Search results for 'app:forums' matching tags 'PowerShell v2' and 'error handling'

Re: Trouble with Try/Catch

skatterbrainz — Thu, 07 May 2009 05:00:00 GMT

This is very good info, but I'm lost when it comes to dealing with COM object exceptions inside PowerShell. Some are rather simple, for example, I've registered a DLL (e.g. KiXtart.DLL which comes with KiXtart 4.60). I can invoke the interface as an object in VBScript and JScript fine. It works. But from within PowerShell I get nothing.

Set objKix = CreateObject("KiXtart.Application") ' works fine

$objKix = new-object -com KiXtart.Application # returns nothing

How should I trap the exception in this case? Or (I would rather) use Try/Catch to find out more about the failure? I'm a bit new to PowerShell so please forgive me for asking boneheaded questions?

Re: Trouble with Try/Catch

Shay — Tue, 30 Dec 2008 06:00:00 GMT

See this help file: about_Try_Catch_Finally

$one=1
$zero=0

try{
$one/$zero
}

catch [System.DivideByZeroException]{
#"The first Catch script block handles System.DivideByZeroException exceptions"
"Attempted to divide by zero"
}

catch {
"the second Catch script block handles any non-specific exceptions"
}

finally {
"All done with trying and catching"
}

Trouble with Try/Catch

tfl — Mon, 29 Dec 2008 06:00:00 GMT

I'm trying to work out how to specify the Catch values for PowerShell V2 CTP3's Try/Catch stuff.

Here's a simple divide by zero error that I'm trying to catch:

<#
.SYNOPSIS
    Demonstrates try/catch/finally in V2
.DESCRIPTION
    Shows a simple example of the try/catch/finally syntax
    introduced into PowerShell CTP3.
    The script divies by zero which creates an exception.
    The powershell parser is smart enougy to recognise any
    attempt to divide by "0" and therefore does not generate
    the run time error.
.NOTES
    File Name : Show-TryCatchFinally.ps1
    Author     : Thomas Lee - tfl@psp.co.uk
    Requires   : PowerShell V2 CTP3
.LINK
    http://www.pshscripts.blogspot.com
#>

##
# Start of script
##

# Try something that fails
$one=1
$zero=0
Try {
      $one/$zero
    }
catch ("Attemped to divide by zero") {
"WOW"
}
Catch {
"Caught in a catch"
$err=$Error[0]
$err
$err |Format-List *}
Finally {"All done with trying and catching"
}

The first catch gives an error. But so does pretty much everything I try. How do I catch this error? And more importantly, where are this get documented??