From any running subvi('s), read controls and choose the ones you want to save to file

[thitchen007]

Hi all,

I now want to read controls from any running subvi('s) and save the data into a single file. I'm using subpanel to display the running subvi and use control reference to collect all the string-typed control and save the data to a single file. While that's cheating and ugly, because the host vi usually doesn't know what controls will be there in the subvi('s).

I'm wondering if there is a way to dynamically read controls from any running subvi and display all the avalible controls depends on what subvi is running, and let the user decide which data are to be saved. I attached the vi I have now, please give any comment and I thank you very much in advanced.

-chen

[GerdW]

Hi thitchen,

without looking at your code:

with the VI reference you can get references of all controls on the VI's frontpanel. With that reference array you can collect all string controls in that subVI. The you should display a list to the user with the names/contents of those string controls so she/he may select which ones to save...

[thitchen007]

Thank you. But could you give a hint on how to program to read the user's selection, please? Many thanks.

[GerdW]

Hi thitchen,

you could use a list control with "multi selection" enabled. So the use can mark all items that should be saved...

[thitchen007]

OK, I kind of catch what you mean.

But one more question, please.

Those Subvi 's not only have string typed controls, they may also have INT DBL...
but control reference only return a "variant" which is up to the programmer to decide which specific class data to convert to, do you know a way to display all kinds of controls without knowing the type of each of them? Many thanks.

[GerdW]

Hi thitchen,

you can check the control type the same way you can read the label and the value: by property node...

[thitchen007]

GerdW, thanks so much for your time to answer my questions!

[apok]

maybe his example will help you...

[thitchen007]

Hi apok,

Thank you for the example, not sure whether we are talking about the same problem. Anyway, I'll go with control reference to read out the data from the running subvi's. Thank you for your comment.

Best,

-chen