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NS_E_USER_STOP
Practical scope of NS_E_USER_STOP
This HRESULT is produced at terminating the current Player operation in response to explicit user cancellation. NS_E_USER_STOP belongs to user cancellation and operation ownership, not to an undifferentiated “Windows Media problem.”
Pipeline position
At the NS_E_USER_STOP checkpoint, long-running ripping, burning, synchronization and transfer operations expose cancellation through the Player UI and event model; A cancellation result records control flow, not media corruption. The page-specific boundary is terminating the current Player operation in response to explicit user cancellation.
For NS_E_USER_STOP, a canceled operation can leave a valid source, device and configuration; it only proves that the current generation was deliberately stopped. In a typical failing run, the user presses Stop during ripping or synchronization.
Reproduction record
| Evidence | Why it matters for user stop |
|---|---|
| Producing object and operation | operation type and generation, initiating command, cancel source, state before cancellation, active item, progress value, callback order and cleanup result |
| Decisive observation | operation generation, user command, active item, progress and cleanup callbacks |
| Generation identity | Record the same disc, device, job or Player operation generation that returned NS_E_USER_STOP; a reconnect or media change creates a different test. |
| Underlying result | Keep the first device, filesystem, COM, codec, DirectShow, IMAPI or BITS result seen before the Player mapped it to NS_E_USER_STOP. |
| Controlled comparison | Repeat the producing call after changing only this condition: treat the generation as canceled, complete cleanup and wait for a new start request. |
Reading the evidence
| Observation | Interpretation |
|---|---|
| The recorded values match the boundary | The result is consistent with terminating the current Player operation in response to explicit user cancellation; correct that state before changing unrelated codecs, drivers or playlists. |
A lower layer failed before NS_E_USER_STOP | Preserve that earlier HRESULT or device result because NS_E_USER_STOP may be only the Player-level mapping. |
| The same call passes after one isolated change | The comparison supports the user stop diagnosis rather than a broad installation failure. |
The code changes after retesting NS_E_USER_STOP | The NS_E_USER_STOP boundary was passed; diagnose the new HRESULT as the next independent stage. |
NS_E_USER_STOP scopes the failure to terminating the current Player operation in response to explicit user cancellation. The presence of NS_E_USER_STOP does not establish a system-wide media failure; verify its owning operation before changing unrelated Player components.
Verification procedure
- Capture
0xC00D0FA9,NS_E_USER_STOP, the exact Player/API operation and the first timestamp at which it appears. - Save operation generation, user command, active item, progress and cleanup callbacks; do this before ejecting media, reconnecting a device, canceling a job or rebuilding the Player object.
- For
NS_E_USER_STOP, correlate the result with operation type and generation, initiating command, cancel source, state before cancellation, active item, progress value, callback order and cleanup result. - Reproduce once with the original source and destination, then apply only this change: treat the generation as canceled, complete cleanup and wait for a new start request.
- Create a fresh operation generation and verify that the original call advances beyond the user stop boundary.
Results that may look similar
| Related result | Different diagnostic boundary |
|---|
Change the smallest responsible condition
The targeted action is to treat the generation as canceled, complete cleanup and wait for a new start request. While retesting NS_E_USER_STOP, keep unrelated media, device, playlist and network values unchanged.
When verifying NS_E_USER_STOP, do not convert an expected user cancellation into an automatic repair workflow; Finish cleanup and let a new user action create a new operation generation.
References for the NS_E_USER_STOP boundary
- About CD Ripping.
- About CD Burning.
- About Device Synchronization.
- Completing and canceling a BITS job.
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