Click here to Skip to main content
15,940,430 members
Please Sign up or sign in to vote.
0.00/5 (No votes)
See more:
I created a PowerShell script that accesses iTunes on my PC, but I failed at receiving events from the iTunes object. The code which I found on the internet (in fact, Chat GPT recommended this code) is:
PowerShell
$eventHandler = {Write-Host "OnPlayerPlayEvent"}
$iTunes = New-Object -ComObject iTunes.Application
Register-ObjectEvent -InputObject $global:iTunes `
    -EventName "OnPlayerPlayEvent" -Action $eventHandler `
    -SourceIdentifier "iTunesPlayerPlay"

The 'Register-ObjectEvent' line returns this error message: "Cannot register for the specified event. An event with the name 'OnPlayerPlayEvent' does not exist."

Note: The Documentation of OnPlayerPlayEvent can be found at http://www.joshkunz.com/iTunesControl/interface__IiTunesEvents.html#a1

What I have tried:

Chat GPT suggested variants of the above code, Replacing 'Register-Object' by this:
PowerShell
$iTunes.add_OnPlayerPlay($eventHandler)

or this:
PowerShell
$comObject = [System.Runtime.InteropServices.Marshal]::GetIUnknownForObject($iTunes)
$iTunesEventSource = [System.Runtime.InteropServices.Marshal]::GetObjectForIUnknown($comObject)
$event = Register-ObjectEvent -InputObject $iTunesEventSource `
    -EventName "OnPlayerPlayEvent" -Action $eventHandler `
    -SourceIdentifier "iTunesPlayerPlay"

The former failed with "Method invocation failed because [System.__ComObject] does not contain a method named 'add_OnPlayerPlay'" and the latter with "An event with the name 'OnPlayerPlayEvent' does not exist".
I varied the event name, adding or removing the "On" prefix and/or "Event" postfix, with no effect.

I tried
PowerShell
$iTunes | Get-Member -MemberType Event

but that returned nothing (i.e. $null).

I am wondering whether events must be enabled in iTunes (didn't find an option), or maybe I must retrieve a different interface before I can subscribe to events? Or have I run into a limitation of PowerShell? Or have I misunderstood the concept of subscribing to COM events in PowerShell?

Thanks for your help
Hans
Posted
Updated 12-Mar-23 6:08am
v2

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)



CodeProject, 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 +1 (416) 849-8900