Null Broadcast Events--constant.vi

[ben64]

Where can I find more information on the Null Broadcast Events--constant use? The documentation is not very helpful.

Ben

[Gregory]

Hi Ben,

I believe it can be used if you will be registering for events later in the application. For example, if you enter the event structure before the module which broadcasts those events has been launched, you can use the null broadcast events constant before the event structure. Then when the module is launched, you will re-register for the events inside the event structure.

[ben64]

Before DQMH 6.1 Obtain Broadcast for Registration was used even if the module was not started. The events were registered again inside the event structure when the Start Module.vi was called. I still wonder how to use this new vi?

Ben

[Enrique.Noe]

Hi, this is just a constant vi with null references

You can use it to unregister an event structure already subscribed to an event.

This way you can subscribe with the previous existing methods and unsuscribe programatically.

Best regards,

Enrique.

[joerg.hampel · Accepted solution]

We added the null bc events vi both to make it easier to unregister from the broadcast events. 

For me personally, this is a very important addition to DQMH: It perfectly captures the intent of the software to explicitly use invalid references:

- either to just define the events' datatypes at edit time without actually registering for them - that's usually when we use it to set up the event registration reference outside (ie before) the event structure

- or to unregister from a module's broadcasts from within an event structure

[ben64]

Thank you all, it is clearer now!

Ben