topic Re: Get specific data type of numeric control by reference in LabVIEW

Get specific data type of numeric control by reference

Quiztus2 — Tue, 25 Oct 2022 21:06:01 GMT

Is there a property to figure out if a numeric controls data type is e.g U32 or I64? I hand the control to a SubVI by reference.

Re: Get specific data type of numeric control by reference

Gregory — Tue, 25 Oct 2022 21:11:35 GMT

There is a property called "Representation" when you enable scripting.

Re: Get specific data type of numeric control by reference

Quiztus2 — Wed, 26 Oct 2022 07:35:34 GMT

Thanks for suggesting Representation. I can't find this on my properties.

Is there no way without Scripting?

edit: I enabled scripting and now Representation shows up. Thx

Re: Get specific data type of numeric control by reference

pincpanter — Wed, 26 Oct 2022 07:36:55 GMT

Beware that scripting properties are not available in executables.

Re: Get specific data type of numeric control by reference

Quiztus2 — Wed, 26 Oct 2022 07:49:01 GMT

I have a .ctl containing different Rings and Numerics. I hand this .ctl via it's reference to my SubVI, because the Rings StringsAndValues[] are edited.

If I pass the .ctl via Value those StringsAndValues[] are lost. That is the reason I have to pass by Ref.

So can I cast my reference to my specific control then? If yes, how do I generate a class from my specific .ctl ?

Re: Get specific data type of numeric control by reference

pincpanter — Wed, 26 Oct 2022 07:54:42 GMT

You can pass your reference as generic Control (as you probably are already doing), use "To More Specific Class" and check whether an error is thrown. But you must try with all possible types.

Edit: if the subvi expects only one type, you must pass a typed reference. To change the reference type, drag a control of desired type into the reference terminal control of the subvi.

Re: Get specific data type of numeric control by reference

Basjong53 — Wed, 26 Oct 2022 09:42:07 GMT

As simpler way is to use the Get Type Information.vi.

Control reference is a generic Control GObject. Make this into a subVI and wire your control reference to it. You'll get a coercion dot, since it converts to the generic GObject class. However, you'll still get the correct data type.

Re: Get specific data type of numeric control by reference

Gregory — Wed, 26 Oct 2022 14:19:18 GMT

@pincpanter wrote:

Beware that scripting properties are not available in executables.

I believe this one is available in the runtime engine.

Re: Get specific data type of numeric control by reference

pincpanter — Thu, 27 Oct 2022 08:30:31 GMT

@Gregory ha scritto:

@pincpanter wrote:

Beware that scripting properties are not available in executables.

I believe this one is available in the runtime engine.

You are right. Thanks, I learned something new.

Re: Get specific data type of numeric control by reference

Quiztus2 — Sat, 29 Oct 2022 14:27:07 GMT

If I understand correctly, not all festures of scripting are available in builds. How does one know? What about real time targets?

Re: Get specific data type of numeric control by reference

Gregory — Sun, 30 Oct 2022 05:26:03 GMT

Look at the help for the property in question.