Event structure cases are not working (probably front panel is disabled

[moderator1983]

Please find the attached VI, I was trying to update and inlcude feature to a previously released code. And it ends up in a non-responsive event structure.

Is it a bug (related to setting 'Windows run transparently' property) or am I missing something...??

[mikeporter]

First, don't have two event structures on the same block diagram -- the second one isn't needed.

Second, for the key down event to work, the front panel can't be transparent.

Third, what is the timeout event for?

Mike...

[moderator1983]

Hi Mike,
Thanks for your reply, I'll check the code once I'll login from desktop. Your suggestions are correct, however I just wanted to know why the event cases aren't executing. As I already specified the intended value of timeout is 50ms, I kept it -1 just to have infinite timeout and the intension is to have emphasis only on the other two cases of event structure.

[RavensFan · Accepted solution]

You have your events set to lock the front panel until complete.  If you have a keydown event, the 2nd event structure captures it as well and locks the front panel.  You might think you have a timeout, but that loop doesn't get the timeout value until the first while loop completes.  Your second loop is dependent on the completion of the first loop.

If you don't hit the combination just right with a keydown event (or mouse leave or mouse enter and the other events that would lock the front panel) that also causes that first while loop to stop.  You've locked up your program.

As Mike said, don't have 2 event structures on a block diagram when you don't understand how event structures work.

I'd recommend reading Caveats and Recommendations when Using Events in LabVIEW.    That document has a few more items that I think it should mention.  But it is a good start.