frmdemo.pas

Delphi中的DLL封装和调用对象技术

unit frmDemo;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  function CarObj:ICar ;external 'DemoSvr.dll';
  function BicycleObj:IBicycle ;external 'DemoSvr.dll';

implementation

{$R *.dfm}

procedure TForm1.Button2Click(Sender: TObject);
var MyCar:ICar;
begin
  MyCar:=CarObj;
  MyCar.drive;
  Mycar:=nil;
end;

procedure TForm1.Button1Click(Sender: TObject);
var Bicycle:IBicycle;
begin
  Bicycle:=BicycleObj;
  Bicycle.ride;
  Bicycle:=nil;
end;

end.