Use Item(i). Item(long Index, [out, retval] ITransducer* *pVal); means method with 1 input Index and Output Itransducer^.
Ludo > -----Message d'origine----- > De : fpc-pascal-boun...@lists.freepascal.org > [mailto:fpc-pascal-boun...@lists.freepascal.org] De la part > de Roberto Padovani > Envoyé : lundi 30 mai 2011 14:16 > À : FPC-Pascal users discussions > Objet : Re: RE : RE : RE : RE : RE : RE : [fpc-pascal] > support for using anactivex > > > Hi Ludo, > > I really cannot get the items to work. I simplyfied the > source code to the minimum in order to test the items stuff. > > var obj, item, items : variant; > > obj := CreateOleObject('WRGactiveX.Device'); // OK > items := obj.Transducers; // OK > writeln('Count: ', items.Count); // OK , > always prints 8 > > item := items.item[1]; // Crash: EOleSysError : Numero di > parametri non valido. > > Where the exception comment translates to "wrong number of > parameters". Instead, writing item := items[1] gives the > exception EVariantInvalidArgError : Invalid argument: Dispatch > > In the activex source code I hav these interface declarations: > > interface ITransducer : IDispatch > { > [propget, id(1), helpstring("property Name")] > HRESULT Name([out, retval] BSTR *pVal); > [propget, id(2), helpstring("property Status")] > HRESULT Status([out, retval] WRG_TransdStatus *pVal); > [propget, id(4), helpstring("property Meas")] > HRESULT Meas([out, retval] double *pVal); > }; > > interface ITransducers : IDispatch > { > [propget, id(1), helpstring("property Count")] > HRESULT Count([out, retval] long *pVal); > [propget, id(DISPID_VALUE), > helpstring("property Item")] HRESULT Item(long Index, [out, > retval] ITransducer* *pVal); > [propget, id(DISPID_NEWENUM), > helpstring("property _NewEnum"), hidden] HRESULT > _NewEnum([out, retval] LPUNKNOWN *pVal); > }; > > and used inside the IDevice class like: > > [propget, id(21), helpstring("property > Transducers")] HRESULT Transducers([out, retval] ITransducers* *pVal); > > > I would be very grateful if you could help me once more. > > Roberto > > > > 2011/5/25 Ludo Brands <ludo.bra...@free.fr>: > > Using variants you can transparently "walk" along the > exposed objects. > > The variant contains the Idispatch of the object and gets > the exposed > > methods at runtime. Properties are implemented as get and > put methods > > or just get methods for read only properties. > > > > If you have something like > > Itransducers = interface > > .. > > property transducer[Index:integer]:Itransducer; > > end; > > > > Then you would do > > transducer := transducers.transducer[index]; > > > > transducer := transducers[index]; works only if transducer is the > > default property for Itransducers. I'm not sure if fpc > supports this. > > > > Ludo > > > > > > -----Message d'origine----- > > De : fpc-pascal-boun...@lists.freepascal.org > > [mailto:fpc-pascal-boun...@lists.freepascal.org] De la part > de Roberto > > Padovani Envoyé : mercredi 25 mai 2011 19:34 > > À : FPC-Pascal users discussions > > Objet : Re: RE : RE : RE : RE : RE : [fpc-pascal] support > for using an > > activex > > > > > > 2011/5/25 Ludo Brands <ludo.bra...@free.fr>: > >> The code in article > >> > http://www.informit.com/articles/article.aspx?p=130494&seqNum=5 goes > >> a long way in doing what you want to do. Unit Eventsink > does pretty > >> much of the legwork. You should remove the procedure > register since > >> that is the Delphi way to get a component on the toolbar. > Remove also > >> the {$IFDEF VER100} and {$ENDIF}. The unit actually > includes the code > >> for InterfaceConnect!! > > > > found that! great! > > > > > >> As for the tlb conversion, in your case > >> > >> IEventIntfEvents = dispinterface > >> ['{168F5642-5751-49F5-9AA4-B8A7A5F6A5B8}'] > >> end; > >> > >> should do (that is for the events part). AFAIK the procedure and > >> dispid definitions are only needed for the server. You are only > >> concerned with dispid's. No need to create prototypes for > >> OnCommChanged() etc. EventSink1Invoke would be a simple > case DispID > >> of > >> 1: // do CommChanged > >> 2: // do StatesChanged > >> ... > >> end; > >> > >> > > > > Now I am "wasting" time making the tlb pascal definitions. For the > > event part I'm fine with the dispid's Until now I was calling the > > activex method with variants, in and out, but now I discovered that > > this IDevice class has a property like: property > > Sensors: ISensors; > > which inside is a list of items like Sensor: ISensor. > > > > Can I read the sensores with a variant? Then, to see the > fields inside > > each sensor, I think a I need a class to do that... The activex has > > all of these classes with the suitable dispinterfaces and > uuids and so > > on. But if I define > > var device, transducers, transducer : variant; > > and create > > device := CreateOleObject('Device'); > > then, can i simply write the following ? > > transducers := device.Transducers; > > transducer := transducers[index]; > > > > > > It's a long path until I get this stuff working... > > > > R# > > _______________________________________________ > > fpc-pascal maillist - fpc-pascal@lists.freepascal.org > > http://lists.freepascal.org/mailman/listinfo/fpc-pascal > > > > _______________________________________________ > > fpc-pascal maillist - fpc-pascal@lists.freepascal.org > > http://lists.freepascal.org/mailman/listinfo/fpc-pascal > > > _______________________________________________ > fpc-pascal maillist - fpc-pascal@lists.freepascal.org > http://lists.freepascal.org/mailman/listinfo/fpc-pascal > _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
