Using Open VI Reference to run a VI, on an RT target, with sub-VIs not loaded
I've been using Open VI Reference and Call By Reference Node to remotely run VIs on my RT controller. I
usually wire string data to the vi path input, but this
requires the VI to be in memory. I understand (from LabVIEW help) that I can wire a path to this terminal and specify a VI that is
not in memory, but is on the disk. NI has an example that
confirms my understanding. I get errors when I attempt to do the same
with VIs that have sub-VIs; I suspect that the problem is that
the sub-VIs aren't in memory and that the top-level vi doesn't know where to
look for them (because the paths aren't specified). All of the sub-VIs are on the RT system (in the same directory), they're just not in memory.
Is there a way to get LabVIEW to look for sub-VIs on the disk? I don't want to rely on using a startup application and rebooting to get my VIs into memory.
Thank you,
Jim Carmody
Software Engineer
G2 Technologies
www.g2tek.com
Jim
You're entirely bonkers. But I'll tell you a secret. All the best people are. ~ Alice
Hi Jim,
It sounds like you are going about calling VIs remotely the correct way. It would be very helpful if you could post the errors you are receiving. I also wanted to know if you saw the note at the bottom of the article that says your VI library must contain everything your top level VI calls.
Eric A.
National Instruments
Distributed I/O Product Support Engineer
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Attachments:
Detecting POP-UPS.zip 19 KB -
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"open vi reference" with run time menue
Hello,
I met some problems with "open vi reference" in labview.i can't parallel run this vi with the run time menue.i can't load the any vi then the run time menue has activation.(the "open vi reference" can run after the run time menue release.). it's means labview is serial running for this both function.but now i want to parallel running in the program.so would you give the some idear?Now I see what you are talking about. What you are trying to do is expected behavior. If you click on the menu while any state is running that doesn't lock the front panel, then the menu will halt the VI execution until you choose a menu item.
You should check the option in the event to "Lock front panel until event case for this event completes" Then you will not be able to click on the system menu until tthe VI is launched and running. If you wire a True like I suggested before, then you will fall out of the case pretty quickly in non-hoghlight mode, and the user most likely will not notice. If the VI you are trying to open is quite large, it will take a little bit of time for LV to load the VI into memory.
In highlight-mode, you just have to wait for the event to process before you select the menu.
Message Edited by Matthew Kelton on 12-03-2007 10:56 PM
Attachments:
edit events.png 27 KB -
Open VI Reference for a Project Library VI
Hi,
my code calls some subVIs by reference by using "Open VI Reference" and "Call by Reference" VIs. Now, "Open VI Reference" expects a path to the VI:
When the SubVIs sit in the same folder as the calling VI, it is easy to simply supply the name of the SubVI. However, I would like to call a SubVI that is part of a project library sitting somewhere else on the disk. I could give the relative path, but this make the code pretty inflexible and if the relative path changes all the paths would need to be ammended. Ideally, I want to utilize the fact that I am using a project library. The help for Open VI Reference states that
vi path accepts a string containing the name of the VI that you want to reference or a path to the VI that you want to reference. If you wire a name string, the string must match the full delimited name of a VI in memory on that target. If you wire a path, LabVIEW searches for a VI in memory that you previously loaded from that path on the same target.
I thought that the underlined path was my ticket and tried something like this:
but this did not work and I got
"Error 1004 occurred at Open VI Reference in MainVI.vi:
Possible reason(s):
LabVIEW: The VI is not in memory.
To load a VI into memory with the Open VI Reference function, a path must be wired for the VI Path input."
Wiring a path is not desirable as per reasoning above. Is there a way around the issue?
Thanks in advance!
Solved!
Go to Solution.tst wrote:
That should work, but you have to pay attention to something that's stated both in the help and in the error - if you use a string, the only way for LV to know what to access is if that something is already "in memory" (sometimes also referred to as "being loaded"). In the case of standard libraries, that means the VI itself or one of its callers has to be loaded. In the case of classes and XControls, loading the library (as in having it in an open project) should be enough to also load all of its members.
Hm, thanks, I am not advanced enough to know about classes and XControls, but I will check it out. My VIs are part of a library but obviously don't get loaded because, as you said, all their calls are dynamic.
tst wrote:
What I usually do is use a static reference to a VI to get its name, because that ensures that it will be statically linked, included in executables, etc. That might not work for you if you want dynamic loading and then you will need to use some other means.
Hm, this actually gives me an idea! I could add an enable input to all these dynamically called VIs so that the logic runs only when enable is ON; otherwise the VI is called but does nothing. Then I call the VI first statically with enable=OFF just to load it in memory and then proceed with my dynamic call. A little ad-hoc, but should work and serve my purposes, I think.
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How do I use a static reference to keep a VI in memory but then call it in parallel?
Hello all,
I have a MainVI and I want to call from it a SubVI in parallel so that I can have both windows open and responsive at the same time. The SubVI may be closed and reopened any number of times, but only one in existance at a time. I know how to do this using Open VI Reference, providing a relative path to my SubVI, checking its state to see if its already running, and if so bring the window to the front (using Front Panel: Open method with True/Standard inputs), and if not run it using the Invoke:Run method (and optionally opening its front panel programmatically). This method was working fine.
Now I have added functional global variables in my SubVI, and I want to keep them in memory inbetween opening the SubVI window. I can do this by putting a copy of the functional global in my MainVI, even though I don't use it there for anything. This works fine.
By accident, I have come across a reference to a Static VI Reference, which sounded like a vast improvement to my methodology, for the following reasons:
1) Keeps SubVI in memory all the time, eliminating the need to put the functional global in MainVI when it is not used there.
2) Tells LabVIEW to include SubVI when I build my executable, rather than me having to specifically mark it as Always Include in the build specification.
3) Eliminates the need to keep the path and SubVI name updated in a string constant in my code, in order to use the Open VI Reference.
However, trying to implement this solution, I have run into the problem that once you put a strictly-typed static VI reference (strict typing is required to keep it in memory) onto the block diagram, that VI is reserved for execution. That means I cannot run it using the Invoke:Run method. I haven't tried just putting it on the diagram directly as a subVI because I need it to run in parallel to the MainVI. I have searched through these forums extensively, and although there are several references to a static VI reference, none of them say explicitly how to actually run the darn thing! :-P
I very much appreciate any insight into my problem. If I have to go back to the old way it will work fine, but I really like the seeming elegance of this solution. I hope that it is technically feasible and I'm not misunderstanding something.
Thank you for your help,
-Joe
Solved!
Go to Solution.> If I understand you correctly, they can only really be used for re-entrant VIs.
No, a static VI reference can be used anywhere a regular VI reference (property nodes etc.) The reason for the hoop-jumping above is that we are really opening a reference to a CLONE (copy) of the VI identified by the static VI reference.
> Okay, I tried it, and got the code shown below... Any idea why it isn't working?
The VI you want to clone can't be on the diagram as a "normal" subVI. When you run your application you should be able to open that VI and see it just sitting there with a run arrow waiting to run. See attached example (LV2009SP1).
"share clones" vs "preallocate" has to do with whether you want each clone to preserve state (such as in an uninitialized shift register). Generally you use share clones. Occasionally it is useful to have multiple copies on a diagram that each remember some data, like "timestamp of last execution" in a shift register.
Other VIs in your spawned process don't have to be re-entrant unless they are functions that "wait forever". All the built-in G functions are re-entrant. It's pretty common to use a queue to feed data to a spawned process.
Spawning a process is more difficult than just running two parallel loops. It's useful because once you've made 1 copy, you can make 50. If you just want to do two things (vs n things) at once, I would just use two loops.
Attachments:
SpawnProcess.zip 20 KB -
Here is the problem:
I am opening a VI (we will call SubVI) through "Open VI Reference" and running the VI in parallel with the VI (MainVI) that I am opening it from. When I run the MainVI using "Run when Opened", I get a Error 1000 and the SubVI freezes. I break out using ctrl-period. Then I start it up from within LabVIEW and the Error 1000 does not appear. Does anyone have an idea of what is going on? Thanks.I'm a bit unclear as to what your setup is. I suggest you post an example which will help clear it.
As a guess, error 1000 means "The VI is not in a state compatible with this operation". If the subVI is the one set to be run when opened, maybe calling it dynamically is what causes the problem.
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