delphi 根据字符串找到函数并执行

关键字：MethodAddress：取得方法的地址，这个方法需要是published的。

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.