Vista - Error checking with WMI Lastreboot script

I have the following script that I am working on creating to grab the
last reboot day of all the machines on my network so I can watch for
machines/users that might need a gentle nudge to reboot for patches to
be installed.

# define a string array variable that hold the computer names
$machines = get-qadcomputer -searchroot "mydomain.com/Lancaster
Computers" |Sort-Object name | foreach {$_.name}

#Get Wmi Data for specific machine
gwmi -Class Win32_OperatingSystem -errorAction "silentlyContinue" -
ComputerName $Machines |
select csname,
@{n="LastBootUpTime";e={$_.converttodatetime($_.lastbootuptime)}}



I get the following error:

Access is denied. (Exception from HRESULT: 0x80070005
(E_ACCESSDENIED))
At line 11, position 5
gwmi -Class Win32_OperatingSystem -errorAction "silentlyContinue" -
ComputerName $Machines |

I thought the -errorAction silentlycontinue would skip by errors. I
guess I was wrong. Is there a way to get it to list the machine name,
an error text message and then move on?

TIA.

Tim

"TimParker" <timpar@xxxxxx> wrote in message
news:d6550cd5-0e03-44b5-a35e-b25c905da689@xxxxxx
You could loop through the individual machines, and make use of the
automatic variable $?, which tests whether a previous line is successful or
not. (Using 'Trap' statements would also be a similar route) ....

#---------------------------------
$Machines = (".","NoSuchMachine","localhost")
foreach ($Machine in $Machines) {


gwmi -Class Win32_OperatingSystem -errorAction
"silentlyContinue" -ComputerName $Machine |
select
csname,@{n="LastBootUpTime";e={$_.converttodatetime($_.lastbootuptime)}}

if (-not($?)){Write-Host "ERROR: $Machine `n$($error[0].ToString())"}

}
#---------------------------------


Output ....

PS (1) > $Machines = (".","NoSuchMachine","localhost")
PS (2) > foreach ($Machine in $Machines) {e |csname LastBootUpTime
------ --------------
ABCD 19/06/2008 06:19:16
ERROR: NoSuchMachine
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)
ABCD 19/06/2008 06:19:16


PS (3) >


--
Jon