Register Event Callback - Error 1001

[Saranbalu]

Hello Everyone,

I am trying to use register event callback to process a control's value change events that occur in another instance of LabVIEW. For example, from a LV executable, I dynamically run a VI (force it to open it in IDE using localhost application reference) and when a specific control in that VI changes value, I want to trigger some events in the executable.

I have attached 3 VIs - Call Update.vi is the top level. When I run this VI, I get error 1001 - VI Front panel is not open.

When I delete the application reference going into the open VI reference function, the event is getting registered without error.

Am I missing something in the code or I cannot use register event callback like this? Ultimately I want to include the code in Call Update.vi in my executable and make it run from there.

Thanks,

Saranya

[muks]

Check this

[Saranbalu]

Hi muks,

Thanks for referring to that link. But that doesn't solve the issue. VI front panel is definitely open and it is also waiting to run.

Everything runs fine if I do it in the same application instance. In IDE, I dynamically open the VI, take a control reference from this VI, register for event callback works fine. While in an executable, dynamically open the VI, register for events, and that works fine.

Problem arises only when I try to force open the dynamic VI in IDE from my executable. Actually when I try to do the same being in the IDE itself doesn't work too (force open the dynamic VI with localhost application reference)

I can post a screenshot of the Call Update VI here if you want.

Thanks,

Saranya

[Shreyas]

Check this out.