frmdemo.pas

来自「我收集的一些Delphi动态连接库资料」· PAS 代码 · 共 69 行

unit frmDemo;

interface

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

type
//---这里声明需要用到的DLL中对象的方法---

  TVehicle = class(TObject);
  TCar = class(TVehicle)
  public
    procedure drive;virtual;abstract;
  end;
  TBicycle = class(TVehicle)
  public
    procedure ride;virtual;abstract;
  end;

//----------------------------

  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:TCar ;external 'DemoSvr.dll';
  function BicycleObj:TBicycle ;external 'DemoSvr.dll';

implementation

{$R *.dfm}

procedure TForm1.Button2Click(Sender: TObject);
var MyCar:TCar;
begin
  MyCar:=CarObj;
  if Mycar=nil then exit;
  try
    MyCar.drive;
  finally
    MyCar.Free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var Bicycle:TBicycle;
begin
  Bicycle:=BicycleObj;
  try
    Bicycle.ride;
  finally
    Bicycle.Free;
  end;
end;

end.