Private data LVOOP Parent returned when the child instance created from constant

I created a parent class and child class.  For each of these classes, I created a member who is a builder, whose purpose is to initialize constants for each class and return the instance of the class VI.  I also have an accessor Member VI for each class that returns private data of the class (in this case, a single string for each class).

Private class data Parent 'String' is set to "text Parent" as default.

Private data of the class of the child 'Child String' are set to 'Child text' as a default.

The Parent class constructor works very well.  For testing purposes, I'll be back the text of unbundling of directly the manufacturer VI, as a return of the VI accessor. The Parent constructor starts from a class constant.

However, in the case the constructor of class as a child, if I start from a class constant, unbundling directly private data (using a feature of unbundling by name and choosing "Child String" as the element), I get the private parent data!

If I use the Member of the class of the child VI to retrieve the text, I get the private data of the child.

If I change the constructor from a class of control instead of a constant class, I get the private data of the child.

This occurs only until the child class has existed as a control flag. that is, if I ungroup private data, after the class is returned by any Member VI, I get the private good child data.  Then, of course, something changes once the class 'data' has been a control at a given time.

I'm using Labview 8.6.1, Windows XP

I have attached a small project that demonstrates the problem that I encounter, without actually doing initialization, just read.

Is this expected behavior?  Why does it matter if I start with a constant of class instead of a control of the class?  When you slide the block diagram in the project window, you will always have a constant.

Although I was able to reproduce your problem in LabVIEW 8.6.1, it seems to work fine in 2009.  I could not find a CAR ID, but at this point I can only assume that the behavior was not intended but it is set in 2009.

Let me know if you need me to find more details.

Tags: NI Software

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