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NS_E_WMPOCX_NO_ACTIVE_CORE
Diagnosing NS_E_WMPOCX_NO_ACTIVE_CORE
0xC00D0FD2 maps to this result. Its actionable interpretation is the ActiveX method/property was called before a usable Player core was activated within the Windows Media Player ActiveX control and COM object lifetime; the producing mechanism is the embedded-control layer that activates the Player, optionally remotes it to full mode, marshals event interfaces between COM apartments and exposes error state to the host.
Evidence that separates the result
| Field | What to record |
|---|---|
| Decisive check | Record control creation, activation/site attachment and first state-change event |
| Artifact identity | COM apartment type and thread that created the control for the ActiveX control no active core reproduction |
| Runtime state | IWMPRemoteMediaServices result and isRemote/docked state for this reproduction |
| Owning object | GIT cookie or marshaled event-interface generation for this reproduction |
| Lower-level result | Shutdown order for host window, control, playback engine and plug-ins for this reproduction |
| Correlation | Host process and control version, uiMode and remote/local service type for this reproduction |
Representative case: Host code sets playback properties from a constructor before the ActiveX site is active. The example isolates only the producing component.
Focused test and correction
- Confirm the failure directly: record control creation, activation/site attachment and first state-change event.
- After you complete control activation before invoking the requested member, recreate the owning WMP object and verify that the corrected generation completes.
Nearby results with different boundaries
| Result | Different boundary |
|---|---|
NS_E_WMPOCX_NOT_RUNNING_REMOTELY | A remote-only operation was requested while the control is running in local mode |
NS_E_WMPOCX_NO_REMOTE_CORE | The ActiveX control cannot attach to remote Player services and falls back to local services |
NS_E_WMPOCX_ERRORMANAGERNOTAVAILABLE | The embedded ActiveX control cannot expose its automation error manager to the host |
Verification
Repeat the original operation with a fresh owning object after the identified precondition is corrected. Treat this result as resolved only when that same operation passes this stage; preserve any later HRESULT as a separate failure.
Technical references
- Player control guide — API or format context for this HRESULT.
- Remoting the Windows Media Player control — documentation used to identify the producing boundary of this result.
- Using skins with the control — normative or platform material relevant to this result.
- IGlobalInterfaceTable interface
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