方法作为传递的参数示例代码

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  vp = procedure of object;
  TForm1 = class(TForm)
    Button1: TButton;
    CheckBox1: TCheckBox;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    procedure P1;
    procedure P2;
    Procedure P3(a:vp);
  end;

 

var
  Form1: TForm1;
  p:vp;
  flag:boolean;
implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  caption := '';
  flag := CheckBox1.Checked;
  if flag then
    p:= p1
  else p:= P2;
  p3(p);
end;

procedure TForm1.P1;
begin
  Caption := Caption + '-' + IntToStr(random(9));
end;

procedure TForm1.P2;
begin
  Caption := Caption + IntToStr(random(9));
end;

procedure TForm1.P3(a: vp);
var
  i:integer;
begin
  for i := 0 to 20 do
    a;
end;

end.