Attributes with Multiple Values (Windows Media Format 11 SDK)
[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
Some of the predefined attributes can have multiple values assigned to them. For example, Artist is an attribute that can have multiple values. You can call IWMHeaderInfo3::AddAttribute multiple times to add as many Artist values as you require. If you make multiple calls to AddAttribute for attributes that do not support multiple values, the method may return an error code, or simply ignore your request.
The following table lists the attributes that support multiple values. Some attributes can have multiple values only in ASF files, while others can have multiple values in both ASF and MP3 files.
| Attribute | Support for multiple values |
|---|---|
| Author | ASF, MP3 |
| WM/AlbumArtist | ASF |
| WM/AlbumCoverURL | ASF |
| WM/Category | ASF |
| WM/Composer | ASF, MP3 |
| WM/Conductor | ASF |
| WM/Director | ASF |
| WM/Genre | ASF |
| WM/GenreID | ASF |
| WM/Language | ASF, MP3 |
| WM/Lyrics_Synchronised | ASF, MP3 |
| WM/Mood | ASF, MP3 |
| WM/Picture | ASF, MP3 |
| WM/Producer | ASF |
| WM/PromotionURL | ASF |
| WM/UserWebURL | ASF, MP3 |
| WM/Writer | ASF, MP3 |
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