Ctypes call to GetDiskFreeSpaceExW

GetDiskFreeSpaceExW.ps1

$k32 = New-CtypesLib Kernel32.dll

$free = $total = $totalFree = [int64]0
$res = $k32.SetLastError().GetDiskFreeSpaceExW(
    $k32.MarshalAs('C:\', 'LPWStr'),
    [ref]$free,
    [ref]$total,
    [ref]$totalFree)
if (-not $res) {
    throw [System.ComponentModel.Win32Exception]::new($k32.LastError)
}