Chapters/converting-a-function-to-a-class/Start.ps1
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function Get-MachineInfo { <# .SYNOPSIS Retrieves specific information about one or more computers, using WMI or CIM. .DESCRIPTION This command uses either WMI or CIM to retrieve specific information about one or more computers. You must run this command as a user who has permission to remotely query CIM or WMI on the machines involved. You can specify a starting protocol (CIM by default), and specify that, in the event of a failure, the other protocol be used on a per-machine basis. .PARAMETER ComputerName One or more computer names. When using WMI, this can also be IP addresses. IP addresses may not work for CIM. .PARAMETER LogFailuresToPath A path and filename to write failed computer names to. If omitted, no log will be written. .PARAMETER Protocol Valid values: Wsman (uses CIM) or Dcom (uses WMI). Will be used for all machines. "Wsman" is the default. .PARAMETER ProtocolFallback Specify this to automatically try the other protocol if a machine fails. .EXAMPLE Get-MachineInfo -ComputerName ONE,TWO,THREE This example will query three machines. .EXAMPLE Get-ADUser -filter * | Select -Expand Name | Get-MachineInfo This example will attempt to query all machines in AD. #> [CmdletBinding()] Param( [Parameter(ValueFromPipeline=$True, Mandatory=$True)] [Alias('CN','MachineName','Name')] [string[]]$ComputerName, [string]$LogFailuresToPath, [ValidateSet('Wsman','Dcom')] [string]$Protocol = "Wsman", [switch]$ProtocolFallback ) BEGIN {} PROCESS { foreach ($computer in $computername) { if ($protocol -eq 'Dcom') { $option = New-CimSessionOption -Protocol Dcom } else { $option = New-CimSessionOption -Protocol Wsman } Try { Write-Verbose "Connecting to $computer over $protocol" $params = @{'ComputerName'=$Computer 'SessionOption'=$option 'ErrorAction'='Stop'} $session = New-CimSession @params Write-Verbose "Querying from $computer" $os_params = @{'ClassName'='Win32_OperatingSystem' 'CimSession'=$session} $os = Get-CimInstance @os_params $cs_params = @{'ClassName'='Win32_ComputerSystem' 'CimSession'=$session} $cs = Get-CimInstance @cs_params $sysdrive = $os.SystemDrive $drive_params = @{'ClassName'='Win32_LogicalDisk' 'Filter'="DeviceId='$sysdrive'" 'CimSession'=$session} $drive = Get-CimInstance @drive_params $proc_params = @{'ClassName'='Win32_Processor' 'CimSession'=$session} $proc = Get-CimInstance @proc_params | Select-Object -first 1 Write-Verbose "Closing session to $computer" $session | Remove-CimSession Write-Verbose "Outputting for $computer" $obj = [pscustomobject]@{'ComputerName'=$computer 'OSVersion'=$os.version 'SPVersion'=$os.servicepackmajorversion 'OSBuild'=$os.buildnumber 'Manufacturer'=$cs.manufacturer 'Model'=$cs.model 'Procs'=$cs.numberofprocessors 'Cores'=$cs.numberoflogicalprocessors 'RAM'=($cs.totalphysicalmemory / 1GB) 'Arch'=$proc.addresswidth 'SysDriveFreeSpace'=$drive.freespace} Write-Output $obj } Catch { Write-Warning "FAILED $computer on $protocol" # Did we specify protocol fallback? # If so, try again. If we specified logging, # we won't log a problem here - we'll let # the logging occur if this fallback also # fails If ($ProtocolFallback) { If ($Protocol -eq 'Dcom') { $newprotocol = 'Wsman' } else { $newprotocol = 'Dcom' } #if protocol Write-Verbose "Trying again with $newprotocol" $params = @{'ComputerName'=$Computer 'Protocol'=$newprotocol 'ProtocolFallback'=$False} If ($PSBoundParameters.ContainsKey('LogFailuresToPath')){ $params += @{'LogFailuresToPath'=$LogFailuresToPath} } #if logging Get-MachineInfo @params } #if protocolfallback # if we didn't specify fallback, but we # did specify logging, then log the error, # because we won't be trying again If (-not $ProtocolFallback -and $PSBoundParameters.ContainsKey('LogFailuresToPath')){ Write-Verbose "Logging to $LogFailuresToPath" $computer | Out-File $LogFailuresToPath -Append } # if write to log } #try/catch } #foreach } #PROCESS END {} } #function Get-MachineInfo -ComputerName localhost |