Frontpanel opened by Invoke Node blocks other FP

Hello,
In a project I am working on I would like to open and close a frontpanel displaying a few plots from a different VI. I have managed to create the Visualisation VI and am passing references to the Indicators and the VI itself on to the next block. I can open the FP by using an Invoke Node on the VI ref, but then I can only interact with the newly opened VI. To get back I have to close it by hitting X, I would prefer it if I could just have it running in the background or minimized once I click on my "main" Vi again. I have attached the required VIs.
Solved!
Go to Solution.
Attachments:
FP_Open_plots.zip ‏63 KB

Hi,
I can't see your code as I haven't upgraded to 2014 yet (shame on me ). Here is a Main VI that opens a Graph VI in two ways:
1. Without running it, just by FP.Open. The main VI remains responsive. This is not really recommended but I think it was what you meant to do.
2. (enable disabled diagram): by running the VI using the Run VI invoke node. In this way the Graph VI is called dynamically and the Main VI doesn't wait until it's done to continue.
Good luck,
Danielle
"Wisdom comes from experience. Experience is often a result of lack of wisdom.”
― Terry Pratchett
Attachments:
Main VI.vi ‏11 KB
Graph VI.vi ‏33 KB

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"Error 7 occurred at Invoke Node..." when attempting to open .vi for editing

I am attempting to open a vi for editing, and instead the vi is attempting to execute. I get the error:
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Hi R.Jay,
Error 7 generally occurs when trying to create an executable when there is an extra instance of a top-level vi. You may need to remove the file as a support file (but leave it as the top level vi).
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VI loaded with either Invoke Node or Call by Reference only functions properly when it is already open

I have modified the Dynamic Loading example so that my case for the first button loads three VIs in succession, rather than one. The first VI generates a waveform, the second uses this waveform to calibrate the measurement, and the last VI stops the waveform generation. I discovered that the middle Calibrate.vi would only function properly if the Calibrate.vi was already open. I attempted the VI loading of the Calibrate.vi with both the Call by Reference (identical to the example) and the Invoke Node method. In both cases, the first and last VIs (Multitone Gen.vi and Stop Gen.vi) functioned properly, but the Calibrate.vi only worked correctly when it was already open.
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Attachments:
Call by Reference.png ‏19 KB
Invoked Node.png ‏21 KB

Hello Anjelica,
I do not receive any error messages when the middle VI is loaded and run.
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Though it is an obvious workaround, I can live with opening the Calibrate.vi via the Open VI Reference method outside of the while loop. This will be my solution for now.
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Attachments:
Open Outside Loop.png ‏23 KB

I am using the NI application note "Calling IVI-COM drivers from LabVIEW" I created an Automation Open and an Invoke Node, after wiring

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the 2, the AN asked to right click the Invoke Node(this is step9) and choose initialize. However there is no intialize option on the pop up menu. Anything am I doing wrong? I am using Labview6 and I did add the "enableCustomInterface=True" in the INI-fileT Tall,
What's the number of the application note "Calling IVI-COM drivers from LabVIEW"? I'm unable to find what you're looking at.
Thanks,
--Bankim

Error 1003 occurred at Invoke Node

Good morning.
I work with LW8.5 and created with the following architecture:
There is main.vi on the links at the user's calls and runs the other VI.
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In the development of a happening in normal mode, all dynamically called VI,
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Error 1003 occurred at Invoke Node in Main.vi
Possible reason (s):
LabVIEW: The VI is not executable. Most likely the VI is broken or one of its subVIs cannot be located. Open the VI in LabVIEW using File>> Open and verify that it is runnable.
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Show you how to act?
Thank you.

Hello margasan.
In my Projects I use to pass more dynamic and VI classes.
In the attached file - an example of my project:
In the main folder is a folder UpperClass, it is the parent class and child classes and HeirClass.lvclass Heir2Class.lvclass are organized into folders respectively Plugin1 and Plugin2, and these Classes inherit from the parent one and the same WI - UpperClassTest.vi. Plus, this Plugin1 has two, independent from the others, but related classes. A block diagram for an object placed Core.vi UpperClass.
So, here, if you take EXE, making llb files and run them from start VI for each of the Plugin, then everything works OK.
But as soon as I on the block diagram of a Plugin will put any object UpperClass, or one of its nasalednikov, there arises a familiar ERROR 1003. Prompt, plc, margasan I get rid of it in this case?
Attachments:
Example.zip ‏1481 KB

Does "Run VI" invoke node work on strict references to REENTRANT VIs?

I am using LV 6.02 on Windows 2000.
I am trying to use the "Run VI" invoke node method with a reference to a Reentrant VI, with no success. (It works when VI is not reentrant. Perhaps there is a reason this cannot work. But if not, I wonder if there is a workaround, or if LabVIEW 6.1 has a fix?
Hopefully the picture of the block diagram I included is sufficient...but I also included the actual code just in case.
Thanks!
Steve
Attachments:
block_diagram.jpg ‏66 KB
Parent_VI_Example.vi ‏43 KB
Prototype_subVI_shell_for_Simplex_Fit.vi ‏40 KB

Hi, Labviewguru,
Thanks for taking the time to look at my admittedly messy (flawed) block diagram. I will try to state my ultimate goal:
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What I was thinking of doing is instead passing Target Func and Deriv a reference to the VI which would perform the calculations. This would allow me to use the same fitting code to fit different types of data with substantially different methods--without modifyin
g the low-level fitting code at all.
I'm not sure this is going to make any sense to you, but thanks again for your help.
In regards to your answer above, let me clarify somewhat. I had the call by reference node in there to prove that the reference to the VI was "good" and worked fine...this same reference was passed to the invoke node, which didn't have any apparent effect.
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Thanks,
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Run VI Invoke Node: VI works, EXE doesn't?

This is LV2009 with no patches or updates. I am calling buffer.vi by static reference with an invoke node set to Run VI. I don't have an incredibly good reason for doing this, but just don't want that code on the block diagram. I hate to put alot of effort into this since I can just drop the code on the main diagram and I'm sure it will work, but I don't understand why it gives me the error 1000: VI not in a state compatible with this operation?
In the EXE, when I check the execution state of the buffer.vi before I tell it to run, it comes up bad. Same code in the VI, comes up idle. I also tried replacing the static VI reference with an open VI reference using the name of the buffer and received the same error. I have the buffer VI included in the build under always included.
Solved!
Go to Solution.

"You did not compile the vi to be in the EXE, did you?"
I'm not sure what you mean. I have included buffer.vi and all of its sub VIs in the build as Always Included. I am investigating creating a source distribution. Never done that before. I will let you know if it works.
I attached snippets of the caller and buffer.vi itself. I was playing around with the caller, trying to abort if running and such...
Edit: Sorry if its confusing, what I'm calling buffer.vi is actually Waveform FIFO AE.vi
Message Edited by deskpilot on 04-08-2010 09:04 AM
Attachments:
Remote Call.png ‏34 KB
Buffer.png ‏42 KB

Error 1069 on Invoke Node

Hello all,
I'm trying to build an application we have. In one of the sub-vi's there's a call to invoke node to start another vi. When I run the program from the VI this works fine as it should. When I build my executable and have my .llb for the executable, the program gets to this point and I get the above error, Error 1069: The sub vi is not executable. I know there's no executable for this and the spawn vi that calls it is in the llb. Any ideas as to why it will work as a vi but not as an exe? Thanks for any help.
Gary

Aaron G wrote:
Gary,
A common reason for error 1069 is because you are attempting to launch the code from the executable environment and not a develoment environment. When it attempts to launch the VI, it may not find all of the subVIs, causing the VI to be reported as non-executable. One way around this is to open the VI that is dynamically launched, go to File>>Save With Options and choose Application Distribution. This will allow you to create an Application Distribution LLB file. If your executable launches the version of the VI that is in the Application Distribution LLB, it will work. As a word of caution, when saving files as an Application Distribution, the block diagrams are removed from the VIs, DO NOT OVERWRITE your existing VIs. You will never be able to edit them again if you do this. Alternatively, when you build the application, make sure that the VI is included as a dynamically launched VI in the list of included files.
Regards,
Aaron
Aaron, thanks for the reply. I am saving with options and doing the Application Distribution. I'm also getting error 1003 but it's still saying the possible cause may be that the vi is not executable. The vi's that the invoke fails on are not included in the llb but according to the previous version of the software (in LV 6.1) it's not needed. (I checked the old llb file and the options in application builder.) I have the spawn vi which calls the invoke in the llb. The spawn takes a path, creates a reference and then does the invoke on this path. The vi's themselves are not in the llb. Will these need to be moved in? And if so will the paths need to be changed?

ActiveX Object Creation method to pass to an Invoke Node

Hi!
I'm trying to optimize the way in which I use MathCAD from LabVIEW. One of my VIs is having really poor performance in terms of execution speed and memory usage.
My VI converts a 2D LabVIEW array of doubles into a 2d Mathcad matrix and puts that matrix into a Mathcad worksheet. The issue is that you do not just pass the 2d array of doubles into the SetValue invoke node as a variant. You have to create a Mathcad.MatrixValue object, and then pass the object to the SetValue invoke node.
Here is the example code provided in the Mathcad developers manual:
SetElement Method
var m = CreateObject("Mathcad.MatrixValue");
for(row = 49; row >=
0; --row)
for(col = 9; col >= 0;
--col)
var val = row + col;
m.SetElement(row, col, val);
Here is my implimentation in LabVIEW:
Here is my SubVI
Here is my main VI:
My SubVI is running out of memory and throwing the following error:
Exception occured in mplrun: Exception of type 'System.OutOfMemoryException' was thrown. in NL SubVIs Library.lvlib:Convert LabVIEW 2d Array to MathCAD Variant Matrix (SubVI).vi->test.vi
It doesn't always throw the error. When I watch the memory consumption of LabVIEW it goes up to about 250k and then drops to 90k and slowly builds back up to 250k. Initialy starting the code takes awhile too on my computer. From start of VI until first loop iteration it is about 20 seconds, and then about 150-250ms after that. Not very good performance.
Any advice on how to optimize this code would be appreciated. I'm not really sure when I should close some of these references. I tried closing the reference in my converting SubVI, but I guess that destroys it so MathCAD can't use it.
I'm in LabVIEW 2009. Any help is appreciated.
Thanks for your time and input!
-Nic

I'm not sure this will solve your problems but it should help. You need to close ALL of your references to Mathcad objects when you're done using them. That means you need to close the reference to the Mathcad MatrixValue after you pass it to Mathcad (to do this you'll need to convert it back from a variant, or pass the reference directly out of your subVI), and you should also close the reference to the matrix that you get back after you've converted it to a LabVIEW array. Otherwise you'll continuously allocate more and more memory rather than allowing it to be reused.
Less importantly, you should also close your references to IMathcadWorksheets and IMathcadWorksheet (but since you only open them once it's not causing your memory problems).

Error 8 occurred at Invoke Node in AB_EXE.lvclass:Build.vi- AB_Engine_Build.vi- AB_Build_Invoke.vi- AB_Build_Invoke.vi.ProxyCaller

Hi there,
Hope someone can help me. I recently upgraded to LV 8.5 and am having a problem building a .exe which has a subvi in it that opens in a new dialog window. When I try to build this I get the following error:
Error 8 occurred at Invoke Node in AB_EXE.lvclass:Build.vi->AB_Engine_Build.vi->AB_Build_Invoke.vi->AB_Build_Invoke.vi.ProxyCaller
Possible reason(s):
LabVIEW: File permission error. You do not have the correct permissions for the file.
=========================
NI-488: DMA hardware error detected.
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I have built the .exe with the same subVi but without opening it in a dialog window and it works fine., so the problem seems to be linked to the inclusion of the dialog window.
Any advice greatly appreciated
Regards
Tadhg

UPDATe: I can get the .exe to build but now I get an error when I run teh .exe which is shown in the picture attached.
Attachments:
error screen1.JPG ‏122 KB

Error 8 occurred at Invoke Node in AB_EXE.lvclass:Build.vi- AB_Build.lvclass:Bui

During software build to make exe file, I got the following error message:
Error 8 occurred at Invoke Node in AB_EXE.lvclass:Build.vi->AB_Build.lvclass:Build_from_Wizard.vi->AB_UI_FRAMEWORK.vi->AB_Item_OnDoProperties.vi->AB_Item_OnDoProperties.vi.ProxyCaller
Possible reason(s):
LabVIEW: File permission error. You do not have the correct permissions for the file.
=========================
NI-488: DMA hardware error detected.
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I am using LabVIEW 2014 and have been getting this error randomly, but fairly consistently on a recent build. I searched all over and could not find a solution that worked. However, just through trial and error I discovered that the problem is related to SSE2 Optimization in the Advanced properties window. I can consistently cause this error by enabling this feature and consistently compile successfully when it is disabled. Try turning this feature off and see if it solves the problem.
...UPDATE: After closing and re-opening LabVIEW this error came back, and did not seem to be affected by the SSE2 option. Not that it isn't related, but perhaps not the silver bullet I thought it was.
I also got the error to go away sometimes when I compiled the EXE while the main program VI was open, whereas it gave the error most of the time when no VIs were open...again, nothing seems to consistently solve the problem...there is definitely some kind of bug in the appllication builder, and it seems like there are a lot of people that have been struggling with this for a long time (as far back as LV 8)...hopefully NI eventually finds this bug and squashes it!..although, I doubt that anybody at NI is even looking for it...

How to get a LabVIEW class object to expose an invoke-node method?

Hi,
      I like the property/invoke-node "paradigm" used for interacting with "objects". Can LabVIEW-class objects expose their properties and methods this way? Can one or more LabVIEW-class objects be compiled into a library or "assembly" (or other distrubution format) that allows the property/invoke-node usage?
I've looked at (but not completely understood) "Creating LabVIEW Classes". Have also searched for related posts.
The pic below shows an invoke node wired to a class with a Public VI "VAT.Status.Hello.vi". I'd like to see VAT.Status.Hello show-up as a Method. (I just tried "Select Method", and selected "VAT.Status.Hello.vi" but dialog's "OK" button stays greyed-out.)
Cheers.
Message Edited by tbd on 03-29-2007 03:15 PM
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)
Attachments:
VATStat.JPG ‏54 KB

Hi Aristos,
      Thanks for the reply!  It was a bit dissappointing, though.
It appears the LabVIEW-class object will be moving away from (what seems to me) a convenient object-interface presented by the invoke-node/method paradigm - which allows us to interface with a large set of "objects" (.NET, ActiveX, LabVIEW GUI, VISA Resource, ?) in a similar manner and independent of the object's origin. Being able to read the methods and parameters that appear in these nodes is also helpful for understanding diagram logic!
I do like the option of dropping a friendly "VI looking" icon on the diagram, but perhaps an optional - even default - VI-icon representation for a class-object invoke-node is feasible - so the LabVIEW class-object could be the more generic object first, but with a traditional-G representation(?)
Given the answer "We would like, someday, to support the property node"
and "in the next version of LV, wiring the LV class to the property/invoke nodes will break the wire so we'll avoid confusion in the future",
... I guess you'll break the wire in the next version, but (perhaps) allow it again - if support of the property node is ever implemented?
Regards.
P.S. For the record, huge THANKS to whoever it was that straightened-out enumerated-types (somewhere) between LV4.1 and LV6.1.  Every time I add or remove an enumeration in a typedef, I silently give thanks to the bright and thoughtful soul(s) who made this valuable tool work so well!
Hello. This is your friendly neighborhood R&D guy for LabVIEW classes.
Regarding your request about property and invoke nodes as relates to LV classes....
Short story: We would like, someday, to support the property node. We have no intention of ever supporting the invoke node.
Long story: As we were creating LV classes, we had to evaluate the right programming interface for these things. We wanted LV classes to behave as new data types in LV. A developer should be able to create a LV class, then give it to someone who doesn't even know OO programming, and that second programmer could use the new data type without learning a lot of new concepts. From this principle, we held fast to the idea that the programming interface should be subVI calls whereever possible. The invoke node is really nothing more than a VI minus the icon. If you want, you can popup on any subvi node and uncheck the option "View as Icon". This will make the node display in a way that has the terminals listed as text, like the invoke node. So, at the end of the day, the invoke node is simply a subroutine call in LV that is language dependent, as opposed to the language independent iconography of LV generally.
The property node is a slightly different story -- the functionality of a property node is actually different than an invoke node as its terminals are various subsets of the properties available, not a fixed list of parameters like the invoke node. The property node provides a nice interface for setting multiple properties in a block and only having to check a single error return. Very friendly. Our intent is to allow you to create a VI that has 5 terminals: object in, object out, error in, error out, and either a single input or a single output of your chosen type. VIs with this conpane could be marked as "properties" of the class and would show up when you wire the class wire to the property node. We would call the subVIs behind the scenes as needed to get/set the properties.
This is on the longer term roadmap because it is "syntactic sugar" -- it sweetens the programming style, but it is not necessary to program effectively. You can get the same effect by writing those same VIs and stringing them along on a block diagram "railroad track" style. We'll probably get around to it in three or four versions of LV -- there are some major user requests that impact functionality that have to get done first.
PS -- in the next version of LV, wiring the LV class to the property/invoke nodes will break the wire so we'll avoid confusion in the future of people thinking there's a way to use these nodes.
Message Edited by Aristos Queue on 04-02-2007 09:56 AM
Message Edited by tbd on 04-03-2007 12:39 PM
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)

LabVIEW Application throws Error in Run VI Invoke node

Hi All,
We are facing an issue with an application developed from LabVIEW 2010SP1.
Application Description:
In our application, there is a top level VI which tries to run VIs dynamically[using Run VI invoke node] from a particular folder. This folder is like a plugin - not part of Exe. This implies when the top level VI is launched, the plugin VIs under particular folder will not be in memory. When we try to run a VI dynamically from the top level VI, the VI execution works perfectly in LabVIEW development mode.
Problem Faced:
When we created an EXE, it worked well in my PC [LabVIEW is installed]. We created an installer and tested in few other PCs.
[Non LabVIEW PCs – Win XP and 7]. In few PCs it throws the following error, when the plugin VI is run dynamically.
Error 1003 occurred at Invoke Node
Possible reason(s):
LabVIEW: The VI is not executable. Most likely the VI is broken or one of its subVIs cannot be located. Select File>>Open to open the VI and then verify that you are able to run it.
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We tried the following possible ways to find the reason for the issue:
1. Installed LabVIEW - Issue got fixed.
2. Installed .net 2.0 without installing LabVIEW - Issue got fixed.
3. But in one of the Windows 7 [Non - LabVIEW PC] in which .net was already installed, we faced the same error.
Only after installing LabVIEW the error got fixed.
4. When .net 2.0 is uninstalled the EXE itself is broken.
We are not sure what is the Exact reason fo the issue. Anyone faced these kind of issues? Please share the solution. Thanks in advance.
Note:
1. The VIs which are dynamically called is a plugin and not a part of EXE.
2. These plugin VIs have no dependencies from vi library and is completely isolated.
3. We are not using any .net related objects in any of the VIs.
4. The plugin VIs use Call library function node in which a C DLL developed from Microsoft Visual Studio 2010 is used.
Thanks,
Meena
Solved!
Go to Solution.

Error 1003: This clearly indicates that the 'Dynamic VI' is broken and now you should check for the various reasons, why the 'Dynamic VI' is broken.
Also path of 'Dynamic VI' is not a problem.
One thing that you may try is:
-> First open just the 'Dynamic VI' in a new LabVIEW project and check for the 'Dependencies'.
-> Now if any of the item in 'Dependencies', other than what is listed in vi.lib (lets call it 'Dependency.VI'), is also a part of your 'Main Exe', then its a problem. Because when you will execute the 'Main Exe', say in a new computer other than your development computer, it will load all its dependencies including 'Dependency.VI' (and the path will be within the 'Main Exe', but when it will try to (dynamically) load the 'Dynamic VI', this VI will also try to load the same 'Dependency.VI' but from different path and that will cause a conflict. I had experienced this.
-> If thats the issue, you may want to rename (add suffix/prefix) to all dependencies of your 'Dynamic VI' which is common to the 'Main Exe'.
Hope this solves your issue.
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

Multiple VI instance will not RUN using invoke node

Hi,
I need to have multiple instances of the same VI running.
I've created a template of the VI i wan't to call multiple times.
The VI is called via Open VI reference with a reference to the VI template.
Parameters to the instance is passed via set control value.
When opened and parameters has been passed, I use a invoke node to run the VI.
An error occur.
"Error 1000 occurred at Invoke Node in Template_Call plot window.vi
Possible reason(s):
LabVIEW: The VI is not in a state compatible with this operation.
Method Name: Run VI
VI Path: NULL"
Note ! The VIs should stay open after the call running independently of each other and the caller should not be waiting until the VI stops.
Any ideas what I am doing wrong
Regards Kahr
Certified LabVIEW Architect
CIM A/S
Solved!
Go to Solution.
Attachments:
Call_Plot Window.png ‏31 KB
Template_Plot window.png ‏23 KB

As simple as that Kumar !
Thank You all
Regards Kahr
Certified LabVIEW Architect
CIM A/S

Error 1172 occured at invoke node

Hello
I am new to Labview and object oriented programming. I have an already written c# code which communicates with a digital I/O card attached to a test system. I want to run those c# functions in labview. I am using .NET constructor pallett and then invoke node but I am receiving following Error:
Error 1172 occurred at Invoke Node Error calling method DmmCSharp.Handler.Reset, (System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
Inner Exception: System.Runtime.InteropServices.COMException: KtMDsr: A connection to the instrument has not been established.)
Image file of error and vi file is attached below.
Attachments:
vi file.png ‏5 KB
error.png ‏45 KB

The clue is in the 'A connection to the device has not been established'. You are trying to reset the device - presumably without having first configured the appropriate parameters or opened connection to it so the library is probably throwing that error.
Certified LabVIEW Architect, Certified TestStand Developer
NI Days (and A&DF): 2010, 2011, 2013, 2014
NI Week: 2012, 2014
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Frontpanel opened by Invoke Node blocks other FP

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