topic Re: Proper Method for closing a VI? in LabVIEW

Proper Method for closing a VI?

Valcon — Mon, 16 Apr 2007 17:10:53 GMT

Hi there,
I am a very inexperienced labview user, so this question may be a walk in the park for you pros. What is the proper method for closing a VI? I want a particular VI to close upon a certain occurence. When I use a property node to close the front panel, then an invoke node to abort the VI with a static reference. I sometimes get a message dialog in the upper left corner of the screen that says "Resetting VI: [Vi's name].vi" at which point labview freezes, and must be closed externally from the Windows task manager. I know that using the "abort" can leave certain references open, so I close these references upon completion of every cycle... What is the proper method of closing a VI?
Thanks a bunch,
Ryan

Re: Proper Method for closing a VI?

Jorge_Amaral — Mon, 16 Apr 2007 17:15:53 GMT

Hello,

Why don't you use the "quit labview"?

Re: Proper Method for closing a VI?

Jorge_Amaral — Mon, 16 Apr 2007 17:17:45 GMT

Hello,

I've forget to attach a picture that help you indentify the function.

Re: Proper Method for closing a VI?

Joe_H — Mon, 16 Apr 2007 17:24:57 GMT

If he is calling the VI from another VI then the quit LV will shutdown everything including the main VI.

Please post what you have already tried.

Re: Proper Method for closing a VI?

Ching_F. — Tue, 17 Apr 2007 15:42:38 GMT

Hi Ryan,

The correct method for closing your VI is dependent on how you have chosen to open it. Like Jhoskins, I think the LabVIEW community will better be able to assist you if you post what you've already tried.

If you have tried to dynamically load your VI using a Call by Reference Node, you will need to use an Open VI Reference and a Close Reference. Please take a look at the Dynamic Load Example from the NI Example Finder. You can find this by searching for VI Server in the Example Finder.

I have attached a figure that shows this Open, Run, Close paradigm in the Dynamic Load Example.

Message Edited by cphuong on 04-17-2007 10:43 AM

Re: Proper Method for closing a VI?

Valcon — Wed, 18 Apr 2007 19:38:50 GMT

Thanks for your helpful advice.
I couldn't use the "Exit LabView" VI because I only wanted a particular VI in the application to shutdown on a particular occurence, but I have used that VI before as applications "END" feature, and it works pretty well. In the end, I ended up doing something that I think is pretty sloppy but works... I made a static reference to the particular VI who's closing event would be the trigger, and I bascially wired it so that if the front panel of this partcular VI was closed, then the dependant VI should close it's front panel and abort as well. I know it's sloppy, but it works well and consistenly; this makes me happy. Ha ha! really though, I always get good advice on this forum and I do appreciate it.
Ryan