custom iproperties with ipt face perimeter

[windreef]

Hello everyone,
I would have the need to insert a custom properties that indicated the perimeter of a selected face. I need only for a particular part (not template) , of which I will then ipart is I would like to bring back in iproperties the perimeter of a face that will always remain the same but will change size according to the ipart .
Is there a formula to be inserted?

Thank you.

 

[windreef]

I answer myself

size = measure.perimeter("schizzo2")
parameter("perimeter") = size

I solved it with ilogic, first creating a "perimeter" user parameter exported to iproperties and then setting an event trigger that executes the rule to save the document.

The only shortcoming is that the profile of the base face must be cleaned, or without holes or processing, otherwise it calculates the total perimeter, even with the processing. I didn't find the function of the only external perimeter of the sketch, but for the moment I'm fine.