Delphi 根据字符串找到函数并执行的实例

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

实例代码:

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.

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02-06 22:13
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