字符串 函数 Delphi 根据字符串找到函数并执行的实例

unit Unit1; 
 
interface 
 
uses 
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
 Dialogs, StdCtrls; 
 
type 
 
 TShowInfo = procedure(info:string) of object;  //声明一个procedure类型，参数和ShowInfo一致 
 
 TForm1 = class(TForm) 
  Button1: TButton; 
  procedure Button1Click(Sender: TObject); 
 private 
  { Private declarations } 
 public 
  { Public declarations } 
 
 published 
  procedure ShowInfo(info:string); 
 end; 
 
var 
 Form1: TForm1; 
 
implementation 
 
{$R *.dfm} 
 
{ TForm1 } 
 
procedure TForm1.ShowInfo(info: string); 
begin 
 ShowMessage(info); 
end; 
 
procedure TForm1.Button1Click(Sender: TObject); 
var 
 s:TShowInfo; 
begin 
 @s := MethodAddress('ShowInfo');    //取得ShowInfo的地址 
 if @s <> nil then           //如果不为空 
 begin 
  s('中华人民共和国');         //执行 
 end; 
end; 
 
end.