Panel close? event.

[labmaster]

I loaded "b.vi" by asynchronous way from a_asynch.vi [load] button then stop "b.vi" by pressing the [quit] button.
In this case, b.vi can loaded again in a_asynch.vi.

But if I press panel close ("X") in stopping b.vi, b.vi cannot be loaded again in a_asynch.vi.
Of course, This can be solved by stopping the while loop of b.vi (adding <This VI> - Panel Close?).

I confused a little bit because I have never added Panel Close? to my event structure usually.
Is it one of special things I have to take care in programming open VI reference?

labmaster.

[altenbach]

• You don't need any references. The Vi knowns it's own reference.
• You can use a plain "panel close" (notify event) event if you want to unconditionally stop the VI. You only need a "panel close?" (filter event!) event if you potentially want to discard the click on the [x].
• Not sure why you use such a strange mechanical action for the quit button. Latch action is preferred.
• Closing a panel of a subVI does not stop the subVI. It just closes the panel. If you stop the loop using a panel close event, your subVI will stop, same as with the quit button.

[altenbach]

See if something like this works for you:

Now you can even delete the "quit" control and have everybody use the [X] to kill the VI as any windows users already knows. 😄

(That's what I use. My programs typically don't have stop/quit, etc. buttons! If cleanup code is needed, use a "panel close?" event, discard it, and initialize the proper shutdown procedure.)