Error CheckExpression for a Boolean constant

I have a LabVIEW VI, with ExpressionEdit TestStand control, in which the user will enter a constant or an expression of TS for a Boolean control. I put this text to the ExpressionEditor control using nodes TestStand ActiveX and ValidateEvaluationType. It works without any problem. The next step will be CheckExpression, which actually gives the same error for the correct values. Even if the expression is a simple true or False, error information are expected Boolean or string or FALSE or TRUE, or..., find number {comma floating 64}. How is - it possible and how do I fix this?

 

Thank you

George S

Hi Doug,.

I solved the problem. I had used the joint box as one of controls & so to add its values (FALSE, TRUE, MIXED), as AdditionalEvaluationConstants in the ExpressionEdit ActiveX control. Since in the next step, I enter False for another Boolean control, this fake is associated with constant evaluation of the joint box (which is in fact a numeric type) resulting in a type mismatch error. Now, I've removed the AdditionalEvaluationConstants after Mixed checkbox is selected & now the Boolean True/False is detected correctly & there is no error. Thank you for your help.

Thank you

George S

Tags: NI Software

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