Creating value expressions dynamically with strings and numbers?

[Stjag]

Hello everybody!

I'm having a problem regarding passing arguments (DLL-Adapter) from different locations to a function in TestStand 3.5.

Here is what I have:

FileGlobals.Data.MyArray

and

StationGlobals.Data.MyArray

Which means there are 2 arrays of the same type, one stored in the sequence and one globally. "Data" is just a container.

The type of MyArray is a custom one each element containing a string and a number: Array[n].Name and Array[n].Nr

Now I want to pass (string) arguments of the array to a function using a value expression of: FileGlobals.Data.MyArray[Step.index].Name

Whereas Step.index is a local property (number) of a custom step. It's working well!

Here is the actual problem:

Since I have to sources, FileGlobals OR StationGlobals, I want to specify dynamically which string to pass.

Therefore I introduced a property Step.ThisIsMyScope . It's a string containing either "FileGlobals" or "StationGlobals".

I have been experimenting in expressions like

Step.ThisIsMyScope + ".Data.MyArray[" + Step.index + "].Name"

or Evaluate(...) , etc.

Nothing worked.

I do not want to use the API, though I managed to do things with getValString and temporary saving the Value in the step, but that's not nice nor transparent enough.

May anyone help me?

Thank you very much,

Stefan

[RayFarmer]

Hi,

have you tried Evaluate(Step.ThisIsMyScope + ".Data.MyArray[" + Step.index + "].Name")

or

(Step.ThisIsMyScope == "FileGlobals"  )  ?  (FileGlobals.Data.MyArray[ Step.index].Name)  :  (StationsGlobals.Data.MyArray[ Step.index].Name)

Regards

Ray Farmer

Message Edited by Ray Farmer on 04-05-2007 10:09 AM

[Stjag]

The first one does not work. ("token" error)

The second option is surprisingly good, I even can do something like a switch statement (ok, it's not that good to read, but it works).

So the second work-around is working in my case, although it is not completely dynamic. What if I had wanted to actually "use" the string to build up my expression? Maybe the conditional statement may help me there too, but right now I can't see how?

[RayFarmer]

Hi,

I think you have to do:

Evaluate(Step.ThisIsMyScope + \".Data.MyArray[\" + Step.index + \"].Name\")

so you dont get the token error

Regards

Ray Farmer

[Stjag]

No, that's not working: it says "unexpected token : \"   !

[RayFarmer]

Ok

Evaluate(Step.ThisIsMyScope + ".Data.MyArray[" + Str(Step.index) + "].Name")

The parameter of Evaluate must be a string, and I'm guessing Step.index is a number so convert it to a string.

Regards

Ray Farmer

[Stjag]

Actually that's what I tried first, because it seems quite obvious to me. Unfortunately this leads to : "unexpected token : . "

TestStand does not like the first dot at --->  ".Data.MyArray[" !

If I remove it, the error is gone but then the property is not correct...

[RayFarmer]

Hi,

Should that be Data.MyData or Is it DataMyData?  What is the full structure of Data?

I've just tried a similar example which worked for me using TestStand 2.0

Can You post a small example.

Regards

Ray Farmer

[Stjag]

Here are two examples that show the full structure of the data assuming that we want to get the 3rd element of each array:

FileGlobals.Data.MyArray[3].Name

respectively

StationGlobals.Data.MyArray[3].Name

to clarify it even more:

StationGlobals (Default Top Level)

         |----Data                (container)

                  |-------MyArray        (array of custom type)

The custom type contains:

|----- Name (string)

|----- Nr (number)

I hope it is clear now. How is your structure and the corresponding expression?

[RayFarmer]

Hi,

I'm not seeing the problem you are having.

if you put FileGlobals.Data.MyArray[2].Name in the expression

Locals.expr = Evaluate("FileGlobals.Data.MyArray[2].Name") do you get the expected value returned in Locals.expr.

Regards

Ray Farmer