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iTunes 7.7 COM bug

I’ve had a little utility for quite some time now that I use mainly to let the iTunes’ current song play through its end, then stop. It’s one feature from Winamp that I couldn’t deal without.

Quite recently, I upgraded to iTunes 7.7. My little utility stopped working. When I finally got around to looking into the error, I found this:

Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import win32com.client
>>> itunes = win32com.client.Dispatch("iTunes.Application")
>>> help(itunes._print_details_)
Help on method _print_details_ in module win32com.client.dynamic:

_print_details_(self) method of win32com.client.CDispatch instance
Debug routine - dumps what it knows about an object.

>>> itunes._print_details_()
AxDispatch container iTunes.Application
Get Props:
Put Props:

You’ll note that as far as COM is concerned, iTunes no longer publishes any methods or properties in its only externally instantiable interface. In other words, it’s become a black box with no inputs or outputs. You can tell that it’s there, but you can’t interact with it in any way.

I may try again in some other language; it’s possible that iTunes is somehow no longer compatible with the python win32com implementation, but still works with others. Still, it’s annoying.

[edit 20080914]

Things work nicely again in iTunes; hopefully they stay working this time.

Also, I discovered that my code example above is not very helpful. It seems that the methods in the win32com client object are lazily added the first time they are called, so _print_details_() will only ever show methods that have already been called successfully. I suppose I should be happy that they implemented COM support at all, instead of being annoyed that introspection doesn’t work as well as python has accustomed me to.

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