Trap about Gwmi

I use the following statement and the computer is off,but it can't trap the
error that the gwmi generats(the error is "the RPC server is unavailable).

trap{"ERROR"} $a = gwmi -class win32_networkadapter -computer
"My_Dead_Computer_Name"

Is this the problem of error scope ?

Thanks a lot!

As this does not generate an exception, the error is catched by the CMDlet,
it will not trigger the Trap.
you can use parameters to fill the errorvariable and erroraction to supress
message.

PoSH> gwmi -class win32_networkadapter -computer foo -ev fooerror -ea
SilentlyContinue

PoSH> $fooerror
Get-WmiObject : The RPC server is unavailable. (Exception from HRESULT:
0x800706BA)
At line:1 char:5
+ gwmi <<<< -class win32_networkadapter -computer foo -ev fooerror -ea
SilentlyContinue

Greetings /\/\o\/\/

"HungYuWu" <HungYuWu@discussions.microsoft.com> wrote in message
news:241808BB-FD1E-4B24-812B-9A789FC364A5@microsoft.com...
>I use the following statement and the computer is off,but it can't trap the
> error that the gwmi generats(the error is "the RPC server is unavailable).
>
> trap{"ERROR"} $a = gwmi -class win32_networkadapter -computer
> "My_Dead_Computer_Name"
>
> Is this the problem of error scope ?
>
> Thanks a lot!
>
>

So when you are writing a cmdlet, what is the best practice? Swallow all
the exceptions the way Get-WmiObject does?

//Andrew

/\/\o\/\/ [MVP] wrote:
> As this does not generate an exception, the error is catched by the
> CMDlet, it will not trigger the Trap.
> you can use parameters to fill the errorvariable and erroraction to
> supress message.
>
> PoSH> gwmi -class win32_networkadapter -computer foo -ev fooerror -ea
> SilentlyContinue
>
> PoSH> $fooerror
> Get-WmiObject : The RPC server is unavailable. (Exception from HRESULT:
> 0x800706BA)
> At line:1 char:5
> + gwmi <<<< -class win32_networkadapter -computer foo -ev fooerror -ea
> SilentlyContinue
>
> Greetings /\/\o\/\/
>
> "HungYuWu" <HungYuWu@discussions.microsoft.com> wrote in message
> news:241808BB-FD1E-4B24-812B-9A789FC364A5@microsoft.com...
>> I use the following statement and the computer is off,but it can't
>> trap the
>> error that the gwmi generats(the error is "the RPC server is
>> unavailable).
>>
>> trap{"ERROR"} $a = gwmi -class win32_networkadapter -computer
>> "My_Dead_Computer_Name"
>>
>> Is this the problem of error scope ?
>>
>> Thanks a lot!
>>
>>
>