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arrayswindowsbatch-file
Quelklef
Quelklef

Reputation: 2147

Batch nested variables

So, I have some nested variables in Batch.

It's causing me an issue.

The reason I have nested variables is because I am emulating an array via:

array[0]=1
array[1]=2
array[2]=3

etc

Now, I have a counter counter

I want to be able to do %array[!counter!]%, and the output would equal !counter! + 1.

But I can't.

I think it's because having it surrounded in %'s makes Windows try to expand the variable ASAP, and it does, breaking the counter.

So, instead, why not do !array[!counter!]!? Well, I tried this, and I think that, instead of interpreting it as (array[(counter)]), where ()'s are used to show what !!'s are holding, Windows instead interprets it as (array[)counter(), which is useless to me.

Keep in mind: Whenever I use !!'s, assume I have done setlocal EnableDelayedExpansion -- I just don't include it as that would be a pain for both me and readers.

Any ideas how to fix this?

Upvotes: 2

Views: 383

Answers (2)

Quelklef
Quelklef

Reputation: 2147

This is what I ended up doing:

for /l %%a in (1;1;3) do (
    echo !array[%%a]!
)

Originally, I was using a manual counter via variable counter, but using for /l means I can have a counter without having to set it to a variable, and, more importantly, not calling it like !varname!; instead like %%varname, eliminating confusion.

Upvotes: 0

npocmaka
npocmaka

Reputation: 57252

(at least) Two possible ways. The first is faster and more verbose - CALL command hits the performance.

@echo off
setlocal enableDelayedExpansion
set array[0]=1
set array[1]=2
set array[2]=3

set counter=0
echo first way :
for /l %%# in (1;1;3) do (
    for /f %%$ in ("!counter!") do echo   !array[%%$]!


    set /a counter=counter+1

)
set counter=0
echo second way : 
for /l %%# in (1;1;3) do (

    call :subr1 !counter!

    set /a counter=counter+1

)
goto :eof

:subr1
    echo !array[%1]!
goto :eof

Upvotes: 1

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