firewall.LocalPolicy.CurrentProfile.FirewallEnabled;
end;


//here i hold the value of the LocalPolicy property 
function FirewallIsActive2 : Boolean;
var
  Firewall : OleVariant;
  Policy   : OleVariant;
begin
  Firewall := CreateOleObject(\'HNetCfg.FwMgr\');
  Policy   := Firewall.LocalPolicy;
  Result   := Policy.CurrentProfile.FirewallEnabled;
end;


//Here i use  a  \"helper\" variable for each property
function FirewallIsActive3 : Boolean;
var
  Firewall : OleVariant;
  Policy   : OleVariant;
  Profile  : OleVariant;
begin
  Firewall := CreateOleObject(\'HNetCfg.FwMgr\');
  Policy   := Firewall.LocalPolicy;
  Profile  := Policy.CurrentProfile;
  Result   := Profile.FirewallEnabled;
end;


var
  i : Integer;
begin
 try
    CoInitialize(nil);
    try
      Writeln(BoolToStr(FirewallIsActive1,True));
      Writeln(BoolToStr(FirewallIsActive2,True));
      Writeln(BoolToStr(FirewallIsActive3,True));
      Readln;
    finally
      CoUninitialize;
    end;
 except
    on E:Exception do
    begin
        Writeln(E.Classname, \':\', E.Message);
        Readln;
    end;
  end;
end.