unitfile.pas

Delphi 6分布式开发例程3.rar :)

unit Unitfile;

interface

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

type
  IInterface1 = interface
    ['{B443045D-A019-48B6-B524-6B9A64B3BACB}']
    function GetInfo:String;
  end;

  TInterface1Impl1 = class(TInterfacedObject,IInterface1)
    function GetInfo:String;
  end;

  TInterface1Impl2 = class(TInterface1Impl1,IInterface1)
    function GetInfo:String;
  end;

  IInterface2 = interface
    ['{0D392C0E-55EE-4489-9A79-AFB6B680F597}']
    function GetInfo:String;
    function MyGetInfo:String;
  end;

  TInterface2Impl = class(TInterfacedObject,IInterface1,IInterface2)
  public
    function IInterface2.GetInfo = MyGetInfo;
    function GetInfo:String;
    function MyGetInfo:String;
  end;

  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{ TInterface1Impl1 }

function TInterface1Impl1.GetInfo: String;
begin
  Result := '调用的是TInterface1Impl1.GetInfo!';
end;

{ TInterface1Impl2 }

function TInterface1Impl2.GetInfo: String;
begin
  Result := '调用的是TInterface1Impl2.GetInfo!';
end;

{ TInterface2Impl }

function TInterface2Impl.GetInfo: String;
begin
  Result := '调用的是IInterface1.GetInfo!';
end;

function TInterface2Impl.MyGetInfo: String;
begin
  Result := '调用的是IInterface2.GetInfo!';
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  MyInterface:IInterface1;
begin
  MyInterface := TInterface1Impl1.Create;
  Memo1.Lines.Append(MyInterface.GetInfo);
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  MyInterface:IInterface1;
begin
  MyInterface := TInterface1Impl2.Create;
  Memo1.Lines.Append(MyInterface.GetInfo);
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  MyInterface:IInterface1;
begin
  MyInterface := TInterface2Impl.Create;
  Memo1.Lines.Append(MyInterface.GetInfo);
end;

procedure TForm1.Button4Click(Sender: TObject);
var
  MyInterface:IInterface2;
begin
  MyInterface := TInterface2Impl.Create;
  Memo1.Lines.Append(MyInterface.MyGetInfo);
end;

end.