I am using Powershell to query WMI objects.  Some objects like Win32_LogicalDisk,  return an array of objects when there is more than 1 drive on a machine.  However,  when there is only 1 drive it apparently it returns the object to the variable and does not make the variable an array.

My question:  How do I test a variable (or returned object) in PS to see if it is an array or not?

 

Thanks,

-MattG

Figured it out:

$srv = gwmi win32_LogicalDisk -computer $name -filter "DriveType = 3"
   
        if ($srv.Count -gt 1){
            $srv[0]| select $field1,$field2,$field3,$field4,$field5
            $srv[1]| select $field1,$field6,$field7,$field8,$field9
            $srv[2]| select $field1,$field10,$field11,$field12,$field13
            $srv[3]| select $field1,$field14,$field15,$field16,$field17
            $srv[4]| select $field1,$field18,$field19,$field20,$field21
            } else
            {
            $srv|select $field1,$field2,$field3,$field4,$field5
            }
 }

Thanks,

-MattG

Your message appears to be formatted very strangely. I'm looking into that. As to your question, you can either a) test it or b) use constructs which will work whether the obj is an array or singleton.

a1) if ( $foo.GetType().BaseType -eq 'array' )
a2) if ( $foo -is [system.array] ) # -isnot is the opposite

b)
$a = get-wmiobject win32_logicaldisk
$a | foreach-object { DoStuff }

Well, the Count method doesn't even exist on non-arrays, so you could just say

if ( $foo.count ) { DoStuff }

But I don't think this is the best way to handle the case. There's several options.