Re : Read value from variant of cluster

[m-ad]

Hello everybody,

my simplified scenario is this: I have N clusters, C1, C2, ... CN. They are different but all of them contain a double named D. I want to design a VI that takes in any of those clusters (cluster->variant first) and returns D. I tried to use the Get Variant Attribute with 'D' as name input, but that doesn't work. How can I achieve my goal?

[sabri.jatlaoui · Accepted solution]

HI m-ad,

There is a VI call Get Cluster Element by Name_ogtk.vi ib openg toolkit package which do that!

You can find the package on VIPM.

I made you a screenshot.

Regards

[ChrisK88]

If you don't want to use toolkits, here is how you do it with primatives..

[ChrisK88]

Better yet, here is the snippet, use this..

If you only care about your "D" label, then just code up the "D" selection in the case structure..

[ChrisK88]

Where the reference is to "Cluster 2" is wrong.. I don't know why the snippet keeps creating that, replace it with a Reference to the Cluster control, then it will work

[RavensFan]

LabVIEW's built-in VI snippets always breaks references and event structures.

Use the Code Capture Tool and you won't have that problem.

[DavidBoyd]

While the marked solution (to use the excellent OpenG toolkit) is clearly my first choice, since someone else spoke about avoiding toolkits, I'll mention that more variant support is built in to the native LabVIEW distribution.  You can also find a solution in the VIs under: <vi.lib>\Utility\Data Type, starting with "Get Cluster Information.vi".

And I'd say that the suggestions involving references to controls, and property nodes, are no solutions at all.  None of what you're asking for needs to work with front panel references.

Dave