Download channel9 video/audio feeds (proxy supported)

Channel9Downloader

Function Get-ProxyWebClient {
    $webclient = New-Object System.Net.WebClient
    $proxy = New-Object System.Net.WebProxy($global:ProxyUrl, $global:ProxyPort)
    $proxy.Credentials = (Get-Credential).GetNetworkCredential()
    $webclient.Proxy = $proxy
    return $webclient
}

Function Channel9Downloader( [string]$feed, [string]$destination ) {
    # $feed = "http://channel9.msdn.com/Shows/Azure-Friday/feed/mp4high"
    # $destination = "AzureFriday"

    mkdir "~\Desktop\${destination}"
    cd "~\Desktop\${destination}"

    $w = Get-ProxyWebClient
    $a = ([xml]($w).downloadstring($feed))

    $a.rss.channel.item | foreach{  
        $url = New-Object System.Uri($_.enclosure.url)
            $file = $url.Segments[-1]
            if (!(test-path $file))
            {
                Start-BitsTransfer -Source $url -Destination $file -Asynchronous
            }
    }

    Start-Job { 
        While ((Get-BitsTransfer).JobState -contains 'Transferring') {
            Get-BitsTransfer | Where-Object { $_.JobState -eq 'Transferred' } | Foreach { Complete-BitsTransfer -BitsJob $_ }
            Start-Sleep 5        
        }
    }
}