Itunes COM SDK: cannot register function with iTunes Outgoing Interface

Question

I am doing benchmarks and I want to time the encoding of a Music CD. In order to stop the "clock" and compute the time I am trying to bind a function with the _IITConvertOperationStatusEvents::OnConvertOperationCompleteEvent()
I am writing a AutoIt script and I can create the iTunes application object but when I use the ObjEvent function to register my function with the event above it causes a COM exception to be raised and the ObjEvent completes with an error. The exception code I get is 80040200 which seems to be a generic error.
$objApp=ObjCreate("iTunes.Application")
$SinkObject=ObjEvent($objApp, "ITEvent", "_IITConvertOperationStatusEvents")
<<exception 80040200>>
Browsing the iTunes COM TypeLib the _IITConvertOperationStatus does not seem to be a child in the iTunes object hierarchy so I think this is way the exception is being raised. I have tried to register another function with another outgoing interface and this works just perfectly: _IiTunesEvents::OnQuitting()
Do I need to create another object which gets passed as the first parameter to the ObjEvent function?
*Here is the entire script:*
$ITSourceKindAudioCD = 3
$begin = 0
Global $trackName, $progressValue, $maxProgressValue, $SinkObject
$oMyError = ObjEvent("AutoIt.Error","MyErrFunc") ; Install a custom error handler
$objApp = ObjCreate("iTunes.Application")
If @error Then
MsgBox(0, "ObjCreate", "Create Object Failed", 3)
Exit
EndIf
$event = ObjEvent($objApp, "ITEvent1_", "_IiTunesEvents")
If @error Then
MsgBox(0, "Failed", "IiTunesEvent binding failed", 5)
Exit
EndIf
$SinkObject = ObjEvent($objApp, "ITEvent_", "_IITConvertOperationStatusEvents") ; Assign events to UDFs starting with IEEvent_
If @error Then
MsgBox(0, "ObjEvent binding", "ObjEvent failed!", 10)
$objApp.Quit()
Exit
EndIf
$colSources = $objApp.Sources
$begin = TimerInit()
For $objSource in $colSources
If $objSource.Kind = $ITSourceKindAudioCD Then
$strName = $objSource.Name
$colPlaylists = $objSource.Playlists
$objPlaylist = $colPlaylists.ItemByName($strName)
$colTracks = $objPlaylist.Tracks
$objApp.ConvertTracks2($colTracks)
EndIf
Next
Do
; Wait around for the ripping to complete
Until False
; This is my custom error handler
Func MyErrFunc()
$HexNumber = hex($oMyError.number,8)
Msgbox(0,"","We intercepted a COM Error !" & @CRLF & _
"Number is: " & $HexNumber & @CRLF & _
"Windescription is: " & $oMyError.windescription )
EndFunc
Func ITEvent1_OnQuittingEvent()
MsgBox(0, "Bye", "Bye-Bye", 10)
EndFunc
func ITEvent_OnConvertOperationCompleteEvent()
$dif = TimerDiff($begin)
MsgBox(0,"Time Difference",$dif)
$objApp.Quit()
EndFunc

Answer 1

much of this is speculation because I can't remember how many previous versions of iTunes were on these machines...but this is what we're seeing:
extra entries in two registry keys... when it didn't work these two registry entries contained "AppID" values:
HKEYCLASSESROOT\CLSID\{B9E1D2CB-CCFF-4AA6-9579-D7A4754030EF}\Implemented
Categories
HKEYLOCALMACHINE\SOFTWARE\Classes\CLSID\{B9E1D2CB-CCFF-4AA6-9579-D7A4754030EF}
with the APpID set to the same iTunes CLSID string:
{B9E1D2CB-CCFF-4AA6-9579-D7A4754030EF}
and when it did work the AppIDs entries were gone. this is only on XP.
on vista there never was any AppID entry.
but, again, i wonder if that was added by previous versions of iTunes which we didn't install on the vista machines...
Also, worthy of noting is this post from Apple:
http://support.apple.com/kb/HT1925
ciao, raza