How to check if a user event is registered before you destroy?

I have a number of screws running asynchronously each registrant to manage a common user event. During the shutdown, each of these screws is unregistered for this event. Now I want to destroy the event.

Or reference material on user events recommends I wait that all event handlers are registered before destroying the event, and I would like to do this way, even though the waiting may not be necessary in a situation of judgment (suggested in another thread of discussion).

So my question is: how to check if a user event is canceled completely before I have destroy it?

In other words: is there a way to see the event handlers registered how a given user event has? I am currently using this VI (see below) to track the number of registered event handlers:

(let's call it with + 1 when you register a handler,-1 when the cancellation of registration). However, it feels like a hack, and I wonder if there isn't a more appropriate way to do so. Ideally, a sort of built-in? This looks like something that LabVIEW would need to keep track of...

Thanks in advance,

-Kevin

Kevin,

I looked through a documentation to verify whether or not a VI as it exists and unforunately library VI does not contain a means for the user to track the number of events. If we had a VI in the library with the functionality you're looking for it would probably work very similar to your under the hood.

-Nick-

Tags: NI Software

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