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NS_E_WMX_PLAYLIST_EMPTY
Understanding NS_E_WMX_PLAYLIST_EMPTY in a Windows Media playlist
NS_E_WMX_PLAYLIST_EMPTY (0xC00D1074) is returned when the requested playlist operation requires at least one current item but the WMX playlist contains none.
Distinguish in-memory Playlist state, WPL or ASX parsing, nested-list expansion, Media-object resolution and execution of referenced items. Here, the decisive boundary is the requested playlist operation requires at least one current item but the WMX playlist contains none. This result is most useful when treated as a Player checkpoint, not as a recommendation to reinstall everything.
Playlist boundary
AllStat already supplies the standard user-facing description for this HRESULT; this custom block instead isolates the additional technical boundary. Earlier success in file lookup, network connection, parser creation or graph construction does not prove that the later the operation is valid.
Case-specific checkpoint: count before the call, filters used to build the list, asynchronous load state and skipped invalid entries. The controlled comparison for this HRESULT is: append one verified local Media object and repeat the exact operation without changing anything else.
Closest distinction: NS_E_ASX_NOTHING_TO_WRITE is specifically a save/serialization boundary.
Evidence from the list model
| Capture | Why it matters for this HRESULT |
|---|---|
| Object or resource | count before the call, filters used to build the list, asynchronous load state and skipped invalid entries |
| State snapshot | Record the Player openState/playState or operation phase, object identity and exact timestamp when this result was returned. |
| First lower result | Keep the earliest Win32, Winsock, COM, parser, codec, DRM or device result that appears before this result. |
| Comparison record | Use one known-good case that follows the same API, protocol and component path while changing only the rejected precondition. |
Minimal playlist experiment
- Record
0xC00D1074, this result, the exact method or command and the first failure time. - Preserve count before the call, filters used to build the list, asynchronous load state and skipped invalid entries.
- Perform one isolated comparison: append one verified local Media object and repeat the exact operation without changing anything else.
- Repeat the original Player path after it and keep any new HRESULT as a downstream result.
- confirm the expected state transition rather than only disappearance of the dialog.
What the result means
| Retest outcome | Interpretation |
|---|---|
| Same it on the same object | The governing state or value is unchanged, or the caller is reusing an object created before the relevant change. |
| Fresh object succeeds | Lifetime, cached configuration or stale playlist/graph state contributed to it. |
| A later HRESULT appears | The rejected condition — the requested playlist operation requires at least one current item but the WMX playlist contains none — was cleared for this HRESULT; diagnose the new code at its own layer. |
| Only one item or endpoint fails for this HRESULT | The evidence favors resource-specific data, rights, routing or device state rather than a global Player failure. |
Actions that obscure the cause
- adding a blank URL as a placeholder.
- Do not discard the first occurrence by repeatedly invoking Play, open, save or retry; later events can replace its original state.
- do not publish credentials, private URLs, license material or complete protected-content headers; retain only redacted identifiers, lengths, hashes and protocol fields.
Technical references
- Windows Media Player SDK
- Windows Media Playlists
- Windows Media Playlist elements
- Managing playlists
- Microsoft HRESULT registry
Close it only when the original operation crosses this boundary and reaches the expected next Player state.
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