http://pseventing.codeplex.com/ http://pseventing.codeplex.com/downloads/get/36159 some issue i fixed Event Listening

eventhander.ps1

# updated for pseventing 1.1

if ((get-pssnapin pseventing -ea silentlycontinue) -eq $null) {
    add-pssnapin pseventing
}

function add-eventhandler ($variable,
        $eventName ,
        [scriptblock]$script = $(throw "script cannot be null")) {

    if ((get-pssnapin pseventing -ea silentlycontinue) -eq $null) {
        add-pssnapin pseventing
    }


    if ($__handlers -eq $null) {
        $global:__handlers = @{}
    }

    if ($__handlers.ContainsKey($variable)) {
# already contains the var
        $__handlers[$variable].Add($eventName, $script)
    }
    else {
# new var entryw
        $__handlers.Add($variable, @{$eventName=$script})
    }

    connect-event  -VariableName $variable -EventName $eventname
}

function remove-eventhandler($variable ,
        $eventName ) {

    if ((get-pssnapin pseventing -ea silentlycontinue) -eq $null) {
        add-pssnapin pseventing
    }

    if ($__handlers) {
        disconnect-event -VariableName $variable -EventName $eventname

    }
}



function show-eventhandler {
    if ((get-pssnapin pseventing -ea silentlycontinue) -eq $null) {
        add-pssnapin pseventing
    }

    if ($__handlers) {
        foreach ($variable in $__handlers.Keys) {
            $mapping = $__handlers.Item($variable)
            $name = $variable.name
            foreach ($eventName in $mapping.Keys) {
                "`$$name.$eventName => $($mapping.item($eventName))"
            }
        }
    }
}

function do-events($exitImmediately = $false) {
    if ((get-pssnapin pseventing -ea silentlycontinue) -eq $null) {
        add-pssnapin pseventing
    }

    $exit = $exitImmediately

    start-keyhandler -capturectrlc
    trap { stop-keyhandler }

    do {
        $events = @(read-event -wait)
        foreach ($event in $events) {
            if ($event.Name -eq "CtrlC") {
                "ctrl+c hit, exiting."
                $exit = $true
                break
            }

            $var = $event.source
            if ($var) {
                if ($__handlers.ContainsKey($var.Name)) {
# call scriptblock with familiar (sender, eventargs) signature
                    $__handlers.Item($var.Name).Item($event.name).Invoke($var, $event.args)
                }
            }

        }
    } while ($exit -eq $false)

    stop-keyhandler
}

test.ps1

$Clock =New-Object System.Timers.Timer -Property @{Interval=3000;AutoReset=$true;Enabled=$true}
$Clock.Start()
. C:\eh.ps1
Add-EventHandler Clock Elapsed {"Hello World" |Out-Host}


$sb={
$event=read-event
$var = $event.source
  		if ($var) {
				if ($__handlers.ContainsKey($var.Name)) {
					# call scriptblock with familiar (sender, eventargs) signature
					$__handlers.Item($var.Name).Item($event.name).Invoke($var, $event.args)
				}
			}
}
do-events