What does HRESULT 0xC00D0FA9 (NS_E_USER_STOP) mean?

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. This result belongs to user cancellation and operation ownership, not to an undifferentiated “Windows Media problem.”

Pipeline position

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.

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

Verification procedure

1. Capture 0xC00D0FA9, the exact Player/API operation and the first timestamp at which it appears.
2. Save operation instance, user command, active item, progress and cleanup callbacks; do this before ejecting media, reconnecting a device, canceling a job or rebuilding the Player object.
3. 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.
4. Start a fresh operation and verify that the original call advances without returning NS_E_USER_STOP.

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 it, keep unrelated media, device, playlist and network values unchanged.

During verification, do not convert an expected user cancellation into an automatic repair workflow; Finish cleanup and let a new user action create a new operation instance.

References

• About CD Ripping.
• About CD Burning.
• About Device Synchronization.
• Completing and canceling a BITS job.