select instance of polymorphic vi at compile time

[Keith_W]

quick question:

I have a fairly significant labview project that i'm deploying to several compactRIOs.  However, I have two possible configurations of that code.  The difference between the two configurations is a single VI.  That is, within my project, there's one VI that I replace with another (same connector pane) for the alternate configuration.

What I want to do is to make that VI into a polymorphic VI, then have the instance of that polymorphic VI be set at compile time.  That is, I would have two build specifications.  Each build specification would build a configuration of the project by having the selection of which instance of the polymorphic VI to use be included as a parameter of the build specification.  If it is possible to do, I can't seem to find the option in the build specification preferences to do so.

Does this make sense?  Any help is appreciated.

Cheers.

[ABCPrograms]

Why not load the VI you want to use dynamically?

Depending on what you want to do, open a reference to the other VI, and run it

[Yamaeda]

Sounds like a Conditional Disable-structure to me. You should be able to set the flags from the Build-specification, though i haven't tried it much.

Basically like a ordinary Disable structure, place your two vi's in a frame each and then have the compiler enable a frame.

/Y

[Keith_W]

ABCPrograms: that's fine, i don't have a problem with the dynamic run thing, but how would the program detect which build specification it's being run from?

[Keith_W]

yamaeda, i'm unclear about what you're suggesting.  are you suggesting that i use the VI scripting VIs to programmatically edit the VI to switch which state is enabled by using a VI that runs before building, but as part of the build process?

[Yamaeda · Accepted solution]

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@Keith_W wrote:

yamaeda, i'm unclear about what you're suggesting.  are you suggesting that i use the VI scripting VIs to programmatically edit the VI to switch which state is enabled by using a VI that runs before building, but as part of the build process?

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The Conditional disable seems to work like a script at compile time. As you stated your problem it sounds like you wanted 2 builds anyway, and this would enable one of the conditional frames when building the exe.

/Y

[Keith_W]

I understand what you're saying now.  This looks like just what I wanted.  I'm off to go lookup how to set custom symbols.  Thanks!

[tst]

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@Keith_W wrote:

I'm off to go lookup how to set custom symbols.

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As far as I know, you can't do this in the UI. I believe there's an idea in the idea exchange to allow this, and you can probably also set the build to run a pre-build VI which will use VI server to set the symbol for the build. There are probably examples of this either here or in the LAVA forums.