Powershell : passing parameters to a function

Question

I'm trying to create a function which takes two parameters and do some repetitive tasks, but the execution fails : Here is the function :

Function RenameFolderFiles{
    param(
        [String[]]$FldPath, [String]$TypeFld
    )
    
    Write-Host $TypeFld " : " $FldPath.Length
    Write-Host $FldPath
    for ( $i = 0; $i -lt $FldPath.Length; $i++ ) {
        write-host $i " : " $FldPath.FullName[$i]
        $NewFld = ([string]$FldPath.FullName[$i]).Replace(" _ tt","");
    }
}

I call the function like this :

$Fld = Get-ChildItem -Path "$varCheminRepertoireScript" -Recurse -Directory | Where-Object {$_.FullName -like "* _ tt*"}

RenameFolderFiles -FldPath $Fld -TypeFld "Nb of Folders & Sub-Folders"

But the result is :

.
.
.
Cannot index into a null array.
At C:\Test.ps1:10 char:9
+         write-host $i " : " $FldPath.FullName[$i]
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : NullArray

What is wrong with the parameters / types passed ? Thanks for your clarifications !! BR

What's the last output written to the screen immediately before the error is thrown? Does it happen on the first iteration, or later? — Mathias R. Jessen
– Mathias R. Jessen, Commented Sep 30, 2022 at 9:40
Thanks Mathias, It happens on the first iteration. Here is the result ``` Nb of Folders & Sub-Folders : 24 Conve... #here is the printout of $FldPath which is too long for this response Cannot index into a null array. At C:\Files_2022\Privé\PowerShell\Rename_s-lib.org_files_S_220930.ps1:67 char:9 + write-host $i " : " $FldPath.FullName[$i] + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [], RuntimeException + FullyQualifiedErrorId : NullArray And the rest of the output is similar for all 24 values — StartingPS
– StartingPS, Commented Sep 30, 2022 at 11:25
Are you by any chance using PowerShell 2.0 or 3.0? You can check the version by inspecting $PSVersionTable — Mathias R. Jessen
– Mathias R. Jessen, Commented Sep 30, 2022 at 11:37

ABC DEF · Accepted Answer · 2022-09-30 12:52:43Z

1

There is No property like FullName on string[] $FldPath or on $FldPath[0] index Item $FldPath.FullName

set [object[]]$FldPath instead of [String[]]$FldPath in param of Function

edited Sep 30, 2022 at 12:52

answered Sep 30, 2022 at 9:58

ABC DEF

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4 Comments

iRon Over a year ago

I think you're right, but your answer is poor with a statement as "Check your code again" (it is more like a comment). Please add some explanation and background to it.

StartingPS Over a year ago

Thanks ABC DEF for the answer. But when I check the $FldPath.Length, it reports 24 (in my test). How can I address these 24 different values in $FldPath ?

Mathias R. Jessen Over a year ago

@StartingPS $FldPath[$i].FullName

ABC DEF Over a year ago

set [object[]]$FldPath instead of [String[]]$FldPath in param of Function

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