Executable flashes at startup if the top-level VI is in a library

[raphschru]

I noticed, when one of my LabVIEW executable starts, the front panel of the top-level VI always flashes briefly from its "development look" to its "runtime look", as if it was opened before the LabVIEW runtime starts.

Front panel of the top-level VI in development:

Window Appearance config:

Window Run-Time Position Config:

When starting the executable, the front panel always flashes like that:

My application is only 1MB, so it should load quickly.

I've tried all sorts of hacks, like:

 - checking "Window runs transparently" with transparency to 100%.

 - setting the runtime position to "Minimized" (with "Allow user to minimize window" checked).

 - adding "HideRootWindow=True" to the executable ini.

Anything I've tried, there was always some kind of ugly flashing...

...Then I dragged my top-level VI out of its owning library, recompiled and the issue disappeared completely!

So I wonder if it is a bug or if it is a somehow a performance issue due to the fact that the top-level VI forces the library to load before starting?

Attached is an example project to reproduce the issue.

Executable "Main in Library.exe" uses a Main VI from a dummy library > flashes at startup.

Executable "Main.exe" uses a similar Main VI that is NOT in a library > no flash at startup.

I could reproduce this behavior in LV2020-32bit (SP1) and LV2023-64bit (Q3) on Windows 10.

Regards,

Raphaël.

[thols]

See these threads:

https://forums.ni.com/t5/LabVIEW/Is-it-possible-to-write-an-application-in-LabVIEW-2020-that-has/m-p...

https://forums.ni.com/t5/LabVIEW/2015-Fast-File-format-disrupts-Window-Run-Time-Position/m-p/3238306

[raphschru]

Thanks for the links.

Ah, too bad I didn't find your first linked thread before.

Anyway, the objective of my thread was more to point out a potential bug (which is apparently known since 2015).

As I understood, there seem to be a ton of workarounds (that may of may not work) but the root cause has still not been addressed/identified/corrected after many years...

Regards,

Raphaël.