Public/Get-Visitor.ps1

<#
    .SYNOPSIS
    Gets a visitor.

    .DESCRIPTION
    Gets all visitors or a single visitor if a visitor id is specified. If the result return null, try the parameter "-Verbose" to get more details.
    
    .EXAMPLE
    Get-Visitor
    
    LastChanged : 19/10/2017 11:29:03
    OfficePhoneNumber :
    Extension :
    Server : SERVER
    Lastname : John
    PersonID : 1
    ZipCode :
    TitleID :
    Organization :
    Class : Lnl_Visitor
    Firstname :
    State :
    Credential :
    SSNO :
    ComputerName : SERVER
    City :
    Address :
    PhoneNumber :
    Path : \\SERVER\root\OnGuard:Lnl_Visitor.ID=1
    Midname :
    SuperClass : Lnl_Person
    
    .LINK
    https://github.com/erwindevreugd/PSDataConduIT
#>

function Get-Visitor
{
    [CmdletBinding()]
    param
    (
        [Parameter(
            Position=0, 
            Mandatory=$false, 
            ValueFromPipelineByPropertyName=$true,
            HelpMessage='The name of the server where the DataConduIT service is running or localhost')]
        [string]$Server = $Script:Server,
        
        [Parameter(
            Position=1,
            Mandatory=$false, 
            ValueFromPipelineByPropertyName=$true,
            HelpMessage='The credentials used to authenticate the user to the DataConduIT service')]
        [PSCredential]$Credential = $Script:Credential,

        [Parameter(
            Mandatory=$false, 
            ValueFromPipelineByPropertyName=$true,
            HelpMessage='The visitor id paramter')]
        [int]$VisitorID
    )

    process {
        $query = "SELECT * FROM Lnl_Visitor WHERE __CLASS='Lnl_Visitor'"

        if($VisitorID) {
            $query += " AND ID=$VisitorID"
        }

        LogQuery $query

        $parameters = @{
            ComputerName=$Server;
            Namespace=$Script:OnGuardNamespace;
            Query=$query
        }

        if($Credential -ne $null) {
            $parameters.Add("Credential", $Credential)
        }

        Get-WmiObject @parameters | ForEach-Object { New-Object PSObject -Property @{
                Class=$_.__CLASS;
                SuperClass=$_.__SUPERCLASS;
                Server=$_.__SERVER;
                ComputerName=$_.__SERVER;
                Path=$_.__PATH;
                Credential=$Credential;
            
                PersonID=$_.ID;
                TitleID=$_.TITLE;
                Firstname=$_.FIRSTNAME;
                Lastname=$_.LASTNAME;
                Midname=$_.MIDNAME;    
                LastChanged=ToDateTime $_.LASTCHANGED;
                Organization=$_.ORGANIZATION;
                Extension=$_.EXT;
                OfficePhoneNumber=$_.OPHONE;
                PhoneNumber=$_.PHONE;
                SSNO=$_.SSNO;
                Address=$_.ADDR1;
                State=$_.STATE;
                City=$_.CITY;
                ZipCode=$_.ZIP
            }
        }
    }
}