How to Get Step Properties From a Sequence File in LabVIEW

Updated Oct 28, 2022

Environment

Software

  • TestStand

I am looking a way to get step properties from a sequence file without opening the TestStand. Is there any TestStand API that we can use to achieve this with an application written in LabVIEW?

  1. Launch NI TestStand and create a new sequence.
  • Add a Statement step
  • Rename the step to Test
  • Use the expression Random(1,100) in the Expression field
  • Save the sequence as Test.seq in C:\Test\
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  1. Launch LabVIEW and create a new VI. Now, you should use the TestStand API Reference Help to implement this functionality.
  2. Create an instance of the TestStand UI Application Manager.
  • Create the TestStand Engine object using the ApplicationMgr.GetEngine method
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  1. Call Engine.GetSequenceFileEx method to load the sequence file located in C:\Test\Test.seq.
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  1. Access the MainSequence using the SequenceFile.GetSequence method and passing 0 to index.
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  1. Call Sequence.AsPropertyObject method to access properties and methods defined in the PropertyObject class.
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  1. Call PropertyObject.GetValString method.
  • Use a lookup string Main["Test"].TS.PostExpr to retrieve the Post-Expression of Test step 
  • Pass 0 to options to specify the default behavior
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  1. Release the sequence file using Engine.ReleaseSequenceFileEx method and close all references.
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  1. At this point, the VI will look like this.
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This VI would return "Random(0,100)" in GetValString string indicator once you run the VI.

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