How can i change an Object type ?

[KuhlmannSascha]

Hi,

i tried now for several hours to read through a win32com API to access
Itunes and read out myplaylists.

First of all the Code:

import os, sys, pythoncom, win32com.client, pywintypes, sets

def showplaylists():
iTunes = win32com.client.Dispatch("iTunes.Application")
playlists = iTunes.LibrarySource.Playlists
numPlaylists = playlists.Count
while (numPlaylists != 0):
curPlaylist = playlists.Item(numPlaylists)
if curPlaylist.Kind == 2:
if curPlaylist.Smart():
numPlaylists -= 1
else:
print curPlaylist.Name
numtrack = curPlaylist.Tracks.Count
while (numtrack !=0):
curPlaylist.Tracks(numtrack).Name
numtrack -= 1
numPlaylists -= 1
showplaylists()

The current Logic is to access first Itunes and then a Playlist
Collection.
This Playlist collection returns different kind of objects for
Playlists.
I am focussing on the Playlists of the object UserPlaylist.
(CodeLine: if curPlaylist.Kind == 2
After that i should be sure to have a UserPlaylist, but Python stops
with an exception that the requested Attribute "Smart" is not
available
Error MEssage:
AttributeError: '<win32com.gen_py.iTunes 1.9 Type Library.IITPlaylist
instance at 0x30216960>' object has no attribute 'Smart'


Any help is appreciated......

Regards
Sascha

 

[Jerry Hill]

I am focussing on the Playlists of the object UserPlaylist.
(CodeLine: if curPlaylist.Kind == 2
After that i should be sure to have a UserPlaylist, but Python stops
with an exception that the requested Attribute "Smart" is not
available

It looks like win32com thinks you have a IITPlaylist, and you really
have a subclass of that, a IITUserPlaylist. You need to cast it like
this:

import win32com.client
iTunes = win32com.client.gencache.EnsureDispatch('iTunes.Application')
playlists = iTunes.LibrarySource.Playlists
for playlist in playlists:
if playlist.Kind == 2:
playlist = win32com.client.CastTo(playlist, 'IITUserPlaylist')
print "Name: ", playlist.Name
print "Kind: ", playlist.Kind
print "Smart: ", playlist.Smart
print

 

[Tim Roberts]

i tried now for several hours to read through a win32com API to access
Itunes and read out myplaylists.

First of all the Code:
...
The current Logic is to access first Itunes and then a Playlist
Collection.
This Playlist collection returns different kind of objects for
Playlists.
I am focussing on the Playlists of the object UserPlaylist.
(CodeLine: if curPlaylist.Kind == 2
After that i should be sure to have a UserPlaylist, but Python stops
with an exception that the requested Attribute "Smart" is not
available
Error MEssage:
AttributeError: '<win32com.gen_py.iTunes 1.9 Type Library.IITPlaylist
instance at 0x30216960>' object has no attribute 'Smart'

Smart is part of IITUserPlaylist, not IITPlaylist. You need to call
curPlaylist.QueryInterface to get the IITUserPlaylist, but that means
you'll need to know the GUID for IITUserPlaylist. Perhaps Google will
help.

 

[kyosohma]

Smart is part of IITUserPlaylist, not IITPlaylist. You need to call
curPlaylist.QueryInterface to get the IITUserPlaylist, but that means
you'll need to know the GUID for IITUserPlaylist. Perhaps Google will
help.

These look like they could give you some pointers too:

http://www.brunningonline.net/simon/blog/archives/001627.html
http://lazycat.org/backburner.html
http://mail.python.org/pipermail/python-win32/2007-February/005506.html

Mike

 

[KuhlmannSascha]

These look like they could give you some pointers too:

http://www.brunningonline.net/simon...ermail/python-win32/2007-February/005506.html

Mike

Thanks all of you !
The Casting was the issue !!!
Regards
Sascha