1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
|
type
IVersion1=interface
['{C04A6AE1-8F31-4893-A255-79E49AAFDFE9}']
procedure SayHello;
end;
IVersion2=interface
procedure SayHello;
end;
TVersion1=class(TInterfacedObject,IVersion1)
procedure SayHello;
destructor Destroy; override;
end;
TVersion2=class(TInterfacedObject,IVersion1,IVersion2)
private
function GetVersion1:IVersion1;
public
destructor Destroy; override;
procedure SayHello;
property Version1:IVersion1 read GetVersion1 implements IVersion1;
end;
destructor TVersion1.Destroy;
begin
ShowMessage(ClassName+' say good bye');
inherited;
end;
procedure TVersion1.SayHello;
begin
ShowMessage(ClassName+' say hello');
end;
destructor TVersion2.Destroy;
begin
ShowMessage(ClassName+' say good bye');
inherited;
end;
function TVersion2.GetVersion1:IVersion1;
begin
ShowMessage('New Version1');
Result:=TVersion1.Create;
end;
procedure TVersion2.SayHello;
begin
ShowMessage(ClassName+' say hello');
end;
procedure TForm1.FormCreate(Sender: TObject);
var
v2:IVersion2;
v1:IVersion1;
begin
v2:=TVersion2.Create;
v2.SayHello;
v2.QueryInterface(IVersion1,v1);
v1.SayHello;
end; |
Partager