Confused about the use of accessors with classes.

With a new assignment thought, it would be appropriate to increase the use of labview OO features. In my case, I'm trying to use a class to contain a bunch of different calculations. The calculations require multiple entries to finish so I built a control to take care of these data. My plan was to build separate methods for each calculation. This will allow to easily add new calculations and considering that many calculations depend on preliminary calculations seem to be an excellent opportunity to learn a new part of labview.

My problem is to find an elegant way to complete this great control; I believe that I must write accessor vi to allow outside access to the objects. I don't know if there should be one vi for EACH parameter accessor, or if I can access these items in a cluster.

I can only relate to the use of get / set in .NET and usually I would write one for each variable that I have access to. I'm not sure how to proceed in LabView. Any ideas would be great.

I enclose a few images. One showing just a sumple calculation and one of my ctl. Still, my main question is what is the best way to populate the items in this list.

-Chris

Since there is no such thing in LVOOP as public members of class (and thank God / NOR) you must always provide accessors (getters/setters) to join the data members of the class outside of the classroom.

Inside the method of class VI, there is no need for them since you can reach directly from the wire with bundle/unbundle (like photos).

I've implemented a similar class that performs calculations and I chose to use the recursive calls to deal with the problem of some variables must be calculated before the others.

I'm a member of the VI class called GetCalculatedVariable.vi which takes the name of the variable to calculate input (like typedefed enum).
Inside of this VI have a structure dealing with a box for each variable that can be calculated.

The inside of the box, I define the calculation, and if I ever need another variable, I here call GetCalculatedVariable.vi recursively.

In addition, I also have a CalcBuffer so I don't have to call GetCalculatedVariable.vi more than once for each variable.

The class also has a GetMeasuredVariable.vi which also uses the recursion in the same way, but works on my measurement files instead.

The advantage is that my application code gets very clean because it contains only a single Subvi callto obtain and use any calculated variable.

I also have a GetCalculatedVariables that takes an VariableNames array and returns an array of values.

I hope this helps...

Tags: NI Software

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