[PRTG] Get Counters

# ___ ___ _____ ___
#| _ \ _ \_   _/ __|
#|  _/   / | || (_ |
#|_| |_|_\ |_| \___|
#    NETWORK MONITOR
#-------------------
# Description: Reads performance counters from a file, retrieves them and puts them into channels
# ------------------
# (c) 2015 Stephan Linke | Paessler AG
Param(
        [string]$Computername,
        [string]$CounterFile = "counter-cpu.dat" )

#Variables
[string]$CounterBasePath = "C:\temp\"
[string]$CounterPath = $CounterBasePath + $CounterFile
[int]$i = 1

# lets test the connection first
If(!(Test-Connection -Count 1 -Quiet $Computername)) { Write-Host "<prtg><error>1</error><text>Host not found.</text></prtg>"; exit 2; }

# create a new counter list
$CounterList =  New-Object System.Collections.ArrayList

# retrieve the counters and add them to the list
$Counters = (Get-Content -Path $CounterPath | ConvertFrom-Csv -Delimiter ";")

# add the path from the csv to an array list so we can use it with get-counter
$Counters | ForEach-Object { $CounterList.Add($_.Path)} | Out-Null

# retrieve the counters
$ResultSet = (Get-Counter -ComputerName $Computername -Counter $CounterList)

# add the values to the corresponding counter object
Foreach($Result in $ResultSet.CounterSamples){
    $Counters | Where {$_.ID -eq $i } | Add-Member "Value" $Result.CookedValue
    $i++;
}

Write-Host "<?xml version='1.0' encoding='UTF-8' ?><prtg>";
Foreach ($Counter in $Counters){
Write-Host @"
  <result>
  <channel>$($Counter.FriendlyName)</channel>
  <value>$($Counter.Value)</value>
  <unit>$($Counter.Unit)</unit>
  <float>$($Counter.Float)</float>
  </result>
"@
}
Write-Host "</prtg>";