How can i recursivly call a vi

[Matthew Simpson]

i am writing a program to build messages to be sent along a tcp connection.

the program reads in message definitions froma file, and calls an appropriate vi to build each individual field. However, some fields are compound fields, made up of other field types. I would like to be able to call the vi that selects fields from itself. Is there anyway to do this?

[Henrik Skupin]

Matthew Simpson schrieb:
> i am writing a program to build messages to be sent along a tcp
> connection.
>
> the program reads in message definitions froma file, and calls an
> appropriate vi to build each individual field. However, some fields
> are compound fields, made up of other field types. I would like to be
> able to call the vi that selects fields from itself. Is there anyway
> to do this?

Nope, you can't call subVI's recursivly. 😕

--
Henrik Skupin

[JeanPierre]

Yes you can.

Make the SubVI reentrant.
In the SubVI, you call next level with a dynamic call to itself. When opening a reference to a reentrant VI, e new instance is created. Call the subVI and close the reference.
However it is inefficient. Most of the time, it can be implemented otherwise, keeping a stack of inputs in the shift registers of a while loop.

[Matthew Simpson]

Is this possible in LV6.1 ? I have tried following what you said, but i get an error saying "attempting recursive call"

[JeanPierre]

Here is the classical factorial example, it works in 6.0. Two important things to check:
- the subVI is reentrant
- a new reference is opened for each new level of recursion.