Run test uut entry point only once

Question

Hi,
I want to avoid that users can run test uuts entry point more than once. I use an operator interface written in CVI 7.1.1 and netry point button is deactivated when run state changes. But after loading the application sometimes is too slow so the user can press this button twice before it is deactivated.
So is there any possibility to avoid running this entry point more than one time?
Regards
Steffen

Answer 1

Steffen,
Thank you so much for the help.  You recommendations worked perfectly.  Both of us implemented more or less the same behavior in our operator interfaces, although we used slightly different methods.  Here is what I did:
I established a count variable in my operator interface that is initially set to 0.  Each time the Test UUTs or Single Pass button is pressed, I increment the count by 1.  I determine that the Test UUTs or Single Pass button is pressed by registering for and handling the Application Manager PreCommandExecute event.  In my callback for this event, I examine the returned Command and look at its EntryPointIndex property to see if the index is 0 (Test UUTs) or 1 (Single Pass).  If it is, I increment the count variable count by 1.  If the index is not 0 or 1, I do nothing.  Once execution has stopped, I reset the count variable back to 0.  I do this by registering for and handling the ExecutionView Manager RunStateChanged event (as you recommended).  In my callback for this event, I examine the returned newRunState to see if it stopped (numerical value of 3).  If it is, I set the value of the count variable back to 0.  If it isn't stopped, I do nothing.
This method is basically the same as the one you propose.  This method allows you to use the built in TestStand buttons instead of having to use those found in your development environment.  The only drawback is that they don't disable and gray out during execution; they just do nothing when an execution is in progress and the operator presses them.