Reference to a type

Hi,
I have created a subvi which I now use in my main VI, however, I now want to use the values from the subvi WITHOUT having to have a control in my main VI. I can't seem to find a tool to convert a reference to a type.
Anyhelp would be much appreciated.
Thanks,
Paul.

Hi Ben,
I have included a simple VI of what I would like to achieve. Any questions just ask.
Please keep in mind that this is a simple model of what I would like to do.
Thanks again,
Paul.
Message Edited by bigdave on 11-08-2005 12:13 PM
Attachments:
subvi.zip ‏17 KB

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Attachments:
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ClassSample Project.zip ‏116 KB

It depends a bit on your final intention. Bascially you have a shared state that you want to access asynchronously from different places. If you know that the actual object is only created once (terminilogie here is a bit shaky as every wire split would create a copy of the LVOOP object but I hope you know what I mean), you could use a global or Action Engine to store the state. Using a DVR for this state and adding the DVR to your object class data is however a more scalable approach as it will allow you to instantiate more than one object of that class and each one will contain its own DVR that will reference the same value for the specific object instance even if you split the object wire, creating actually two copies of that object (but for the purpose of this discussion they would be still the same object instance).
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a division of Test & Measurement Solutions

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I have created a type definition that I would like to use across my application. This particular type definition is also the front panel control to my top level VI. I wanted to pass a reference to this control to my SubVi's so that they could dereference as needed and in very rare cases update the values on the front panel. However, as I built the application I noticed that I was breaking the control reference as I updated the type definition. This implies that they type of the reference changes as I change the type definition.
How do I go about building the reference I need or is there some other way to do this that works just as well. Even if I can't make a reference to the control that is tied to the type definition, I'm willing to pass in a variant who can house the reference as long as I can build the data type (the reference) inside my SubVis.
Solved!
Go to Solution.

Okay, so I tried all three approaches in a SubVI, here's what happened.
My approach was simply to create a Type Def control, right-click and create a Reference. Then create a control from that reference by right-clicking the output of the reference and selecting the Create Control option. I then pasted this 'cluster' reference into my SubVi, made it an input and then wired up the reference in the parent to the control in the SubVi.
Result: This breaks when you update the Type Definition.
Next, Ben's approach (or my best effort at doing what he suggested). I created a control from reference to the type def. I cut it from the parent VI and pasted it into a new type def. I then put the type def in the SubVI and set it as an input.
Result: This breaks when you update the Type Definition (but it actually takes a bit longer for the error to propogate).
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Result: It works!
It's possible I just didn't understand how to make the reference type def you were referring to Ben. I would prefer a method with less verbage. I pass this refnum into a class which holds it. Since I can't replicate the type exactly prior to run time (i.e. create a control that is exactly a reference to the type definition of my front panel), I have to save the reference as a Control Refnum and cast it every time I need it (i.e. create a control from the typedef, create a reference frome the type def, etc). More verbage than optimal, but still good!
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