Creating value expressions dynamically with strings and numbers?

[Stjag]

Of course I do!
THIS is working even if I'm not accessing the 2nd element with a constant but with a variable! ( FileGlobals.Data.MyArray[Step.Index].Name )

The problem I'm talking about is:

 I can not replace "FileGlobals" with a variable, runtime-given string.

[RayFarmer]

Can you post an example sequencefile highlighting your problem.

Regards

Ray Farmer

[Stjag]

Ok, here we go:

There are 3 Steps (see expressions).

The aim is to get a value from an array which may exist at two different locations. 

Explanation:

The first step is OK as I'm specifying the value expression "path" directly.

The second one is trying to build an expression at runtime using its local "Step.Scope" string ! Same for the third one. They fail because of a syntax error (I' ve tried many ways there, all of them giving a syntax error, so this one only shows the principle of what I want to do).

Please try to rewrite the post expression using "Evaluate(...)", "Step.Index" and "Step.Scope" (without using the conditional operator "?:" ) to create an expression that can get the desired element of the array.

[RayFarmer]

Quick look at your sequencefile:

On the second step you are not changing Step.Index to a string and the second item, dont you need to include Name in the string as Step.MyResult is of type string not Type Info.

[SF.Seq[0].Main[1].TS]
Id = "ID#:UfdOFg1uu0+wU3MUymaGrC"
PostExpr = "Step.MyResult = Evaluate( Step.Scope + \".Data.Array[\" + Step.Index + \"]\")"

It needs to be of the format

[SF.Seq[0].Main[1].TS]
Id = "ID#:UfdOFg1uu0+wU3MUymaGrC"
PostExpr = "Step.MyResult = Evaluate( Step.Scope + \".Data.Array[\" + Str(Step.Index) + \"].Name\")"

Regards

Ray Farmer

[Stjag]

I accidentally forgot the ".Name" in my quick example, you're right.

I have changed my expression to the one you provided. First I got an token error because of the dot ("."). Then I ran the sequence, it worked!

I made the following mistakes that led to my problem:

- providing the Evaluate expression with ' \ ' included, like: Step.Scope + \".Data.Array[\" + Str(Step.Index) + \"].Name\")". Now I'm realizing that this is only the way TS is storing the value! So in the expression box you can write:  Evaluate ( Step.Scope + ".Data.Array[" + Str(Step.Index) + "].Name" )

- confusing the token error "." with a syntax error: The syntax of " Evaluate ( Step.Scope + ".Data.Array[" + Str(Step.Index) + "].Name" )  " was correct, but the property only exists at runtime!

- using Step.Index instead of Str(Step.Index) !!

A very weird mixture of these mistakes have led to the problems I had. Thank you Ray for helping me out so patiently! I'm glad about your help!

Thank you!

[RayFarmer]

That's ok, still got a bit of hair left

Regards

Ray Farmer