Dialog control stamp kills system Exec.vi!

Hello!

I have just a really strange behavior in my application. I managed to narrow it down to a much smaller VI, please don't look at the framework, but the real problem, this test of the vi MAIN looks like this because it's a skeleton of an application more great (I had to remove a lot of relevant and confidential parts).

So. I have a relay for monitoring USB from a 3rd party company that I use in my application via a supplied EXE perfectly. I call this exe in LabVIEW using the Exec.vi system and it works perfectly and watchdog functions as it should. However, I see a strange bug (?): if I run a browser control Time stamp dialog window, it "suspends" somehow the Exec.vi system. If my watchdog command stops setting, open relay, problem!

I compressed my test application, and I can reproduce this same problem, although I have just called a BREAK to gain control of command line. Note that, in my real application, the control of time stamp is in another, said dynamically (call and forget the method) VI, but I get the same bug!

Steps to reproduce the bug:

  1. launch my app
  2. observe that the iteration of the loop at the bottom
  3. Click browser control time to bring up the dialog window.
  4. You can see the background loop iteration has stopped (iterations of the loop DAQ)
  5. If you close the dialog box, the background loop continues execution

What the heck is this?

How this is possible, why there is "interference" between a completely separate control and a loop of low system Exec.vi?

Thanks for any suggestions!

I hide in my real application, as a solution, just the element browser control time stamp...

LabVIEW is a software component called root loop which is used by different parts of the LV. opening dialogue blocks the loop of the root, which is probably what is blocking the DLL called inside the exec system VI. Probably, you will be able to do as opening a menu and leaving open.

You can do a search for the term to learn more on this subject, but I don't think it's all you can really do about it.

Tags: NI Software

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