How to get the class name of LabVIEW Class Constants on the block diagram

[John Lokanis]

I am trying to automate some housekeeping tasks and have run into a problem.

I decided to rename some classes in my project.  In several VIs, I place those classes as block diagram constants.  I usually display their labels when I do this for readability.  Unfortunately, when I rename the class, the labels do not update.  (Fixing this would be a nice Idea Exchange feature).

So, I decided to write a little scripting VI to go though my BDs and find all objects of type LabVIEWClassConstant and then extract their new class name and use it to change the label.  I have done this in the past with front panel controls successfully by using the TypedefPath property to get the class name.

So, I traversed the BD and returned an array of LabVIEWClassConstant refs.  These were returned as GObjects so I had to cast them to LabVIEWClassConstant type before I can access the TypedefPath property.  But when I do this, the value returned from the TypedefPath is empty.  I am guessing this is because the cast loses the object's identity and makes it a generic LabVIEWClassConstant.

So, now am stuck.  Unless I find a way to get the actual class name, I cannot fix the label and must go manually fix it on every BD.

 

I think I am about to add VI Scripting to the realm of regular expressions. In other words, if you have a problem and you decide to solve it using VI Scripting, now you have two problems.

 

thanks for any ideas or pointing out obvious mistakes/misconceptions I may have made...

 

-John

 

[Darin]

Regexes and scripting are two of my favorite things.

 

In this case I would use the Terminal.datatype property of the LVClassConstant and pass the value to the GetLVClassInfo.vi found in vi.libUtilityVariantDataType

[John Lokanis]

Thanks!  That did it.  There are so many helpful things hidden away in vi.lib...

 

Here is my cleanup VI, if anyone else needs to do the same.

 

Class Label Cleanup.vi

[John Lokanis]

Added a new idea to the exchange relating to the issue I was trying to address.  Please kudo it!

 

http://forums.ni.com/t5/LabVIEW-Idea-Exchange/Update-LabVIEW-class-controls-and-labels-when-class-is-renamed/idi-p/2538984