COM/ActiveX by default or non-specific interface

Let's say I have a non-Visual activex control that implements 2 interfaces: IStuffInterface and IStuffInterface2.

IStuffInterface2 derives from IStuffInterface and adds a little more functions.

+ - Property2a
+ - Property2b
+ - Method2a
+ - IStuffInterface
+- + Property1a
+- + Property1b
+- + Property1c

In applications VC ++ I can usually try an IStuffInterface2 query and use it. If this is NOT available, I can do plan-B and try to mark for older, IStuffInterface and IStuffInterface2 to disable the related application functions. Even simpler, if the VC application ++ doesn't require something IStuffInterface2 I know that there will be held will be of all versions of the control.

How do you do this in LabVIEW? So far, of what I learned about LV if you put a control or an activex on a panel refnum is somehow BINDED to a specific type library and the interface. He seems to want to say that if I create a LV application with the version of the most up-to-date activex control, the LV application does not work on a system with an earlier version (even if technically the old control can fill in the application control contract). Even if I don't do the application of LV uses only the methods and properties of the original IStuffInterface it seems unable to use the old interface if a more recent version, there is one on the system.

How to make sure that an existing LabVIEW application will run with what version of the control is present on the system?

What LabVIEW unconditionally with default COM interface?

You can choose a particular interface programmatically? Then how configure you the pre-wired VI as the type information are unknown?

Thank you


Tell me if I'm wrong, but I believe that what you're looking for is cast... you can find a lot of information about it searching around the forums and knowledge bases, but these will probably help:

Tags: NI Software

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