Detecting whether vi has been called or run

Question

    Ok, I must have missed something because I can't figure out how to
detect whether a VI has been RUN (i.e. is a top-level VI) or has been
called from another VI. I can get at the "Callers" VI server property
to see if the array is empty or not, but if any VI that calls the VI in
question is in memory at all, it gives a false positive. The "First Call?" VI is useless too since it gives a "true" whether the VI is top-level or has been called from some other top-level VI.
Am I missing something obvious?

Answer 1

"lanmat" <[email protected]> wrote in message news:[email protected]..
&nbsp;&nbsp;&nbsp; Ok, I must have missed something because I can't figure out how to
detect whether a VI has been RUN (i.e. is a top-level VI) or has been
called from another VI. I can get at the "Callers" VI server property
to see if the array is empty or not, but if any VI that calls the VI in
question is in memory at all, it gives a false positive. The "First Call?" VI is useless too since it gives a "true" whether the VI is top-level or has been called from some other top-level VI. Am I missing something obvious?
Hi,
The Callers property returns all vi's in memory that call the vi. So that won't work.
Try the Call Chain function. If there is only one element, the vi (the current run of it) is top level.
You can also use the property "Execution>State", which returns "Running" or "Running Top Level". But the call chain is easier.
Remember, if you put the call chain code in a sub vi (you should) you have to check if there are two elements!
Regards,
Wiebe.