Force "Wait on Occurrence" function to stop waiting

Question

Hi all,
is it possible to interrupt the "Wait on Occurrence" function, so that it stops waiting?
That's my situation:
In my VI, I'm using occurrences to get event messages from the windows API. See here: http://www.ni.com/example/29394/en/ for an example code. One part is a DLL which takes the reference of the occurrence and sets an occurrence each times an event happens (e.g. mouse down, etc.). In the case, the VI is closed it's necessary to abort waiting to the occurrence immediately, otherwise the application becomes idle until any event happens.
Solved!
Go to Solution.

Answer 1

I haven't looked at the code in years, so I don't really remembers what it looks like, but what's preventing you from splitting the occurence wire to the point where you know the VI stops and setting the occurence there? Obviously, this will cause your code to think that an event occured, so you might need to add another mechanism to mark that this is not the case, but it should be doable.
Another alternative is to use the timeout. Obviously, this will make it poll, with all the implications of that, so that's up to you.
A third option is to add a layer between the occurence and your actual code, which is basically what Nathan suggested, but this suggestion is for doing it on the LV side instead of in the DLL. This doesn't solve the issue you're having (you would still need to write the code to handle it) and it makes the system more complicated, but it can make the API that your final code sees more clean (e.g. using two events). Depending on what the code looks like, this might require some daemons, etc., so you might not want this.
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