Get join information with PowerShell – the hard way

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Why make it simple when you can make it the hard way?
– Because you can? 🙂

The reason for why I needed this is not relevant, but the options when you get information from your computer is. Quite often there are multiple ways to get information: Pure PowerShell commands, registry, environment variables, running cmd/3rd party commands, or Windows API/C# code.

To demonstrate I wrote alternative ways of getting the information of what domain or workgroup the computer is a member of, happy PowerShell coding

PowerShell

Get-ComputerInfo | fl CsDomain

Windows API/C# code wrapped in Powershell


Add-Type -TypeDefinition @"
namespace PInvoke {
    public enum NetJoinStatus
    {
        NetSetupUnknownStatus = 0,
        NetSetupUnjoined,
        NetSetupWorkgroupName,
        NetSetupDomainName
    }
}
"@;

$NetGetJoinInformation = @'
[DllImport("Netapi32.dll", CharSet=CharSet.Unicode, SetLastError=true)]
public static extern int NetGetJoinInformation(
    string server, 
    out IntPtr domain,
    out int status);
'@

$args1 = $null
$args2 = [IntPtr]::Zero
$args3 = New-Object PInvoke.NetJoinStatus;

$type = Add-Type -MemberDefinition $NetGetJoinInformation -Name NetJoin -Namespace Test -PassThru

$retValue = $type::NetGetJoinInformation($args1, [ref] $args2, [ref] $args3);

if ($retValue -eq 0) {
    Write-Host "Success"

    switch ($args3.ToString())
    {
        $([PInvoke.NetJoinStatus]::NetSetupUnknownStatus.value__) { Write-Host ([PInvoke.NetJoinStatus]::NetSetupUnknownStatus); continue  }
        $([PInvoke.NetJoinStatus]::NetSetupUnjoined.value__) { Write-Host ([PInvoke.NetJoinStatus]::NetSetupUnjoined); continue }
        $([PInvoke.NetJoinStatus]::NetSetupDomainName.value__) { Write-Host "$([PInvoke.NetJoinStatus]::NetSetupDomainName): $([System.Runtime.InteropServices.Marshal]::PtrToStringAuto($args2))"; continue }
        $([PInvoke.NetJoinStatus]::NetSetupWorkgroupName.value__) { Write-Host "$([PInvoke.NetJoinStatus]::NetSetupWorkgroupName): $([System.Runtime.InteropServices.Marshal]::PtrToStringAuto($args2))"; continue }
        Default { write-host "Only errors" }
    }

}
else
{
    Write-Host "Error: I did not include any error control here :)";
}

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