Why is this giving me an error in Test Stand 3.5?

[VisualMath]

Why is this giving me an error in Test Stand 3.5?  All parameters exist.

RunState.NextStep.Limits.String = Mid( Parameters.WriteData, Find( Parameters.WriteData,   " ", 0, false, false ))

[RayFarmer]

Hi,

If there in no match with your find() it returns -1, and you cannot have -1 as the start index for the Mid()

Regards

Ray Farmer

[VisualMath]

Thanks.  So I can pass a variable that could have -1, but not use a functrion that could return -1. 

[RayFarmer]

Hi,

whether you have a variable whose value is -1 or use the return value of a function which is -1, if you use it for the Start Index of the Mid() function an error will be generated.

regards

Ray Farmer

[VisualMath]

yes, but not during edit time (only run time).  I expected it to fail during run time.

[RayFarmer]

Ah,

Ignore the error at edit time because parts of the expression are undefined at edit time and only available at runtime.

Regards

Ray Farmer