Get-ADComputer -filter * | Select -expand Name | Get-ServerInfo in Visual Basic .NET

Creator DataMatrix in Visual Basic .NET Get-ADComputer -filter * | Select -expand Name | Get-ServerInfo

Get-ADComputer -filter * | Select -expand Name | Get-ServerInfo
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That will retrieve all computers from Active Directory, expand their Name properties into simple String objects, and pipe those String objects to the Get-ServerInfo function. You could also add additional parameters, by including a standard Param() block right at the top of the function, before the BEGIN block. Whatever values are passed to those parameters will hold the same values each time the PROCESS block executes. That brings up an interesting problem: what if you want the cmdlet to accept computer names either from the pipeline or from a parameter In other words, you want both of these to work:
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Get-Content names.txt | Get-ServerInfo Get-ServerInfo -computername (Get-Content names.txt)
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Right now, the function won t do that, because we don t have a -computername parameter defined. The only input expected is that coming from the pipeline. So let s add a parameter, as shown next.
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Listing 21.2 Adding a parameter to a filtering function
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function Get-ServerInfo { param ( [string]$computername )
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Functions that work in the pipeline
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BEGIN {} PROCESS { $computername = $_ $os = Get-WmiObject Win32_OperatingSystem -computer $computername $disk = Get-WmiObject Win32_LogicalDisk -filter "DeviceID='C:'" ` -computer $computername $obj = New-Object -TypeName PSObject $obj | Add-Member -MemberType NoteProperty ` -Name ComputerName -Value $computername $obj | Add-Member -MemberType NoteProperty ` -Name BuildNumber -Value ($os.BuildNumber) $obj | Add-Member -MemberType NoteProperty ` -Name SPVersion -Value ($os.ServicePackMajorVersion) $obj | Add-Member -MemberType NoteProperty ` -Name SysDriveFree -Value ($disk.free / 1MB -as [int]) Write-Output $obj } END {} } Get-Content names.txt | Get-ServerInfo | Format-Table -auto
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Now, however, we run into a problem. The original way of running the command which is included at the bottom of the script listing will continue to work. It produces output that looks like this (assuming names.txt contained SERVER-R2 and localhost):
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ComputerName -----------server-r2 localhost BuildNumber ----------7600 7600 SPVersion --------0 0 SysDriveFree -----------0 0
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But the other way of running the function doesn t work:
Get-ServerInfo -computername (Get-Content c:\names.txt) Get-WmiObject : Cannot validate argument on parameter 'ComputerName'. The argum ent is null or empty. Supply an argument that is not null or empty and then try the command again. At line:9 char:60 + $os = Get-WmiObject Win32_OperatingSystem -computer <<<< $computerna me + CategoryInfo : InvalidData: (:) [Get-WmiObject], ParameterBindi ngValidationException
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+ FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.Power Shell.Commands.GetWmiObjectCommand Get-WmiObject : Cannot validate argument on parameter 'ComputerName'. The argum ent is null or empty. Supply an argument that is not null or empty and then try the command again. At line:12 char:19 + -computer <<<< $computername + CategoryInfo : InvalidData: (:) [Get-WmiObject], ParameterBindi ngValidationException + FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.Power Shell.Commands.GetWmiObjectCommand
ComputerName ------------
BuildNumber -----------
SPVersion ---------
SysDriveFree ------------
Ouch. Lots of ugly errors. Here s the problem: all of the code in the function lives within the PROCESS block. We re taking the computer name from the $_ placeholder, which is populated with an object from the pipeline input. Except that we didn t pipe anything in, so the PROCESS block only executes once, and $_ never contains anything, so $computername never contains anything, so nothing works. Sigh. You need to break the function into two pieces. That way, the main working part can stand alone and can be used whether you re getting input from the pipeline or from a parameter. That part will be a behind-the-scenes function that won t be called directly what I call a worker function. The second part will be the public function that you want people to actually use. Its whole job will be to figure out where input is coming from, and then to pass one computer name at a time to the worker function. You need to keep a couple of things in mind:
When input comes from the pipeline, the shell will enumerate through the objects automatically, allowing you to work with one at a time. That s what listing 21.1 did. You can pass those objects, as they re processed, to the worker function. When input comes from a parameter, you may have either one object or many objects, but the PROCESS script block will only execute once regardless. So you ll have to manually enumerate, or unwind, the parameter so that you can get to each object, one at a time.
Here s the trick: PowerShell has a built-in variable called $PSBoundParameters, and it contains each parameter that was manually specified. It has a ContainsKey() method that will let you test to see if a particular parameter was used or not.
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