How to access a conditional expression IF-step via API?

If we have a flow control stage IF so we can access its conditional expression via:

"" 'RunState.SequenceFile.Data.Seq ["MainSequence']." Hand ['IF']. ConditionExpr

How to access this term if we do not know the type of step beforehand? I create a sort of auditor of static expressions. I have access to a step through

RunState.InitialSelection.SelectedFile.Data.Seq [Locals.seqIndex]. GetStep (Locals.stepIndex, Locals.groupIndex)

What if

RunState.InitialSelection.SelectedFile.Data.Seq [Locals.seqIndex]. GetStep (Locals.stepIndex, Locals.groupIndex). StepType.Name == "NI_Flow_If".

then I want to use the Engine.CheckExpression method to the conditional expression IF-step

Hey maksya,

Attached is a file of sequence with a flow control if statement that checks to see if the step is a 'NI_Flow_If' using:

"" 'RunState.SequenceFile.Data.Seq ["MainSequence']." GetStep (0, StepGroup_Main). StepType.Name == "NI_Flow_If".

If this is the case, it will then call check expression on the current ConditionExpr:

RunState.Engine.CheckExpression (ThisContext, RunState.SequenceFile.Data.Seq ["MainSequence"]. GetStep(0,StepGroup_Main). ConditionExpr, 0, Locals.errorString, NULL, null)

You will notice that this expression is not valid, and that's because "ConditionExpr" is not valid for all types of step.  However, because this step will not work UNLESS the stage is a NI_Flow_If, the expression will be valid at run time.

Also is that I changed to using InitialSelection.SelectedFile to SequenceFile just to facilitate the testing of the installation.  However, it will be the same for your SelectedFile.

Tags: NI Software

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