Question on Exception Trapping

Take a look here:
http://blogs.msdn.com/powershell/arc...and-throw.aspx

"Kuma" <kumasan76@xxxxxx> wrote in message
news:1189172983.689730.144700@xxxxxx
<sarcasm>
I have to admit, I am completely overwhelmed at the extensive
documentation available for PowerShell's exception handling.
</sarcasm>

Got that out of my system now, I have a problem with Trap. I have a
small script which basically takes a list of all computer names on my
part of the network (500 of them) and tries to see which ones have WMI
blocked by the Windows Firewall, which have the wrong admin password
(we change it frequently and miss a computer sometimes). I used
WIN32_LocalTime because its less information to pass across the
network. The problem is that I need two Trap statements. I have one
working, but am having a rough time with the other. Any ideas? Here's
the script. I cannot figure out the exception I need to Trap.

<snip>
$WMI_Comps = List of all computers from AD
$credential = Admin Credentials
foreach ($j in $WMI_Comps)
{
Get-WmiObject Win32_LocalTime -computername $j -ea silentlycontinue
-credential $credential | Foreach {$_.Server}
trap [System.UnauthorizedAccessException]
{$j+' Wrong Admin Password' >> $file;continue}
trap [****************************************************]
{$j+' Windows Firewall Blocking' >> $file;continue}
}

I know the Password one works but I can't get the other to work.
Here's the $error output I want to Trap.

PS » $error[0]
Get-WmiObject : The RPC server is unavailable. (Exception from
HRESULT: 0x800706BA)
At line:1 char:14
+ Get-WmiObject <<<< Win32_LocalTime -computername BLAHBLAH | ForEach-
Object {$_.__Server}

PS » $error[0].exception
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

PS » $error[0].fullyqualifiederrorid
GetWMICOMException,Microsoft.PowerShell.Commands.GetWmiObjectCommand

I've tried to trap just about every variation of
$error[0].fullyqualifiederrorid that i can think of or find. I'll
admit I'm new not only to powershell but to WMI so any ideas are
welcome. Thanks.

<sarcasm>
I have to admit, I am completely overwhelmed at the extensive
documentation available for PowerShell's exception handling.
</sarcasm>

Got that out of my system now, I have a problem with Trap. I have a
small script which basically takes a list of all computer names on my
part of the network (500 of them) and tries to see which ones have WMI
blocked by the Windows Firewall, which have the wrong admin password
(we change it frequently and miss a computer sometimes). I used
WIN32_LocalTime because its less information to pass across the
network. The problem is that I need two Trap statements. I have one
working, but am having a rough time with the other. Any ideas? Here's
the script. I cannot figure out the exception I need to Trap.

<snip>
$WMI_Comps = List of all computers from AD
$credential = Admin Credentials
foreach ($j in $WMI_Comps)
{
Get-WmiObject Win32_LocalTime -computername $j -ea silentlycontinue
-credential $credential | Foreach {$_.Server}
trap [System.UnauthorizedAccessException]
{$j+' Wrong Admin Password' >> $file;continue}
trap [****************************************************]
{$j+' Windows Firewall Blocking' >> $file;continue}
}

I know the Password one works but I can't get the other to work.
Here's the $error output I want to Trap.

PS » $error[0]
Get-WmiObject : The RPC server is unavailable. (Exception from
HRESULT: 0x800706BA)
At line:1 char:14
+ Get-WmiObject <<<< Win32_LocalTime -computername BLAHBLAH | ForEach-
Object {$_.__Server}

PS » $error[0].exception
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

PS » $error[0].fullyqualifiederrorid
GetWMICOMException,Microsoft.PowerShell.Commands.GetWmiObjectCommand

I've tried to trap just about every variation of
$error[0].fullyqualifiederrorid that i can think of or find. I'll
admit I'm new not only to powershell but to WMI so any ideas are
welcome. Thanks.

On Sep 7, 10:49 pm, "Brandon Shell" <tshell.m...@xxxxxx> wrote: Been there. The link to Chapter 11 no longer works. And the sample
chapters available are not Trap and Throw.
I have the basic syntax down. I just cant get the exception to use.

You could just use a genreic trap statement that will catch all exceptions.
--
Richard Siddaway
Please note that all scripts are supplied "as is" and with no warranty
Blog: http://richardsiddaway.spaces.live.com/
PowerShell User Group: http://www.get-psuguk.org.uk


"Kuma" wrote:

I hope this code would work for you.

$WMI_Comps = List of all computers from AD
$credential = Admin Credentials
foreach ($j in $WMI_Comps)
{
Get-WmiObject Win32_LocalTime -computername $j -ErrorVariable
myerror -credential $credential | Foreach {$_.Server}
if ($myerror.count -gt 0)
{
if ($myerror[0].Exception -is
[System.Runtime.InteropServices.COMException])
{$j+' Wrong Admin Password' >> $file;}
elseif ($myerror[0].Exception -is
[System.UnauthorizedAccessException])
{$j+' Windows Firewall Blocking' >> $file;}
}
}

Tao Ma
Best wishes.

Kuma wrote: https://connect.microsoft.com/feedba...7271&SiteID=99


Description
get-help about_execution_environment references another topic called
error_handling, but there is no help for error_handling.
Comments
Thank you for reporting this bug. We will try to incorporate this in the next
release.
Posted by Microsoft on 10/4/2006 at 10:50 AM



--

Hal Rottenberg
blog: http://halr9000.com
powershell category:
http://halr9000.com/article/category...ng/powershell/

On Sep 8, 12:27 am, "Edengundam" <feng_e...@xxxxxx> wrote: That worked great. I never thought of using -errorvariable. I ended up
using a Trap [system.exception] {$z=$null;continue} as well just to
get rid of the bright red error messages. Thanks for the help.