Open front panel of sub vi when called - how?

Hello,
I have a VI with several sub VIs.
I want some of the sub VI front panels to be opened, if they are not yet opened and if they are called but I want them to stay in the background.
There are two SubVI Node setups: "Open Front Panel when loaded" and "show front panel when called"
Both are not what I want. If I select "show front panel when called", then the front panels are opened but flickering because they are called often and alternately.
Greetings Johannes
Using LabVIEW 7.1 and 2009 recently
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johanneshoer wrote:
No, no issue with my code :-)
Yeah, we've heard that one before...
@smercurio_fc: With your example I can see if a subVI is opened or not, but how can I open the subVI during run time if it is not opened
Just call the method with it set to "write" (right-click and select "Change to Write"). I don't recall if LV 7.0 has a Front Panelpen method. Check the LabVIEW manual.

Similar Messages

Show front panels of sub VIs when running a EXE (build application)

I've created a exe file and it works fine. However, it only shows the front panel of main VI and I can not open sub VIs (it looks like they are all hidden). I know it can be done by creating a library file along with this exe file, but that's not what I want. I want to create a single exe file that shows several front panels, and that can be run with run time engine. Is there any way to show front panels of sub VIs by running a exe file?

In the development mode, how are you displaying the front panels? Did you right click on the subVI and select SubVI Node Setup and choose 'Show Font Panel when called/Close afterwards if originallly closed' or did you choose the same options from VI Properties for each subVI. If the second, then the app builder will automatically retain the front panels of the subVI. If you chose the first option or if you are using VI Server to open a front panel, then the default setting in the app builder is to remove the front panels. You would then have to go the VI Setting tab in app builder and edit the settings.

SubVI does not open (error 3 could not open front panel)

For the VI I am working in (trail version of Labview 2011), I have created a subVI. At one time I opened this subVI to adjust the connection terminals -which I have done before- and after saving the file and closing it, the subVI remained unadjusted. In fact, I am not able to open the subVI anymore. And when I want to open the file as a VI (e.g. executing the VI in windows), I receive 'load error code 3: could not open front panel.'
I also cannot preform any tasks such as saving the main program for an older version, because this subVI is present in the program.
Nevertheless, the VI still works as a subVI in the mainprogram I've written -in the way it worked before I adjusted the connection terminals.
Is there any way to resolve my problem, without rewriting the whole subVI? The subVI concerning is attached in this post.
Thank in advance,
ps. after closing Labview, it sends an internal warning report.
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Attachments:
ampweightcenter.vi ‏25 KB

Hello Stag,
My name is David and I am an Applications Engineer at National Instruments UK.
To clarify the problem, when you receive this error are you trying to run the VI as an executable, standalone file in Windows? If this is the case then I think that I know what the problem could be. When using the Application Builder the Front Panels of SubVI's are removed to reduce file size. It is possible to include them so that they may open and the steps to doing so are listed in the attached link:
http://digital.ni.com/public.nsf/allkb/8F68715444302CAB86256DDD0071C140?OpenDocument
This link explains why you are receiving this error and how to overcome it.
I hope that this helps you and do not hesitate to contact me if you require more assistance.
Regards
David B
Applications Engineer
National Instruments UK

Can not open front panel sub VI when running an application VI.

When I create an application of my program a problem occurs. When I select options (press a button or so) from the main front panel that should result in a popup menu (sub VI cal) LabVIEW indicates that something is happening but the front panel does not open. The mouse indicator changes to the time glass so LabVIEW is doing something but the window of the sub VI does not open.
The problem has the same characteristics on several places. There are some sub VI front panels that opens but I ca not find the reason for why these open and not other.

Hi
there are three ways trhough which you can force a subVI to show its front panel
1. open the perticular SUB VI
click File->VI properties select window appearence catagory.
click customize button and select "Show Front Panel when called" and "close afterwads if originally closed" check boxes
save the VI
whenever you use this Sub VI every time it will pop up front panel
2. dont perform the changes suggested in option 1. place the instance of subVI in your main application and if you want that instance to popup a front panel then right click on subVI and Select "SubVI Node Setup" again select "Show Front Panel when called" and "close afterwads if originally closed" check boxes
with this option only certain instances of SUB VI will cause pop up to occur
3. this is the most flexible option. use invoke node to show front panel. in invoke node select show front panel method to popup the VI and use close front panel method to close the pop up window.
Tushar Jambhekar
[email protected]
Jambhekar Automation Solutions
LabVIEW Consultancy, LabVIEW Training
Rent a LabVIEW Developer, My Blog

VI front panel won't close when it's done executing, when this vi was called by reference.

I've created a simple vi set to demonstrate the issue I'm having. I'm dynamically launching sub vi's from a main application. Simply put the main application is my test exec and the subvi's I'm calling dynamically are different tests. In the example I'm posting here the test vi is called Electrical Test 1.vi. I've configured this Electrical Test 1.vi to show front panel when called and close afterwards if originally closed. Problem is it won't close the front.
Other things to keep in mind
I want to be able to launch the test vi and not wait till it's done.
I'm using LabVIEW 2012 SP1.
Solved!
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Attachments:
vi_launcher - v5.zip ‏73 KB

Basically the close after call only matters if the VI is called as a subVI (just like if you open a VI yourself and run it, it doesn't close when it is done). The two ways around this are to either have your top lvl app close the VI when it is done, this is explained here:
http://digital.ni.com/public.nsf/allkb/987B2026B41BD39786256CF800032E8C
or to have your VI close itself when it is done. Use a This VI reference and the Front Panel:Close invoke node.
Hope this helps.

Problem : controls & indicators not updated when programatically open Front Panel

Hi,
I have a strange problem when I want to progamatically open the front panel of a sub-vi: for some sub-vis the controls and indicatores are correctly updated while for others they are not (ie the controls show outdated values).
I have created an example here that illustrate this. The 2 sub-vis are *exactly* the same, but only one shows updated controls when I open it (with the sub-vi previously closed of course).
How is that possible?
What do I have to do to have the controls updated to the last value of the *last call* when I open the sub-vi?
Solved!
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Attachments:
Front panel problem.zip ‏35 KB

titi_nicolas wrote:
mhmmm,....no that is NOT the reason... Have you tried the VI???
Honnestly, I would not bother people on this forum for such a stupid mistake.
And I also expect people to know how to run a VI....
And to play in your game, you forgot -3) Turn on the PC, -2) log in windows, -1) open labview...
Well, I DID run your VI and everything worked just fine, however I no longer have LabVIEW 7.1 so maybe your observation no longer applies to newer versions. It could also be because they were just upgraded as Ben noted. I did not study it in detail.
And Yes, as Ben noted, invisible VIs don't get updated for performance reasons (and not to waste extra data copies for the controls and indicators). LabVIEW is typically smart enought to update when needed, e.g. if the subVI tries to print its panel, etc.
I guess you haven't been in this forum for too long, but since controls can easily be operated in edit mode is is absolutely important to mention at which step you run the VI. (try to operate your controls with the computer turned off and you will see that it is not that easy ). Also if you have been programming for any length of time, you should know that stupid mistakes happen all the time (at least to me and Ben ). It is much easier to weed out the stupid mistakes with a quick question&answer than to spend hours searching for a deep and complex solution.
LabVIEW Champion . Do more with less code and in less time .

Button Function Problem When Showing Front Panel of Sub VI

Good Afternoon,
I have a created a simplified version of a much more complicated vi to illustrate the problem I am having. Attached is a main vi and a sub vi. The main vi has a boolean which says to open or close the front panel of the sub-vi. This works great. However, the other push button ( " My Button Function" ) on the main vi does not work properly when the sub-vi front panel is being displayed. It is supposed to be a "switch until released" button. However, if you try to click and hold it down while the sub-vi panel is displayed it acts as if I am clicking the button rather than being able to hold it down? I was wondering why showing the sub-vi front panel makes this happen? And also, if anyone has any recommendations to fixing this problem?
Attachments:
main.vi ‏12 KB
sub.vi ‏5 KB

What is happening is the loop is running very fast. It is constantly reading the open SubVI button and opening the subVI if true, even if the subVI front panel is already open. If you are trying to hold down the other button, the opening of the subVI front panel is taking away the focus from the main VI and thus acting like you let up on the button.
Maintain the status of the subVI in a shift register and only open or close it if the status changes. See attached Main VI.
Attachments:
main.vi ‏12 KB

How to open front panel of a VI running in RT.

Hi,
I have an application to read the encoder position using the cRIO program. I have made an executable and this application runs as startup application whenever the controller reboots. Right now, i am accessing the VI of the startup exe through Remote Panel connection. This works fine but everytime i close the remote panel , i have to reboot the controller for the next view.
So is there any alterntaive to open the front panel of the VI.
I tried using VIServer but ran into errors. (i tried using front panel -open property node.did not work)
Also i do not have any VIs stored on the controller. Only the exe is stored on the ni-rt/startup folder on the RT controller.
Please let me know how to open this VI.
Thanks.

Hi Ben,
When i close the remote front panel the first time, i am terminating the RT VI which is running on startup.
So i had to reboot everytime to access the remote VI. I guess that the VI (exe) should be continuosly running when the RT is started up. The remote panel only should be opened and closed. After I close the remote panel , i want a windows VI to be opened up.
I have a Windows VI which programmatically opens connection to the RT server for opening the remote panel. The VI runs. When the user clicks Exit on this RT VI, the VI running is stopped and then another windows VI opens up. This works fine for first time. Since the RT VI is terminated, second time , if I run, it says, VI not in server memory.
Is there a method to close the remote panel programmatically in the RT VI itself. I have a Exit button in this RT VI, so if the user clicks, Exit, the program has to be running, but the remote panel has to close. There is a method called close connection to client , but this does not work in RT , as this requires VI path.. Right now , when the remote panel RT VI is launced, to close the remote panel, i click on the 'close' button on the VI title bar. Again when the remote panel is launched, there is no error. but is there a method to close the remote panel in the server(RT VI itself). i have attached the VI.
Thank you.
Attachments:
Dummytest.vi ‏39 KB

How can i open front panel of a vi and run it

Hi
I have a vi that i call multiple times from another vi, however i want it to open the front panel on some calls and not on others. What is the best way to do this?
I have come up with a way and was wondering if this method was okay or is there another method that might work better escepcially since i am eventually going to create an application out of it and hope that no problems pop up then
Unititled 1 calls Untitled 2 where with one call it opens and runs Untitled 2 while with the other call it simply runs untitled 2.vi
What I did was i changed untitled 2.vi window appearance to dialog but i deselected the show front panel when called, so by simply calling the subvi form untitled 1 it works. Unititled 2 runs but does not open
Now with another call i want to open and run untitled 2.vi so by looking the attached vi you can see what i have done
Again if there is a better method that would make my vi's more efficient i would greatly appreciate it.
Reza Sed
Attachments:
Untitled 1.vi ‏24 KB
Untitled 2.vi ‏10 KB

What you did, in theory, is the correct way to do it. However, you should move the front panel open and close into Untitled2.vi and have a boolean input as to whether to show the front panel or not. This way, your calling code is cleaner, and you don't have to reproduce the code everytime you want to call the subVI and show the panel.
If you were to use Untitled2 in another project, then you woud have to go back and look how to implement the showing of the front panel in your other code. If later, you were to decide you want that VI to be maximized, then you make one change in the VI, and not in every place you ever call it showing the front panel.

Publishing VI's on the Internet without open front panels

I'm using LabVIEW 6.02 and are publishing VI's on the Internet. I'm wondering if it is possible to publish VI's without having the front panels open when you are running the program?Or do they have to be open to be in memory and to be able to get updated front panels?
(I use the .snap command so it is possible to refresh and get updated VI panels.)
I also wondering if the only difference between .snap and .monitor command is that you can use the refresh command with monitor so the labVIEW display will automatic updated itself. This is not possible with the .snap command?
Thanksregards Anne

I've never tried to exactly what you are talking about but a similar issue comes up when printing. A front panel normally won't update unless it's open. The way to insure that it does is to have at least one property node on the routine's block diagram. When LV sees the property node, it goes ahead and updates the front panel even when it's closed.
Hope this helps...
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

Close top vi front panel while sub vi front panel run

Hello,
I'm writing wiring a program and have several (several several several .. ) VI which launches Sub-VI with their front panel.
During there Sub VI, the Front Panel of the Top-VI get bored behind...
Is it possible to Hide this Front Panel while the sub-VI is running.
Thanks
Solved!
Go to Solution.

Sorry for this post, i didn't read every replies of the folowing topic :
http://forums.ni.com/t5/LabVIEW/closing-front-panel/m-p/300115
The VI of falkpl :HideFPvi.vi 24 KB is a very good method for my VI.
Sorry again, hope this'll help someone

Dynamically opened front panel won't work in executable

I am dynamically opening the front panel of a VI from the top level VI. After I build an executable, this does not work anymore.
Any ideas?
Scientia est potentia!

See the marked solutions in these threads.
http://forums.ni.com/ni/board/message?board.id=170&thread.id=402041
http://forums.ni.com/ni/board/message?board.id=170&message.id=400907&query.id=212194#M400907
Message Edited by elset191 on 07-23-2009 03:38 PM
Tim Elsey
LabVIEW 2010, 2012
Certified LabVIEW Architect

No front panel audio or mic when hooked up through xtremegamer

> I have my HAF 922 front panel hooked up to my xtremegamer with the intel HD audio 2x5pin connector. It doesn't recognize any headphones or mic i plug in and doesn't play audio through anything. I've double checked the connection on the card and have disabled onboard sound in the bios. Is there some setting im missing?
Thanks in advance,
Keith

bump

Can't close CVI panels in DLL-Detach when called from Teststand

Hello,
i've got a problem with Teststand calling a DLL produced with CVI.
1. I use to DLL Attach and Detach calls to load or discard the panels. The attach part works fine, but when the TS sequence ends and i try to unload the module, the "DiscardPanel" function returns a error -129 "operation can only be performed in the thread it was created".
If i call the same dll from a CVI executable, this doesn't happen.
2. Additionally, the first time i run the sequence file the panel doesn't correctly quit and return to Teststand, so the whole thing hangs.
Does anybody have an idea, what is going wrong?
See attached files:
ErrorOnDllDetach.seq --> Call DLL from TS
\bin\usePanelsDll_dbg.exe --> Call DLL
from CVI
Attachments:
NoUnloadOfDll.zip ‏326 KB

Maik -
After some more investigation, because of limitations in Microsoft's operating system, developers and CVI are limited in what they can do in DLLMain. Basically load and unload CVI panels in DLLMain just does not work well if the DLL is loaded and unloaded arbitrarily like it is in TestStand.
One option is to never unload the panels and let CVI and the OS clean up the panels when the process terminates. You can do this by adding an extra reference to your DLL using LoadModule. You would basically prevent TestStand from unloading the DLL, so any dialog would stay around for as long as you like.
The best way to have the dialog go away when TestStand is no longer using it is to associate your dial
og lifetime with the execution that is displaying it. You load the panel either when the first call is made into the DLL or by an explicit call to a "Display" function exported from the DLL. Then have the dialog monitor for when the execution is terminated or stopped. This works because TestStand does not attempt to unload the DLL until the execution that is using it completes.
I have attached an example DLL and sequence that does just this. It uses a default pool thread to display a panel and that thread waits for either an explicit call to a "Discard" function exported from the DLL or or if the execution stops.
Hope this helps...
Scott Richardson (NI)
Scott Richardson
National Instruments
Attachments:
DLLProject.zip ‏344 KB

How to run a subVI without poping up normally, but when clicking a button, popup the front panel?

I know pop-up the front panel of a subVi when called by selecting VI Properties>>Windows apperence.
But what I need to do is: always run the SubVI inside the parent VI as the nornal subVI do without poping up. But when I click a button"show front panel", the SubVI popup the front panel.
Is there anyway to do this?
Thanks,

ossoo,
You can use a static VI reference to the subVI and then use the Front Panel Open invoke method to show the front panel when you want. I have attached two VIs that show this. I saved these VIs for LabVIEW 2009 so you should be able to open them up and run them in 2009 or later. Add.VI is the subVI that you are calling. The Caller.VI is just a While Loop that contiually calls the Add subVI. Inside of the While Loop is also a Case Structure with a Static VI Reference (you might need to change the path this is pointing to after downloading the VIs to your computer for this to work) and the Front Panel Open invoke method. You can run the Caller.VI and interact with the main Front Panel as normal and see the subVI but then you can click the Open subVI? boolean button and it will open the subVI's front panel. You can continue to interact with the main front panel and see the values update on the subVI's front panel as well. You can just close the subVI's front panel when you are done viewing it. Does this help?
Grant H.
National Instruments
LabVIEW Product Marketing Manager
Attachments:
Caller.vi ‏19 KB
Add.vi ‏23 KB

Open front panel of sub vi when called - how?

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