Using the Manager of synchronization for exe OI LabVIEW and TestStand
We would like our operator LabVIEW executable Interface send data via a queue of TestStand to a sequence of logging. The SyncManager API looks like a slick way to do this because it allows access to the synchronization objects other processes outside TestStand TS. I created an experimental sequence of trying the concept. The sequence creates a queue with a step of queue TestStand, up a point to another TS not queue, then uses calls to ActiveX in the SyncManager API to add another element to the queue of waiting. That all works.
When I added a LabVIEW VI to place another element through similar calls to ActiveX in the SyncManager API, the VI is not a valid reference to the queue and so it cannot place the element.
I read on the forum that TS queue name must start with * in order to be accessed by separate processes on the same computer. When I add a * on my queue name, queue TS operations continue to operate, but step that uses a call of ActiveX in the SyncManager API to get a reference to the queue returns one null ref so the next step of enqueue ActiveX returns an error. In addition, the LabVIEW VI still does not receive a valid reference to the queue either.
Ideas and suggestions welcome! The sequence and LabVIEW VI are attached. Using LV and TS 2012, obtained similar results in 2013SP1.
Thank you!
Hans
The queue API expects a PropertyObject not a string for the newElementPropObj parameter (not sure why LabVIEW similarly let you thread a string). To create a new PropertyObject, you can do something similar to the following:
myProperty = engine. NewPropertyObject (PropValType_String, false, "", 0);
myProperty.SetValString ("", 0, theActualString);
Enqueue it.
Close the ref to myProperty after you're done with it (i.e. after the queue it) in order to avoid leaking.
-Doug
Tags: NI Software
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