Powershell script logging

Hello,

I'd like to log what my scripts *actually* do as opposed to echoing message strings....I came across a piece of code that seems promising (http://jdhitsolutions.com/blog/2011/03/powershell-automatic-logging/). In this code, the author only displays message strings as opposed to success vs failure command completion....I'm assuming that I need to use some type of error handling and based on that display the output...but I'm not sure how to modify this code to accomplish what I want.

here's what happens:

if I run: TryMe -computername localhost -log c:\utils\sample.txt -verbose
output:

10/27/2011 14:15:15 Starting Command
10/27/2011 14:15:15 Connecting to SERVER2
10/27/2011 14:15:16 INTEL  - 6040000
10/27/2011 14:15:16 finished

This output is nice, but not the output of the actual commands...I'd want to check success/failure on the command (gwmi win32_bios -ComputerName $computername) and write to the log based on that...

if I run: TryMe -computername 'SERVER10' -log c:\utils\sample.txt -verbose
output:

10/27/2011 14:04:01 Starting Command
10/27/2011 14:04:01 Connecting to SERVER10
10/27/2011 14:04:09 finished

 
so...question is...how do I log this error to the log file??  Do I need to use the Try/Catch/Finally construct??

# dot source Write-Log function

Function TryMe {
    [cmdletbinding()]
    Param([string]$computername=$env:computername,
    [string]$Log
    )
    if ($log)
    {
     $loggingPreference="Continue"
     $loggingFilePreference=$log
    }
    Write-log "Starting Command"
    Write-log "Connecting to $computername"
    $b=gwmi win32_bios -ComputerName $computername
    $b
    Write-log $b.version
    Write-Log "finished" $log
}

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Function Write-Log {
    [cmdletbinding()]

    Param(
    [Parameter(Position=0)]
    [ValidateNotNullOrEmpty()]
    [string]$Message,
    [Parameter(Position=1)]
    [string]$Path="$env:temp\PowerShellLog.txt"
    )
   
    #Pass on the message to Write-Verbose if -Verbose was detected
    Write-Verbose $Message
   
    #only write to the log file if the $LoggingPreference variable is set to Continue
    if ($LoggingPreference -eq "Continue")
    {
   
        #if a $loggingFilePreference variable is found in the scope
        #hierarchy then use that value for the file, otherwise use the default
        #$path
        if ($loggingFilePreference)
        {
            $LogFile=$loggingFilePreference
        }
        else
        {
            $LogFile=$Path
        }
       
        Write-Output "$(Get-Date) $Message" | Out-File -FilePath $LogFile -Append
    }

} #end function

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