例如以下代码:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,Dialogs;
type
TForm1 = class(TForm)
procedure one();
function two(x,y:integer):integer;
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.one();
var
p : pointer;
begin
p:=@two;
end;
function TForm1.two(x,y:integer):integer;
begin
Result:=x+y;
end;
end.
在Delphi5中,没有任何问题,到了delphi7、2007、2009中就会报错:需要变量(Delphi6没试)
原因是新版本中要求返回函数地址的函数必须是全局函数,所以程序要改成这样:
................................
var
Form1: TForm1;
function two(x,y:integer):integer;
................................
function two(x,y:integer):integer; ......