How can I create a function using TestStand variables and call it from a step's Pre-Expression?

[bmihura]

In one sequence I have dozens of Pre-Expressions which are almost the same thing, like this...

Locals.tagID = (Parameters.singlePhaseEnabled ? "L" : "D") & Str(Locals.phase) & "006"

...and the only thing different is that three digit string at the end ("006" will vary). How can I write a function that I can call from a step's Pre-Expression so it would look something like this? ...

Locals.tagID = MyNewFunction("006")

[Norbert_B · Accepted solution]

You cannot write custom commands for expressions.

That being said, there are a couple of options:

• Create a subsequence with a single step. Use a parameter of the sequence as "function parameter".
• Create a custom step type including a substep module which implements the function. Add an edit substep to enable the user of the steptype to gracefully change the parameter.
• Store the variable parameter in a local/file global variable and modify the value in each step. This will, at least, keep the "function" the same for every step.

Norbert

[bmihura]

Good ideas, thanks.

Bruce