Send path control or reference to path control to sub vi

Hello! I have a question of how to build correct labview structure. I have a path control in my main vi and want to check if it is correct in a sub vi. If not correct, ask the user for a correct one in the sub vi. I see two different options of how to do it and I think no one is realy good.
1. Draw a wire from the path control to the input of the subvi. The answer from the sub vi is connected to a local of the path control. This uses locals that I should not use.
2. Draw a reference from the path control to the input of the sub vi. In the sub vi change the value of the reference if path is not correct. No output is needed. Using reference you do not see where variables changes.
How should I solve a problem like
this?
Please help me!
TJ

Thomas Json wrote in message news:<[email protected]>...
> Hello! I have a question of how to build correct labview structure. I
> have a path control in my main vi and want to check if it is correct
> in a sub vi. If not correct, ask the user for a correct one in the sub
> vi. I see two different options of how to do it and I think no one is
> realy good.
> 1. Draw a wire from the path control to the input of the subvi. The
> answer from the sub vi is connected to a local of the path control.
> This uses locals that I should not use.
Local variables are fine. Don't worry about using them.
Paul Cardinale

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Illustration:
In the diagram above, subVI 1 has been created from a sequence to which a reference to "Numeric Control" was connected. Here is the FP of that subVI, as created by LV:
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Kind of an extension of this bug, but not exactly the same. Might be due to the same cause though
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After:
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Here is the corresponding FP of the created subVI:
This time, never mind the names of the original controls, they will be ignored, no matter how many different controls there is.
(I am not even mentioning the well-known feature that if instead of enclosing the property nodes you just enclose the wires coming from the "Value" node, the subVI's controls will read "Value, Value2", etc, where the type of the "Value" controls will in general have absolutely nothing in common).

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Get Specific References for all Controls

Using slightly modified code from here, I am generating an array of all control references on my main front panel which is then passed through to a number of subVIs. Although this functionality does work, it would be preferable to get specific references to the controls (for example, Boolean RefNum instead of Control RefNum).
Getting these specific references seems possible using To More Specific Class and Class Specifier constants. However, data storage becomes an issue because I can no longer use arrays (as they are a different data type). I am not sure if there is another way to pass this data on. I have experimented casting the RefNums to Variants, but to get the data from the variant, I have to know what RefNum type I am expecting which sort of defeats the purpose of doing this in the first place.
A secondary problem is keeping the names of the references. The Control RefNums do not have names associated with them nor do I know how to assign names to them. I've again tried using variants and using the OpenG Set Data Name function, but this crashes LabVIEW without any indication of why.
I've attached a version of my code that tries assign names using OpenG Set Data Name and build a variant array. To run it, simple add the VI as a subVI to a VI that has some boolean controls on the Front Panel. Apologies for the rough state of the code - I'm still in the process of figuring out how to make it work so things are a bit messy.
Solved!
Go to Solution.
Attachments:
Get Specific Control Refs.vi ‏28 KB

I don't know if you'll get much better. There is really no way I know of to have some fully flexible way of building named clusters of references based on any given front panel set you feed to it.
I tend to do things the manual way (as there are also a bunch of references to front panel elements I wouldn't need). I would do all the bundling work in a subVI.
I'm attaching a zip file that contains the key VI's (unless I missed something) on the first project where I really tried to abstract out the reference building. The files are LV9.
On my main VI, I have the subVI called Build UI References early in the VI during an initialization phase. I pass the reference to the main VI into that subVI that builds all the references. I worked it as a master cluster that contains elements that are arrays of references of related controls. It uses another subVI called Get References and Label Names that I created to help find controls. I still need to use More Specific Class to get the property references, but I don that only once at the beginning. I then pass that cluster wire out and to anywhere in my VI that would need access to the references for front panel elements.
I use arrays of strings to supply the names I need to build and bundle the references. This lets me ignore controls I don't care about. The disadvantages to my system is that if I change the name of any control, I need to update the name within this subVI. And if I want to add any controls, not only do I need to add the label names for the searching functions, I also need to update my typedef cluster (and you definitely want this to be a typedef) to add a spot to store the new reference.
I hope this gives you some ideas. It worked for me and I will likely use the scheme on another project (or even rewrite past projects using this scheme.) If there are any ideas for improvements, I'd be happy to hear them.
Attachments:
Build UI refs.zip ‏83 KB

How can I get a reference to all controls on a front panel of one type )for example of the type Text Ring?

I'd like to set the strings[] property of all the Text Ring controls on a front panel at once without creating a property node for every text ring. How can i do that?

> How can I get a reference to all controls on a front panel of one type
> )for example of the type Text Ring?
>
> I'd like to set the strings[] property of all the Text Ring controls
> on a front panel at once without creating a property node for every
> text ring. How can i do that?
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The part of this that will probably be the least obvious, when you
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Performance issues using control references in Analog control loop?

My main vi of a tensile tester control application calls a number of sub-vi's, including a analog control loop which controls the test. The control loop must update some boolean and digital indicators and respond to user input on the front panel of the main vi during a test.
To simplify my main vi, I moved the control loop code into a sub-vi, and used control references to access the controls and indicators on the front panel. However, this has dramatically affected my loop performance, and the loop can no longer keep up with the acquisition speed.
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I have had the same problem. I have discovered other funny things about references also; some kind of memory management (or mismamagement?) is taking place behind the scenes.
Regardless, you can often do away with the references by passing the initial state of a control or indicator into the subvi, changing it inside, and passing the altered state back to the caller. Once back in the caller you update the front panel control or indicator by using a local variable.
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09990019711.

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"Share_Good" <[email protected]> wrote in message
news:[email protected]..
> Hello... i want to disable the control's short-cut menu
programmatically. i could do it by using the event structure and 'shortcut
menu activation' event. this is why i am asking about getting the menu
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Send path control or reference to path control to sub vi

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