How to get list of events from an Event Registration Refnum (as variant)

[Axelwlt]

With VI Scripting, I can get the data type of an Event Registration Refnum as variant. How could I get the list of events (at least their names) that it contains?

I need that to know what events are registered in an event structure, and at what indices, in order to manipulate the dynamic events in the structure with Scripting.

[Francois Normandin]

You can extract the labels from the type descriptor, once you know where to find them in the array.

I added support for it in this open source DataManipulation library. Check out the OpenDescriptor palette.
You can install the latest release (1.1.0.5) from here: https://github.com/LabVIEW-Open-Source/DataManipulation/releases/tag/1.1.0.5 (download VIP file and install with VIPM).

Once installed, you'll find the "List Element Names" method under Addons>DataManipulation>OpenDescriptor palette.
(It can list enums and cluster elements as well, although those are natively supported under the Variant Utilities palette.)

Edited June 4, 2019 by Francois Normandin
changed a word.

[Axelwlt]

Thank you François, that's a nice library!

Would it be possible to also get the event types from the TD (User Event/Mouse Up/...)? I don't find where this data is located in the TD.

Ideally the event type should be a "vi.lib\event_ctls.llb\lveventtype.ctl" (so that it matches with the EventStructure:Get Handled Event method), but I don't know if the values match . In the enum, User Event is x41, but there is no x41 at all in the TD.

[Francois Normandin]

They show up as Generic Refnums. (0x08)
If they are named refnums, they should show up as in this example where "This VI" is the label. You can tell if they are named references by the 0x40 flag.

If your events are named, they will show up in the list. The type of event is set in the last long byte in the "First Element" highlighted in green in the screenshot. (xA4 10)
xA4 = VI reference, x10 = Key Down. I'll add this support to the OpenDescriptor. That is definitely useful info to get! I'll report here when done.

 

[Francois Normandin]

Version 1.2.0.6 released.
https://github.com/LabVIEW-Open-Source/DataManipulation/releases/tag/1.2.0.6

Added support to return a list of Event reference types (class of event) for Event Registration Refnums

• Controls, Panes, Splitters, VI References and Application References.
• Array is empty for all other datatypes.

 

 

** Please note that this does not drill into clusters of Event Registration Refnums. This is only one-level deep. I have not tried, but I assume that getting the cluster elements and then looping on those should work...

 

Edited June 6, 2019 by Francois Normandin
added comment about cluster of event registrations.