I have one more variation on my recent theme of working with WMI objects. I wanted to come up with something flexible and re-usable where you could specify a WMI class and some properties and get a custom object with all the classes combined. My solution is a function called New-WmiObject.<\/p>\n<\/p>\n
Function<\/span> New-WMIObject<\/span> {<\/span> \n \n[<\/span>cmdletbinding<\/span>(<\/span>)<\/span>]<\/span> \n \nParam<\/span> (<\/span> \n [<\/span>Parameter<\/span>(<\/span>Position<\/span>=<\/span>0<\/span>,<\/span>ValueFromPipeline<\/span>=<\/span>$True<\/span>,<\/span> \n HelpMessage<\/span>=<\/span>"Enter a computername."<\/span>)<\/span>]<\/span> \n [string[]]<\/span>$computername<\/span>=<\/span>$env:computername<\/span>,<\/span> \n [<\/span>Parameter<\/span>(<\/span>Position<\/span>=<\/span>1<\/span>,<\/span>ValueFromPipeline<\/span>=<\/span>$False<\/span>,<\/span> \n HelpMessage<\/span>=<\/span>"Enter a hashtable of WMI classes and properties."<\/span>,<\/span> \n Mandatory<\/span>=<\/span>$True<\/span>)<\/span>]<\/span> \n [hashtable]<\/span>$hashtable<\/span> \n)<\/span> \n \nBegin<\/span> {<\/span> \n write-verbose<\/span> "Starting $($myinvocation.mycommand)"<\/span> \n}<\/span>#begin<\/span> \n \nProcess<\/span> {<\/span> \n foreach<\/span> (<\/span>$computer<\/span> in<\/span> $computername<\/span>)<\/span> {<\/span> \n #initialize property hash<\/span> \n $properties<\/span>=<\/span>@{<\/span>}<\/span> \n write-verbose<\/span> "Adding $($computer.toUpper()) to `$properties"<\/span> \n $properties<\/span>.<\/span>Add<\/span>(<\/span>"Computer"<\/span>,<\/span>$(<\/span>$computer<\/span>.<\/span>toUpper<\/span>(<\/span>)<\/span>)<\/span>)<\/span> \n foreach<\/span> (<\/span>$hash<\/span> in<\/span> $hashtable<\/span>)<\/span> {<\/span> \n $classes<\/span>=<\/span>$hash<\/span>.<\/span>keys<\/span> \n foreach<\/span> (<\/span>$class<\/span> in<\/span> $classes<\/span>)<\/span> {<\/span> \n write-verbose<\/span> "Getting $class information on $computer"<\/span> \n $wmi<\/span>=<\/span>Get-WmiObject<\/span> -Class<\/span> $class<\/span> -Property<\/span> $hash<\/span>.<\/span>item<\/span>(<\/span>$class<\/span>)<\/span> `\n<\/span> -computername<\/span> $computer<\/span> \n #create array properties if $wmi returned more than one item<\/span> \n if<\/span> (<\/span>$wmi<\/span>.<\/span>count<\/span> -gt<\/span> 1<\/span>)<\/span> {<\/span> \n write-verbose<\/span> "Multiple WMI objects returned"<\/span> \n #initialize a temporary array<\/span> \n $array<\/span>=<\/span>@(<\/span>)<\/span> \n foreach<\/span> (<\/span>$object<\/span> in<\/span> $wmi<\/span>)<\/span> {<\/span> \n Write-Verbose<\/span> "Adding $($object.__RELPATH)"<\/span> \n $array<\/span>+=<\/span>$object<\/span> |<\/span> select<\/span> $hash<\/span>.<\/span>item<\/span>(<\/span>$class<\/span>)<\/span> \n }<\/span>#end foreach $object<\/span> \n #add the array as a property value<\/span> \n #strip off win32_ from the class name<\/span> \n $parsed<\/span>=<\/span>$class<\/span>.<\/span>Substring<\/span>(<\/span>$class<\/span>.<\/span>indexof<\/span>(<\/span>"_"<\/span>)<\/span>+<\/span>1<\/span>)<\/span> \n $properties<\/span>.<\/span>Add<\/span>(<\/span>$parsed<\/span>,<\/span>$array<\/span>)<\/span> \n }<\/span> \n else<\/span> {<\/span> \n #add each property<\/span> \n foreach<\/span> (<\/span>$item<\/span> in<\/span> $hash<\/span>.<\/span>item<\/span>(<\/span>$class<\/span>)<\/span>)<\/span> {<\/span> \n write-verbose<\/span> "Adding $item = $($wmi.($item))"<\/span> \n $properties<\/span>.<\/span>Add<\/span>(<\/span>$item<\/span>,<\/span>$(<\/span>$wmi<\/span>.<\/span>(<\/span>$item<\/span>)<\/span>)<\/span>)<\/span> \n }<\/span> \n }<\/span> #else<\/span> \n }<\/span> #foreach $class<\/span> \n \n }<\/span> #foreach $hash<\/span> \n Write-Verbose<\/span> "Creating custom object"<\/span> \n New-Object<\/span> PSObject<\/span> -Property<\/span> $properties<\/span> \n }<\/span> #foreach $computer<\/span> \n}<\/span> #process<\/span> \n \nEnd<\/span> {<\/span> \n \n write-verbose<\/span> "Ending $($myinvocation.mycommand)"<\/span> \n}<\/span> #end<\/span> \n}<\/span> #end function<\/span><\/pre>\n<\/p>\nThe function takes a computername as either a direct or pipelined value. The default is the local computer. The other value is a hashtable of WMI information. The key is the name of a Win32 WMI class. The value is a comma separated list of properties for that particular class. The function will gather the requested WMI information and write a custom object to the pipeline with each property. This means that you are limited to unique property names in your hashtable. If you have two classes you want to query, each with a property of Version, the function can\u2019t return both values. If someone would like to revise the script to accommodate this that would be great.<\/p>\n
The function works best if the WMI classes return single instances. If the WMI class you want to query will return multiple instances, New-WmiObject will work but it will return a property that contains an array of the objects. For example. here\u2019s a hash table I want to use:<\/p>\n<\/p>\n
$a<\/span>=<\/span>@{<\/span>win32_OperatingSystem<\/span>=<\/span>