Inheritance diagram for IITObject:
An IITObject uniquely identifies a source, playlist, or track in iTunes using four separate IDs. These are runtime IDs, they are only valid while the current instance of iTunes is running.
As of iTunes 7.7, you can also identify an IITObject using a 64-bit persistent ID, which is valid across multiple invocations of iTunes.
The main use of the IITObject interface is to allow clients to track iTunes database changes using _IiTunesEvents::OnDatabaseChangedEvent().
You can retrieve an IITObject with a specified runtime ID using IiTunes::GetITObjectByID().
An IITObject will always have a valid, non-zero source ID.
An IITObject corresponding to a playlist or track will always have a valid playlist ID. The playlist ID will be zero for a source.
An IITObject corresponding to a track will always have a valid track and track database ID. These IDs will be zero for a source or playlist.
A track ID is unique within the track's playlist. A track database ID is unique across all playlists. For example, if the same music file is in two different playlists, each of the tracks could have different track IDs, but they will have the same track database ID.
An IITObject also has a 64-bit persistent ID which can be used to identify the IITObject across multiple invocations of iTunes. Note that persistent IDs are only really persistent for objects that iTunes stores in its database. For example, the persistent IDs for transient objects like radio streams and objects from audio CDs will differ across multiple invocations of iTunes.
The persistent ID was exposed in the COM interface starting with iTunes 7.7, so methods and properties to retrieve the persistent ID could not be added to the IITObject interface without breaking existing COM clients. You can find these routines in IiTunes instead:
You can retrieve a source, playlist, or track with a specified persistent ID using the ItemByPersistentID property of the appropriate collection interface:
Public Member Functions | |
Methods | |
| HRESULT | GetITObjectIDs ([out] long *sourceID,[out] long *playlistID,[out] long *trackID,[out] long *databaseID) |
| Returns the four IDs that uniquely identify this object. | |
Properties | |
| HRESULT | Name ([out, retval] BSTR *name) |
| Returns the name of the object. | |
| HRESULT | Name ([in] BSTR name) |
| Set the name of the object. | |
| HRESULT | Index ([out, retval] long *index) |
| Returns the index of the object in internal application order. | |
| HRESULT | SourceID ([out, retval] long *sourceID) |
| Returns the ID that identifies the source. | |
| HRESULT | PlaylistID ([out, retval] long *playlistID) |
| Returns the ID that identifies the playlist. | |
| HRESULT | TrackID ([out, retval] long *trackID) |
| Returns the ID that identifies the track within the playlist. | |
| HRESULT | TrackDatabaseID ([out, retval] long *databaseID) |
| Returns the ID that identifies the track, independent of its playlist. | |
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Returns the four IDs that uniquely identify this object. This method is not usable from scripting clients, since it returns multiple output parameters. Scripting clients must use the IITObject::SourceID(), IITObject::PlaylistID(), IITObject::TrackID(), and IITObject::TrackDatabaseID() properties instead. These are runtime IDs, they are only valid while the current instance of iTunes is running.
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Returns the index of the object in internal application order. You can pass this index to IITSourceCollection::Item(), IITPlaylistCollection::Item(), or IITTrackCollection::Item() to retrieve this object. For tracks, this index is independent of play order. The play order index of a track can be retrieved using IITTrack::PlayOrderIndex().
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Set the name of the object. You can only change the name of a track or playlist. You cannot change the name of a source. Object names are not unique in iTunes, e.g. multiple playlists may share the same name.
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Returns the name of the object. For a source, this is the name of the source (as displayed in the Source list). For a playlist, this is the name of the playlist. For a track, this is the name of the track. Object names are not unique in iTunes, e.g. multiple playlists may share the same name.
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Returns the ID that identifies the playlist. Valid for a playlist or track. Will be zero for a source. This is a runtime ID, it is only valid while the current instance of iTunes is running.
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Returns the ID that identifies the source. Valid for a source, playlist, or track. This is a runtime ID, it is only valid while the current instance of iTunes is running.
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Returns the ID that identifies the track, independent of its playlist. Valid for a track. Will be zero for a source or playlist. If the same music file is in two different playlists, each of the tracks will have the same track database ID. This is a runtime ID, it is only valid while the current instance of iTunes is running.
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Returns the ID that identifies the track within the playlist. Valid for a track. Will be zero for a source or playlist. This is a runtime ID, it is only valid while the current instance of iTunes is running.
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