There is a very frustrating problem with the app builder in LV 8.0.1. Certain VIs compile and run fine in labview, but the app builder
refuses to make them into applications.
The error message is very long and ends with something like "The VI is not
executable". Standard advice for this problem is to force LV to recompile
everything you're building by either mass compiling or ctrl-shift clicking the
run arrow, but this hasn't worked for me in two separate cases (completely
different projects).
It seems that this problem is caused by wiring a strictly typed VI reference to
an invoke node with the FP.open method selected. In both cases I resolved
the issue by changing the Static VI Reference to be weakly typed (right-click
the static vi reference and make sure "Strictly Typed VI Reference"
is unchecked). After that, the project build successfully.
This is very hard for a user to track down for several reasons:
- The error message in the application builder does not give any
indication as to what the real problem is
- The app builder reports that the top-level VI is broken, even when the
strictly typed reference and invoke node may occur in a sub VI
- Nothing (that I can
find at least) in the documentation suggests that strictly typed references
won't work with the Open.FP method.
There is a page that says "some of the properties and methods do
not work when you configure this function to output a strictly typed VI
reference," but no indication is given of which methods fail
Note that in one case I was also able to make the project
build by deleting an instance of "IMAQ Create.vi" from the top-level
VI. I
have no explanation for this.
Hopefully this post will save some other users the trouble
of tracking this down and maybe even get NI to correct the issue for future
versions.
Adam Brewster
