ExpressionEdit UI Control. Set "Check Expression"

[Roman_L]

Hi All,

I have a dialog window in LV  which should contain an  ExpressionEdit ActiveX Control. 

The user must be able to check if an expression is valid.  In my particular case the control must evaluate an expression as Boolean. For this purpose i use ExpressionEdit.SetValidEvaluationTypes method and  PropValTypeFlag_Boolean (see vi attached). But the problem is that any expression passes an error check 😞 

Any Idea what could go wrong here?

Best regards,

Roman

[~jiggawax~ · Accepted solution]

ErrorCheck Property

Syntax

ExpressionEdit.ErrorCheck

Data Type

ErrorCheck

Use the following constants with this data type:

• ErrorCheck_None–(Value: 0) No error checking.
• ErrorCheck_Syntax–(Value: 1) Checks only for syntax errors.
• ErrorCheck_SyntaxAndEvaluation–(Value: 2) Checks for syntax and evaluation errors.

That needs to be set to 2 for your ExpressionEdit box.  Otherwise it won't check the type.  You can do it through a property node or  you can right click on the control in LabVIEW and go to ExpressionEdit>>Properties... then change the ErrorChecking tab.

Hope this helps,

[Roman_L]

Many thx!