Register Event Crashes LabVIEW if Event Type isn't Selected.

Hi I think I have found a possible bug in LV2011 SP1.
- Wire a Reg Event property node to the Dynamic Event Registration Terminal of an event structure
- Add an event case
- Click the Dynamic Event
- LV Crashes
Source code included, try to add the unspecified event and watch as LV crashes.
Br,
/Roger
Solved!
Go to Solution.
Attachments:
LVCrash.vi ‏5 KB

Intaris wrote:
I had a case very similar to this today, I think it was to do with exactly what you describe but it was in LV 2012.
I seem to have a knack of crashing LV. I'm really good at it. Maybe I should be an internal tester for NI?
Shane.
What? they do testing? When did this happen?
I'm just kidding, or, perhaps not?
We all like to Love/Hate NI, right?

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Attachments:
callback vi.png ‏8 KB
register event callback.png ‏8 KB

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Joe is correct on this one. The callback where designed to take variants as their inputs, so that they are more flexible. In addition Variants are used through out ActiveX programming.
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Solved by my own:
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I refer to the blog
<a href="/people/thomas.jung3/blog/2004/09/01/using-net-windows-controls-in-the-abap-control-framework:///people/thomas.jung3/blog/2004/09/01/using-net-windows-controls-in-the-abap-control-framework
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Register event in producer consumer design pattern

Hello wire workers,
I am fairly green when it comes to dynamic event registration, so my understanding of it is probably quite flawed, but what I have implemented seems to work fine.
Assuming a fairly typical queued producer/consumer state machine architecture.
Up till now, I have done the dynamic event registration outside (i.e. to the left of) the UI loop, so all events get registered before the UI loop starts to run.
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The best way to send data from the Consumer Loop to the Producer Loop is through User Events. What you will want to do is create a User Event whose data type is the registered DAQmx event refnum. Then when you register the DAQmx event in the Consumer Loop, fire the User Event with that new refnum and update the registration in the Producer Loop. That's probably hard to wrap your head around in words, so I'll attach a dummy example and pic below. Hope this helps!
VI Saved in LV85.
Message Edited by Jarrod S. on 04-21-2008 12:54 PM
Jarrod S.
National Instruments
Attachments:
DAQmx Event.vi ‏30 KB
DAQmx Event Pic.PNG ‏38 KB

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Hi!
I am trying to control a motor in LV2013 using the ActiveX concept. When I use a "register event callback VI" function, can I call the same VI that calls a VI (with the "stop rule" controlled be the user data terminal, of course, inside)? By default, callback Vis that one can create for this are all reentrant (preallocated clone) and synchronious (according to help). However, both when I use the "server VI reference" ("This VI") and when I create a reference and browse for the same file - "register event callback" shows me a broken wire.

_Basil_ wrote:
As far as I understood, putting a movement method in the loop will not give any result, so I tought in the direction of the recursive callback. However, I found this post. Would you in general agree that the callback VI cannot be recursive? I attach my code in LV13 (if you need me to convert, I will)
Sorry, I'm still on LabVIEW 2012 here, so can't look at your VIs. I don't understand your comments in these sentences though. What do you mean by putting a movement method in a loop will not give any result? And why would you ever want a recursive callback? The callback is called each time the event occurs. There's no sense in making it recursive, nor would you want to re-register for a callback on an event inside a callback VI. Normally a callback should contain very little logic; it should primarily pass some piece of information (through a queue, user event, etc) back to the main thread and let the main logic handle it.

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I have been running into an issue regarding the building of an executable that has register event callbacks (specifically Test Stand Callbacks). The VI that is responsible for setting up the event registration is an asynchronous VI. During development everything works but during deployment of an executable the Callback is either not running or capturing the event from the Test Stand engine (I am looking for the end of execution event). The setup is not reporting an error, and the pathing to the callback VIs is correct. Any Ideas on this?
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akonecki wrote:
Hi,
I have been running into an issue regarding the building of an executable that has register event callbacks (specifically Test Stand Callbacks). The VI that is responsible for setting up the event registration is an asynchronous VI. During development everything works but during deployment of an executable the Callback is either not running or capturing the event from the Test Stand engine (I am looking for the end of execution event). The setup is not reporting an error, and the pathing to the callback VIs is correct. Any Ideas on this?
Does the Teststand engine not post a endexecution callback when running from a executable labview environment?
Thanks,
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I try to understand dynamically register for events.
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You should try working with standard events before using dynamic events.
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Attachments:
Dynamically Register for Events.png ‏6 KB

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Try below suggestion, in my opinion there isn't a standard config to define the sequence since there cannot be a fixed sequence since requirement might differ from customer to customer:
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Register Event Crashes LabVIEW if Event Type isn't Selected.

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