Mini-Nugget Creating Typedef'd queue references

Transfering typedef'd data using queues used to be tedious if the typedef changed and the transfering queue reference is passed between VI's using controls. The tedious part was updating all of the controls for the queue ref since they would not be linked to the typedef of the data the queues transfers. This Nugget exaplains how to create a queue ref that is tied to a type definition.
1) Drop an obtain Queue
2) Create, drop, and wire a typedef of the data that will be transfered by the queue.
3) pop-up on obtain Que output and select "Create Control"
4) Find created control and pop-up to select Advanced >>> Customize
5) In control editor use the control palette >>> "Select a Control ..." and browse to the typedef from step #2
Note:
A) The typed must be dropped on the pink boxes
B) The marching ants around the queue ref control confirms you are dropping in the correct location.
6) Save the queue ref control as a type def.
If you look at your hiearchy you will see that the typedef'd queue ref is using the type def from step #2.
I hope this helps!
Ben
* This works in LV 8.6 but not in LV 7.1. I am not sure in which version the feature was introduced.
Message Edited by Ben on 11-11-2008 02:21 PM
Ben Rayner
I am currently active on.. MainStream Preppers
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Solved!
Go to Solution.
Attachments:
Drop_Obtain_Que.JPG ‏19 KB
Drop_n_Wire_Typedef.JPG ‏21 KB
Drop_TypeDef_in_Control.JPG ‏41 KB

That sounds about right. I started doing this about LabVIEW 7.0 when I started using single-element queues for reference objects. I always used the "create control, customize, save" method for creating the strict typedef reference, since it did not update correctly by itself in 7.0. There were a lot of changes made in 8.0, some of which resulted in some fairly nasty crashes and hangs on type propagation (always modify your cluster with nothing else open in 8.0). These were fixed in 8.2. At this point, type propagation seemed to work OK. However, I have been through a lot of versions of LabVIEW and have learned never to trust my memory on things like this. Try it. If it works, you are good .
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Similar Messages

Queue Reference on a DVR?

Hi All,
I am trying to track down a bug in my code to no avail (so far). I wanted to check if my problem is caused by a 'feature' in LabVIEW while I continue to tear (whats left of) my hair out.....
Here is what I'm doing:
I create my 'communication queues' in my toplevel vi. These are unnamed. My toplevel vi is a queue-based state machine. I'm using OO by reference. Therefore the place where I've stored my reference is Object>DVR>Cluster>queue reference.
Using the toplevel.vi I kick off a user interface. I do this by using Static VI reference>SetVal to pass the object/DVR value to the UI and then >Run (wait til done false) to start the UI.
And here's the problem: when put an element on the toplevel state-machine queue using the UI its not received by the toplevel state machine.
Here's what I've looked at to try and find out what the problem is
The element is placed in the queue with no errors
The references are valid
One this I did notice is that when I probed the reference hex numbers they are different - my understanding was creating a new queue reference by name would give two different references to the same queue in memory (and so they have to be closed). But in my case I only create one reference to the queue, put it in my DVR and remove it as needed.......so what are the values different?
I've used this same architecture already in this project but in this case I didn't put the queue references on the DVR - instead I opened new references by name whenever I communicated between modules. This worked fine......but I'd prefer not to restrucutre my code if I can avoid it!
If anyone can offer suggestions that I can check or indeed if this is a 'feature' which has come up before I'd appreciate any comments,
Thanks,
Dave
Solved!
Go to Solution.

Hi All,
Please disregard the comments about the reference hex numbers being different - I built a very simple test program to make sure performance was correct and found that it was. In my test code both reference numbers are identical as should be expected! Its a common/garden bug causing my problem not a LabVIEW 'feature'......just gotta find the bugspray now!
Dave

Opening/Closing Queue Reference By Name

I'm curious if opening and closing a queue reference to put information onto the queue, using the queue name -> obtain queue -> enqueue -> release queue(Non Force) is problematic. I thought i saw a thread a long time ago that opening/closing a reference to a queue over and over could lead to a memory leak, even if the original queue never was released. Obviously, i'm ignoring the general pass the wire(by value) correct labview way.
Instead of opening/closing using the queue name i could also wrap the queue reference in a FG after originally creating it and work on the reference that way. Ignoring the "right way to do it" are there still downsides, other than programing correctly, to open/closing queue reference's in this fashion such as memory leaks.

PaulG. wrote:
I have never heard of any unwanted consequences of repeatedly opening and closing any reference. The trick is to make sure a reference gets closed when no longer needed. I don't see any reason not to implement queues the ways you describe. I've done all three and haven't had any issues that I know of. If opening and closing a queue reference repeatedly caused a memory leak that would be considered a bug.
I have to disagree here. A couple of years ago I was using a DAQmx Write with "autostart" option set to TRUE in a loop (ca. 100ms timing) to constantly make sure, that in application standby my Digital Outputs kept the values they ought to have. This reproducibly caused a blue screen on Windows after 6 hours of the program running in standby. As it turned out, LabVIEW was using a new reference to the task for every call of the Write, because with autostart set to TRUE it had to create the task beforehand and close it afterwards. After the mentioned peroiod of time, LabVIEW ran out of reference numbers, as the support explained to me.
Of course, even LabVIEW Help says to avoid using autostart=TRUE with DAQmx VIs in a loop, but only because of the overhead the repeated Create and Clear is consuming. Naturally, I have learned that the hard way now.
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When do VI and queue references become invalid?

Hi all,
I have a fairly complicated problem, so please bear with me.
1) I have a reentrant SubVI (let's call it VI "Assign") that has an input cluster of (VI ref, queue ref) (let's call the cluster type "Refs"). If the VI ref is invalid (first execution), the VI ref and queue ref are assigned values and are passed on as an output cluster of same type. (The VI does other things too, but for simplicity only this is important.)
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The problem is that the moment an instance of VI "Template" is closed, the queue reference becomes invalid, although the actual variant value of the reference remains the same. The VI ref can become invalid or not, depending on small changes, but is always reproducible. I assume there must be some similarity between VI and queue refs. After spending some time researching, the Labview help states for the Open VI Ref component "If you do not close this reference, it closes automatically after the top-level VI associated with this function executes." In this case I assumed it means that the moment the reentrant VI "Assign" finishes, the references will get cleared ?? So I made a non-reentrant VI (let's call it VI "NR Assign") that only assigns values to the references and VI "Assign" now calls this VI (It effectively does what I described VI "Assign" does). I keep this VI alive by using it in a VI which never terminates and since it never terminates, the references should never become invalid. Anyone still following? This didn't solve the problem though. If I reproduce the same scenario using only one instance of the template VI, it works just fine. Furthermore, the VI and queue references are never closed, to aid analysis of the problem. Can anyone shine some light on what happens when a template VI terminates? Could this be the problem?
Unfortunately I cannot include the code.
Thank you whoever is able to make sense of this.
Christie

Christie wrote:
Hi all,
I have a fairly complicated problem, so please bear with me.
1) I have a reentrant SubVI (let's call it VI "Assign") that has an input cluster of (VI ref, queue ref) (let's call the cluster type "Refs"). If the VI ref is invalid (first execution), the VI ref and queue ref are assigned values and are passed on as an output cluster of same type. (The VI does other things too, but for simplicity only this is important.)
2) The VI that calls VI "Assign" (let's call it VI "Store") is not reentrant and has a local variable of type "Refs" that is wired to the input and output of VI "Assign". This VI effectively stores the references. The references returned by VI "Assign" are always valid right after the call, but after the problem condition described below, they are invalid at the start of all calls before they are passed to VI "Assign".
3) VI "Store" is called by multiple non-reentrant VIs, so the local variables of VI "Assign" retain their values (Has been tested and verified to retain their values). The VI causing the problem in this case is a template VI of which multiple copies are launched (let's call it VI "Template").
The problem is that the moment an instance of VI "Template" is closed, the queue reference becomes invalid, although the actual variant value of the reference remains the same. The VI ref can become invalid or not, depending on small changes, but is always reproducible. I assume there must be some similarity between VI and queue refs. After spending some time researching, the Labview help states for the Open VI Ref component "If you do not close this reference, it closes automatically after the top-level VI associated with this function executes." In this case I assumed it means that the moment the reentrant VI "Assign" finishes, the references will get cleared ?? So I made a non-reentrant VI (let's call it VI "NR Assign") that only assigns values to the references and VI "Assign" now calls this VI (It effectively does what I described VI "Assign" does). I keep this VI alive by using it in a VI which never terminates and since it never terminates, the references should never become invalid. Anyone still following? This didn't solve the problem though. If I reproduce the same scenario using only one instance of the template VI, it works just fine. Furthermore, the VI and queue references are never closed, to aid analysis of the problem. Can anyone shine some light on what happens when a template VI terminates? Could this be the problem?
Unfortunately I cannot include the code.
Thank you whoever is able to make sense of this.
Christie
All LabVIEW refnums do get deallocated automatically when the top-level VI in whose hierarchy the refnum was created goes idle (stops executing). You will have to make sure that the creation of a refnum is done inside a VI hierarchy that stays running for the entire time you want to use that refnum.
Rolf Kalbermatter
Message Edited by rolfk on 06-27-2007 11:52 AM
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

BAPI: Create Sales order with reference to Quotation

Hi ...
I am using bapi BAPI_SALESOREDER_CREATEFROMDATA2 and
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..Ashish

Hello,
nice to see that this has already been solved.
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*   BINARY_RELATIONSHIPTYPE       =
*   INT_NUMBER_ASSIGNMENT         =
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*   testrun                       = 'X'
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*   ORDER_SCHEDULES_INX           =
*   ORDER_CONDITIONS_IN           =
*   ORDER_CONDITIONS_INX          =
*   ORDER_CFGS_REF                =
*   ORDER_CFGS_INST               =
*   ORDER_CFGS_PART_OF            =
*   ORDER_CFGS_VALUE              =
*   ORDER_CFGS_BLOB               =
*   ORDER_CFGS_VK                 =
*   ORDER_CFGS_REFINST            =
*   ORDER_CCARD                   =
*   ORDER_TEXT                    =
*   ORDER_KEYS                    =
*   EXTENSIONIN                   =
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Creating a Invoice with reference to another invoice with new pricing proce

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closed
Edited by: vinit parkar on Sep 1, 2011 4:25 PM

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http://logicblaze.com/
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Mini-Nugge​t Creating Typedef'd queue references

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Mini-Nugget Creating Typedef'd queue references