Wrap the ActiveX control in a lvclass?

I am trying to wrap an ActiveX control in a class. I use a Refnum of the automation of the private cluster for containing the reference to the class, create the open instance of ActiveX Automation and the private refnum allows access to the class. Very well. But without the destructor semantics how can I make sure that the ActiveX object is released properly? Also, private refnum ActiveX seems to come back to null when I transition vi at vi. I have to do an automatic open after unbundling the refnum every time?

Nobody prevents you from implementation of constructor and destructor of yourself. Create a static dispatch VI, which creates an instance of your ActiveX object and create a dynamic distribution VI in order to release it (you can inherit from your class if you need to). The semantics of use your wrapper is the same as working with plain ActiveX refnums: you call your Shredder VI explicitly, you would have to do with "close Reference primitive." I wrapped a full hierarchy of objects this way COM and it works fine. BTW, you can take a look at Endevo GOOP Developer Suite: it simplifies the use with classes and provides a class with the constructor and destructor model, as described above. Unfortunately I have no idea why your automation refnum becomes invalid. Do you use it outside your class and accidentally somewhere close? Maybe OT, but if you need an accessor for the private refnum, you can use a trick to protect to close: wire your original refnum for both inputs of a primitive "Data Variant" and return to the refnum resulting: so you increment the counter of your COM object reference You can (and should) close the refnum safely without affecting your private.

Tags: NI Software

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