EINSATZ FREMDER SKRIPTE UND MODULE

Listing 1: Code mit AST prüfen

$file = "<Pfad zu .ps1 oder .psm1>"
$AST = [System.Management.Automation.
Language.Parser]::ParseFile(
$File, [ref]$null, [ref]$null
)
$commandsFound = @()
$AST.FindAll({$args[0].GetType().Name -like
'CommandAst'}, $true) |
ForEach-Object {
$commandsFound += [pscustomobject]@{
Cmdlet = $_.CommandElements[0].Value
Parameters = $_.CommandElements.
ParameterName
}
}
$commandsFound | Sort-Object Cmdlet,
Parameters -Unique


PERFORMANTE UND BENUTZERFREUNDLICHE CMDLETS

Listing 1: Get-WeatherReport-Cmdlet

function Get-WeatherReport {
[CmdletBinding()]
param (
[string] $Apikey = <Ihr API-Key>
[Parameter(Mandatory,ValueFromPipeline)]
[string[]] $City,
[string] $Units = 'metric'
)
## Main
process {
foreach ($item in $City) {
$Uri =
"http://api.openweathermap.org/data/2.5/weather?units=$Units&q=$Item&appid=$Apikey"
Invoke-RestMethod -Uri $Uri | Select-Object -ExpandProperty Main
}
}
}
Get-WeatherReport -City 'Munic','Berlin','Hamburg' | Format-Table
'Köln','Frankfurt','Stuttgart' | Get-WeatherReport | Format-Table


Listing 2: Verbesserte Version des Get-WeatherReport-Cmdlet

function Get-WeatherReport {
[CmdletBinding()]
[Alias('gwr')]
param (
[string] $Apikey = <Ihr API-Key>,
[Parameter(Mandatory, ValueFromPipeline)]
[string[]] $City,
[string] $Units = 'metric'
)
begin {
switch ($Units) {
'metric' { $unit = 'Celsius' }
'imperial' { $unit = 'Fahrenheit' }
'standard' { $unit = 'Kelvin' }
}
$stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
}
process {
foreach ($item in $City) {
$uri =
"http://api.openweathermap.org/data/2.5/weather?units=$Units&q=$item&appid=$Apikey"
try {
$request = Invoke-RestMethod -UseBasicParsing -Uri $uri -Verbose:$false
-ErrorAction Stop
[pscustomobject] @{
'City' = $request.name
'Description' = $request.weather.DESCRIPTION
'AirPressure' = $request.main.pressure
'AirHumidity' = $request.main.humidity
'Temperature' = $request.main.temp
'Unit' = $unit
}
}
catch {
Write-Warning -Message "Webrequest failed! City: $City, API-Key: $Apikey,
Units: $Units"
}
}
}
end {
'Runtime(ms): ' + $stopwatch.Elapsed.TotalMilliseconds | Write-Verbose
}
}
Get-WeatherReport -City 'Munic', 'Berlin', 'Hamburg' -Units imperial -Verbose | Format-Table
'Cologne', 'Frankfurt', 'Stuttgart' | Get-WeatherReport -Verbose | Format-Table


Listing 3: Invoke-Command geschickt einsetzen

function Get-HardwareInformation {
[CmdletBinding()]
[Alias('ghwi')]
Param (
[Parameter(Mandatory,ValueFromPipeline)]
[string[]] $Computername
)
Begin {
$stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
$code = { } ## Ihr Code zur Hardwareinventarisierung
}
Process {
## Wir sammeln die übergebenen Computernamen in einem neuen Array
[string[]] $Computernames += $Computername
}
End {
## MAIN-Code
$psSessions = New-PSSession -ComputerName $Computernames -ErrorAction SilentlyContinue
Invoke-Command -Session $psSessions -ScriptBlock $code
$psSessions | Remove-PSSession
## Laufzeit ermitteln
Write-Verbose -message "Runtime(ms): $($stopwatch.ElapsedMilliseconds)"
}
}


NATIVEN CODE NUTZEN

Listing 1: C#-Code in einer Variablen speichern

$dotnetclass = @"
public class Dog
{
public Dog()
{
Name = "Snoopy";
}
public Dog (string name)
{
Name = name;
}
public string Name { get; set; }
public override string ToString()
{
return "Woof! I am " + Name;
}
public static string Bark ()
{
return "Woof! Woof!";
}
}
"@
Add-Type -TypeDefinition $dotnetclass


Listing 2: P/Invoke für CopyFile aus der Kernel32.dll

[DllImport("kernel32.dll", SetLastError=true,
CharSet=CharSet.Auto)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool CopyFileEx(string
lpExistingFileName,
string lpNewFileName, CopyProgressRoutine
lpProgressRoutine,
IntPtr lpData, ref Int32 pbCancel,
CopyFileFlags dwCopyFlags);