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Asked: 2014-08-05 06:34:39 +0800 CST

I am getting Invalid class errors for my PowerShell script

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When I run this script, I get this error

Get-WmiObject : Invalid class “Msvm_ImageManagementService”

and

Get-WmiObject : Invalid class "MSPower_DeviceEnable"

and

Get-WmiObject : Invalid class "MSPower_DeviceWakeEnable"

The above errors only occur on some computers and not on others.

$computerlist = Get-Content F:\Code\powershell\network_shutdown\computer-list.csv

foreach ($computer in $computerlist) 
{
    # Main Processing Section
    # Write-Host $computer
    if((Test-Connection -Cn $computer -BufferSize 16 -Count 1 -ea 0 -quiet))
    {
        Write-Host $computer
        Write-Host "Disable `"Allow the computer to turn off this device to save power`""
        Get-WmiObject -computername $computer Win32_NetworkAdapter -filter "AdapterTypeId=0" | % {
            $strNetworkAdapterID=$_.PNPDeviceID.ToUpper()
            Get-WmiObject -class MSPower_DeviceEnable -computername $computer -Namespace $namespace | % {
                if($_.InstanceName.ToUpper().startsWith($strNetworkAdapterID))
                {
                    $_.Enable = $false
                    $_.Put() | Out-Null
                }
            }
        }

        Write-Host "Disable `"Allow this device to wake the computer`""
        Get-WmiObject -computername $computer Win32_NetworkAdapter -filter "AdapterTypeId=0" | % {
            $strNetworkAdapterID=$_.PNPDeviceID.ToUpper()
            Get-WmiObject -class MSPower_DeviceWakeEnable -computername $computer -Namespace $namespace | % {
                if($_.InstanceName.ToUpper().startsWith($strNetworkAdapterID)){
                    $_.Enable = $false
                    $_.Put() | Out-Null
                }
            }
        }

        Write-Host "Disable `"Only allow a magic packet to wake the computer`""
        Get-WmiObject -computername $computer Win32_NetworkAdapter -filter "AdapterTypeId=0" | % {
            $strNetworkAdapterID=$_.PNPDeviceID.ToUpper()
            Get-WmiObject -class MSNdis_DeviceWakeOnMagicPacketOnly -computername $computer -Namespace $namespace | % {
                if($_.InstanceName.ToUpper().startsWith($strNetworkAdapterID)){
                    $_.EnableWakeOnMagicPacketOnly = $false
                    $_.Put() | Out-Null
                }
            }
        }
    } else {
        Write-Host $computer + " OFFLINE"
        $output = new-object psobject
        $output | Add-Member noteproperty ComputerName $computer

        $array += $output
    }

    $array | Export-Csv -Path F:\Code\powershell\network_shutdown\Results.csv
}

How can I fix the namespace so that I can target all computers?

My error logging isn't working either. What can I do to get the OFFLINE and FAILED and SUCCESS into a CSV file? (I am aware that in my code above, I am only capturing the offline ones but that doesn't work either)

I get the following

Method invocation failed because [System.Management.Automation.PSObject] doesn't contain a method named 'op_Addition'.

The code is running on Windows 7

PowerShell Version

Major  Minor  Build  Revision
-----  -----  -----  --------
2      0      -1     -1
powershell

1 Answers

  1. Get-WmiObject : Invalid class “Msvm_ImageManagementService”

    This class is exposed by the Hyper-V WMI provider. If you don't have Hyper-V or Hyper-V Management tools installed on the target machine, this class won't be there

    Get-WmiObject : Invalid class "MSPower_*"

    The MSPower superclass is not officially supported, and the derivated _Device* classes is not exposed unless an installed network adapter supports Wake-on-LAN

    Method invocation failed because [System.Management.Automation.PSObject] doesn't contain a method named 'op_Addition'.

    is probably caused by the following line:

    $array += $output

    If $array does not already exist, PowerShell cannot automatically infer that you would like it to be an array of PSObjects - PowerShell then tries to use the type of the object on the right-hand side of the "Addition operator" (+), and correctly fails because PSObject supports no such operation.

    Add the following at the start of your script:

    $array = @()

    To initialize an empty array, or indicate the desired type with an explicit cast:

    [PSObject[]]$array += $output
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