Powershell - Store all Computers in AD into Array - powershell

Question

So at the moment I have some code which can lock down to a specific OU via ADSI in Powershell, loop through, and store them into an Array. In turn I loop through this and run a Test-Connection. I have my reasons...
Anyway, is it possible (using only inbuilt cmdlets, i.e. no Quest stuff) to recurse through the whole of AD and add all Computer Objects to the array?
$myArrayOfComputers = #()
$orgUnit = [ADSI]"LDAP://OU=foo,DC=foo,dc=co,dc=uk"
ForEach($child in $orgUnit.psbase.Children) {
if ($child.ObjectCategory -like '*computer*') { $myArrayOfComputers += $child.Name }
}
ForEach($i in $myArrayOfComputers) {
Test-Connection $i
}

Answer 1

In PowerShell V2.0 you can try :
Import-module ActiveDirectory
$computers = Get-ADComputer *
In PowerShell V1.0 You can try :
# dom.fr is the DNS root name of the domain
$dn = New-Object System.DirectoryServices.DirectoryEntry ("LDAP://dom.fr:389/dc=dom,dc=fr","administrator#dom.fr","admin")
# Look for computers
$Rech = new-object System.DirectoryServices.DirectorySearcher($dn)
$Rech.filter = "((objectClass=computer))"
$Rech.SearchScope = "subtree"
$Rech.PropertiesToLoad.Add("sAMAccountName");
$Rech.PropertiesToLoad.Add("lastLogon");
$Rech.PropertiesToLoad.Add("distinguishedname");
$computers = $Rech.findall()

Answer 2

On V2 using .net:
Add-Type -AssemblyName System.DirectoryServices.AccountManagement | out-null
$ct = [System.DirectoryServices.AccountManagement.ContextType]::Domain
$pc = new-object 'System.DirectoryServices.AccountManagement.PrincipalContext'($ct, "foo.co.uk", "OU=foo,DC=foo,dc=co,dc=uk");
$cpp = New-Object 'System.DirectoryServices.AccountManagement.Computerprincipal'($pc)
$ps = new-object 'System.DirectoryServices.AccountManagement.PrincipalSearcher'
$ps.QueryFilter = $cpp
$MyListArray = $ps.FindAll() | select -expa name