Een introductie tot Windows PowerShell

#

# Dit script haalt de laatste acht headlines van Tweakers.net op

# en geeft ze met een samenvatting weer in de browser

#

function Show-HTML ($html) {

    $ie=New-Object -ComObject InternetExplorer.Application

    $ie.menubar=0

    $ie.toolbar=0

    $ie.statusbar=0

    $ie.navigate("about:blank")



    $ie.document.body.innerHtml = $html



    $ie.visible="true"

}



$rssUrl = "http://tweakers.net/feeds/nieuws.xml/direct"

$feed= [xml](new-object System.Net.WebClient).DownloadString($rssUrl)



$resultaat = $feed.rss.channel.item | select title,description -first 8 | ConvertTo-Html -title "Laatste headlines van Tweakers.net" 



Show-HTML($resultaat)

# Author: Marcel Ortiz

# Modified by: Sung Kim

# Deze functie berekent de MD5-hash van een opgegeven bestand

#



function Get-MD5 {

	param([System.IO.FileInfo] $file)



	begin {

		function DisplayUsage {

			$private:UsageString =  'USAGE: Get-MD5 [System.IO.FileInfo]`n'

			$private:UsageString += 'Examples:`n'

			$private:UsageString += '1) Get the MD5 bytes for the specified argument`n'

			$private:UsageString += '`tGet-MD5 (Get-Item file_name)`n'

			$private:UsageString += '2) Get MD5 bytes for pipeline input`n'

			$private:UsageString += '`tls | Get-MD5`n'

			$private:UsageString += '3) How to check(a quick way) if two files have same MD5 hash values`n'

			$private:UsageString += '`tif (Compare-Object (get-md5 (gi fileName1)) (get-md5 (gi fileName2))) `n'

			$private:UsageString += '`t{ "different" } else { "same" }'

			Write-Host -ForegroundColor "White"  $private:UsageString

		}



		function ComputeHash([System.IO.FileInfo]$fileInfo) {

			$PRIVATE:stream = $null;

			# A type Shortcut for MD5CryptoServiceProvider type

			# Reference: http://blogs.msdn.com/powershell/archive/2006/07/12/663540.aspx

			$PRIVATE:cryptoServiceProvider = [System.Security.Cryptography.MD5CryptoServiceProvider];

			$PRIVATE:hashAlgorithm = new-object $PRIVATE:cryptoServiceProvider

			$PRIVATE:stream = $fileInfo.OpenRead();

			$PRIVATE:hashByteArray = $PRIVATE:hashAlgorithm.ComputeHash($PRIVATE:stream);

			$PRIVATE:stream.Close();



			# We have to be sure that we close the file stream

			# if any exceptions are thrown.

			trap {

				if ($PRIVATE:stream -ne $null) {

					$PRIVATE:stream.Close();

				}

				break;

			}



			return $PRIVATE:hashByteArray;

		}



	}



	process {

		if ($_ -is [IO.FileInfo]) {

			ComputeHash($_)

		}

	}



	end {

		# Check if "-?", "-h" or "-help" argument has been passed

		if ($args[0] -match '-(\?|(h|(help)))') {

			DisplayUsage

			return;

		}



		if ($file) {

			ComputeHash($file)

		}



		trap {

			DisplayUsage;

			break;

		}

	}

}