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davidpcl

When calling Dynamic Dispatch VI's Allow A Class Constant To Be Used As An Alternative To The Object Reference

Status: New

TestStand now works incredibly well with LabVIEW Classes, but there is a slight annoyance with the fact that you cannot call a Dynamic Dispatch VI with an empty Object Reference. The implication of this is that when you want to use a .lvclass, for every class instance you have to call a VI that does nothing more than return a wrapped class constant which then populates an Object Reference. Technically this is not a problem, but it means that your Sequence becomes very quickly littered with these VI's and it would be nice if there was a way within the LabVIEW module adapter settings for a class member call if when you first call a Dynamic Dispatch VI that, as within LabVIEW you can just pass in a class constant rather than a previously populated Object Reference.

 

The Problem - All the LabVIEW calls prefixed with 'NEW' are simply returning a class constant.

 

Setup.png

 

A Potentially more integrated way of doing this

 


The Dynamic Dispatch input has the option of either passing in an Object Reference, or a class constant.

 

Adapter Settings Modified.png

 

 

All compatiable classes are listed in the value box now - either as .ctls, or alternatively as .lvclasses. This could also possibly be more akin to what happens in labVIEW when you call a Class which has available overrides that it gives you a tree view of the class hierachy to choose from.

 

Another way you could do this is to have a checkbox adjacent to the 'Class Path:' or 'Member Name:' named 'First Call' or 'New' or 'Construct' that then changes the 'Derived Class

 

Adapter Settings Modified2.png

 

 

David Clark
CLA | CTA
IDEX Biometrics UK Ltd
Hampshire, England
2 Comments
tyk007
Active Participant

Yes, yes, yes! Creating unnecessary wrappers for VIs creates problems for all our generic objects that we only occasionally use in TestStand

Elaine_R.
Active Participant

I have also gotten burned by this several times!