check if a reference on a control is valid

[pdupre]

Hello,

I used to use reference on control when calling a sub Vi.
I would like to check in the subVi if this control is really connected for example, in other word if it is reallay a reference to a control (or indicator).
How can I do it ?

thank.

[Pnt]

If the reference is not valid you will get an error when calling a property node (or invoke), at the error cluster output.

You should always wire it, if you are not sure about your references

Message Edited by Pnt on 07-25-2008 03:28 PM

[JB]

Not a Number/Path/Refnum? is your friend. Functions palette >> Programming >> Comparison

[Ben]

30 seconds ago there were no replies. I should aviod the "low hanging fruit" 

Ben

Message Edited by Ben on 07-25-2008 07:30 AM

[TCPlomp]

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@Ben wrote:

30 seconds ago there were no replies. I should aviod the "low hanging fruit" 

Ben

Message Edited by Ben on 07-25-2008 07:30 AM

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Well wouldn't it be nice to link to the online help of the function?
Or perhaps a picture from the online help:


Ton

[Hypiz]

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@TCPlomp wrote:
Well wouldn't it be nice to link to the online help of the function?

LOL, I was lazy to start LabVIEW to get to that help page so I decided to google it and this thread was the first hit. So you were right it was nice. 🙂