Can I catch front panel events of a vi which calls a subvi in the subvi?

Hello,
I have a vi with a picture control. This vi calls a subvi. Can I, while
the subvi is running, catch frontpanel events from the calling vi in
the subvi?
Background: The subvi should do all necessary tasks to draw
things in the picture control of the calling vi, but depends on things
like mouse moves and button clicks on the picture control of the
calling vi.
I know that I can generate user events in the calling vi which can be
caught in the subvi. But I developed the subvi as a standalone test
version, and want to include it now in a larger project, without to
much changes to the larger project.
I'm using Labview 8.0.1
Best
Armin

Hi devchander,
> It will not be possible to catch the Front panel events of main VI from inside a sub VI using an event structure.
I don't think Armin want's to do this - it seems he's trying not to modify existing code - but if he does, it is possible - and an example is attached!
( just run the example as a sub-vi, it will create a string of mouse-direction-codes while the left-button is held down over caller's FP )
Hope it helps!
Message Edited by tbd on 08-17-2006 11:45 PM
Message Edited by tbd on 08-17-2006 11:48 PM
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)
Attachments:
MouseTrap.vi ‏138 KB

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Untitled 1.vi ‏24 KB
Untitled 2.vi ‏10 KB

What you did, in theory, is the correct way to do it. However, you should move the front panel open and close into Untitled2.vi and have a boolean input as to whether to show the front panel or not. This way, your calling code is cleaner, and you don't have to reproduce the code everytime you want to call the subVI and show the panel.
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m3nth wrote:
Problem 1) Some of the front panels were being removed for dynamically loaded VI's, which were not set as dynamic VI's in the Application Builder, but which were static-linked VI's in the program (so they were loaded in memory as linked subvi's but called dynamically). When the Application Builder decided to remove the front panel for those VI's, there was an error when loading them dynamically.
This is expected behaviour. The application has no way of knowing that these VIs will at some time be called dynamically. That would require analysing and understanding the entire program and in cases where you calculate the dynamic VI to be called at runtime it still wouldn't be feasable to do so.
m3nth wrote:
Problem 2) Some of the front panels were NOT being removed for subvi's that I didn't want to have their front panel built into the compiled program. Loading front panels that are not needed uses extra memory, but there was no way to change the option to not load the front panel for certain particular subvi's in Application Builder--the option was grayed out.
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Jeff·Þ·Bohrer wrote:
A better approach is to set the vi properties programaticly like this:
Jeff, you will be happy to know that I used this tactic in full force on a project recently (lots of dialogs in this program). Not sure how many LabVIEW reboots it has saved me from. Reuse VIs made it even easier to do.
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Can I catch front panel events of a vi which calls a subvi in the subvi?

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