where can i find the Get-WmiObject file location in powershell? - windows

Question

I would like to change some code in the Get-wmiObject file itself to do some functionality for me and replace some others. most important thing is to change some command output for some reason. how can i do that or is it possible ?

Answer 1

As Santiago pointed out, proxy functions would be the right choice for modifying native code behaviour.
Step 1: Generate the proxy function
You can do this by:
$Command = Get-Command -Name Get-WmiObject
$ProxyFunction = [System.Management.Automation.ProxyCommand]::Create($Command)
$ProxyFunction | Out-File 'C:\temp\Proxy.ps1' -Force
The above will generate parameters for the Get-WmiObject plus the "calling mechanism" for the Get-WmiObject command, in C:\temp\Proxy.ps1
Step 2: Write your code
You can now write wrapper code. In the below example, I wrote some code to display PowerShell version (in the verbose stream) along with the original output.
Original working:
> Get-WmiObject win32_operatingsystem
SystemDirectory : C:\Windows\system32
Organization :
BuildNumber : 1234
RegisteredUser : 1234
SerialNumber : 1234
Version : 1.2.3.4
Proxy function working:
> Get-WmiObject win32_operatingsystem
SystemDirectory : C:\Windows\system32
Organization :
BuildNumber : 1234
RegisteredUser : 1234
SerialNumber : 1234
Version : 1.2.3.4
VERBOSE: PowerShell version is: 5.1.19041.1682
Full code can be found below. Keep in mind, most of the code was generated from step 1. I just added the output from step 1, plus my custom code into a function with the same name as the original function we're proxying.
If you want this function to be available as soon as you open a new PowerShell window, put it in your $PROFILE.
function Get-WmiObject
{
[CmdletBinding(DefaultParameterSetName='query', HelpUri='https://go.microsoft.com/fwlink/?LinkID=113337', RemotingCapability='OwnedByCommand')]
param(
[Parameter(ParameterSetName='query', Mandatory=$true, Position=0)]
[Parameter(ParameterSetName='list', Position=1)]
[Alias('ClassName')]
[string]
${Class},
[Parameter(ParameterSetName='list')]
[switch]
${Recurse},
[Parameter(ParameterSetName='query', Position=1)]
[string[]]
${Property},
[Parameter(ParameterSetName='query')]
[string]
${Filter},
[switch]
${Amended},
[Parameter(ParameterSetName='query')]
[Parameter(ParameterSetName='WQLQuery')]
[switch]
${DirectRead},
[Parameter(ParameterSetName='list')]
[switch]
${List},
[Parameter(ParameterSetName='WQLQuery', Mandatory=$true)]
[string]
${Query},
[switch]
${AsJob},
[Parameter(ParameterSetName='class')]
[Parameter(ParameterSetName='path')]
[Parameter(ParameterSetName='WQLQuery')]
[Parameter(ParameterSetName='query')]
[Parameter(ParameterSetName='list')]
[System.Management.ImpersonationLevel]
${Impersonation},
[Parameter(ParameterSetName='path')]
[Parameter(ParameterSetName='class')]
[Parameter(ParameterSetName='WQLQuery')]
[Parameter(ParameterSetName='query')]
[Parameter(ParameterSetName='list')]
[System.Management.AuthenticationLevel]
${Authentication},
[Parameter(ParameterSetName='path')]
[Parameter(ParameterSetName='class')]
[Parameter(ParameterSetName='WQLQuery')]
[Parameter(ParameterSetName='query')]
[Parameter(ParameterSetName='list')]
[string]
${Locale},
[Parameter(ParameterSetName='WQLQuery')]
[Parameter(ParameterSetName='class')]
[Parameter(ParameterSetName='path')]
[Parameter(ParameterSetName='query')]
[Parameter(ParameterSetName='list')]
[switch]
${EnableAllPrivileges},
[Parameter(ParameterSetName='query')]
[Parameter(ParameterSetName='class')]
[Parameter(ParameterSetName='WQLQuery')]
[Parameter(ParameterSetName='path')]
[Parameter(ParameterSetName='list')]
[string]
${Authority},
[Parameter(ParameterSetName='path')]
[Parameter(ParameterSetName='class')]
[Parameter(ParameterSetName='WQLQuery')]
[Parameter(ParameterSetName='query')]
[Parameter(ParameterSetName='list')]
[pscredential]
[System.Management.Automation.CredentialAttribute()]
${Credential},
[int]
${ThrottleLimit},
[Parameter(ParameterSetName='WQLQuery')]
[Parameter(ParameterSetName='class')]
[Parameter(ParameterSetName='path')]
[Parameter(ParameterSetName='query')]
[Parameter(ParameterSetName='list')]
[Alias('Cn')]
[ValidateNotNullOrEmpty()]
[string[]]
${ComputerName},
[Parameter(ParameterSetName='class')]
[Parameter(ParameterSetName='WQLQuery')]
[Parameter(ParameterSetName='query')]
[Parameter(ParameterSetName='list')]
[Parameter(ParameterSetName='path')]
[Alias('NS')]
[string]
${Namespace})
begin
{
try {
$outBuffer = $null
if ($PSBoundParameters.TryGetValue('OutBuffer', [ref]$outBuffer))
{
$PSBoundParameters['OutBuffer'] = 1
}
$wrappedCmd = $ExecutionContext.InvokeCommand.GetCommand('Microsoft.PowerShell.Management\Get-WmiObject', [System.Management.Automation.CommandTypes]::Cmdlet)
$scriptCmd = {& $wrappedCmd #PSBoundParameters }
$steppablePipeline = $scriptCmd.GetSteppablePipeline($myInvocation.CommandOrigin)
$steppablePipeline.Begin($PSCmdlet)
} catch {
throw
}
}
process
{
if ($Class -eq 'win32_operatingsystem')
{
Write-Verbose -Message "PowerShell version is: $($PSVersionTable.PSVersion)" -Verbose
}
try {
$steppablePipeline.Process($_)
} catch {
throw
}
}
end
{
try {
$steppablePipeline.End()
} catch {
throw
}
}
<#
.ForwardHelpTargetName Microsoft.PowerShell.Management\Get-WmiObject
.ForwardHelpCategory Cmdlet
#>
}