What does HRESULT 0x00080012 (CO_S_NOTALLINTERFACES) mean?

CO_S_NOTALLINTERFACES

COM activation returned only some requested interfaces

CO_S_NOTALLINTERFACES is HRESULT 524306 (0x00080012) from winerror.h. AllStat describes it as “Not all the requested interfaces were available.” The severity bit indicates a nonfailure result, but the value carries a specific condition that must not be collapsed into plain S_OK.

In the COM activation or interface negotiation, CO_S_NOTALLINTERFACES means that not all the requested interfaces were available. Handling of CO_S_NOTALLINTERFACES is complete only after the caller verifies what work occurred and what remains outstanding.

Where the status is encountered

• CO_S_NOTALLINTERFACES can be returned during COM activation requesting multiple interfaces; log the exact method and object state instead of interpreting the constant outside that contract.
• CO_S_NOTALLINTERFACES can be returned during remote COM or DCOM activation; log the exact method and object state instead of interpreting the constant outside that contract.
• CO_S_NOTALLINTERFACES can be returned during component wrappers that preserve per-interface outcomes; log the exact method and object state instead of interpreting the constant outside that contract.

Because CO_S_NOTALLINTERFACES is informational, a language binding may expose it as success and hide the symbolic distinction. Keep the original HRESULT available until the code-specific branch has run.

What must be true before accepting it

For CO_S_NOTALLINTERFACES, verify that the caller identifies exactly which interfaces were returned and whether the missing interfaces are optional for the requested feature. Failure to prove the boundary can make CO_S_NOTALLINTERFACES look healthy while the intended operation remains unfinished.

Classify the operation phase reached at CO_S_NOTALLINTERFACES before releasing objects or issuing replacement work.

Evidence and telemetry

• For CO_S_NOTALLINTERFACES, preserve CLSID and activation context.
• For CO_S_NOTALLINTERFACES, preserve requested IIDs.
• For CO_S_NOTALLINTERFACES, preserve per-IID HRESULT values.
• For CO_S_NOTALLINTERFACES, preserve returned interface pointers and identities.
• For CO_S_NOTALLINTERFACES, preserve required versus optional interface policy.

Also record co_s_notallinterfaces_operation, co_s_notallinterfaces_state_before, co_s_notallinterfaces_state_after, UTC time, process and thread identifiers, component version, and a correlation ID. Keep CO_S_NOTALLINTERFACES traces useful by recording object identity and timing while excluding authentication or content secrets.

Diagnostic sequence

• Capture the raw value 0x00080012 before wrappers, signed-decimal formatting, exceptions, or generic success handling replace CO_S_NOTALLINTERFACES.
• Identify the operation that returned CO_S_NOTALLINTERFACES, including interface or callback, component build, thread, process, and the state-machine phase.
• For CO_S_NOTALLINTERFACES, prove the decisive condition: the caller identifies exactly which interfaces were returned and whether the missing interfaces are optional for the requested feature.
• Inspect every output, count, status array, buffer, callback, task state, media timestamp, transaction vote, or security token that remains part of the CO_S_NOTALLINTERFACES contract.
• Compare state immediately before and after CO_S_NOTALLINTERFACES; success severity does not guarantee that optional work or the caller’s intended high-level action completed.
• Reproduce CO_S_NOTALLINTERFACES with the smallest input that retains the same condition, then alter only the recorded cause before repeating the operation.

Correct handling and recovery

Inspect the per-interface results and release every returned pointer correctly. Continue only with a declared reduced feature set; fail the operation if any required interface is missing.

Retry CO_S_NOTALLINTERFACES only when a documented input or state has changed. Only a meaningful state transition should cause a repeated request after CO_S_NOTALLINTERFACES.

Difference from nearby results

S_OK would indicate that all requested interfaces were available; E_NOINTERFACE is a failure for a specific unsupported interface.

The semantic difference represented by CO_S_NOTALLINTERFACES should be visible in both control flow and operational metrics.

Practical scenario

A multi-interface activation asks for control, diagnostics, and optional preview interfaces. Preview is unavailable, so the application disables previews but retains the valid control and diagnostics pointers.

A regression test should reproduce CO_S_NOTALLINTERFACES, assert the relevant outputs and state, then change only the decisive condition and verify the expected neighboring result or ordinary completion.

Developer and administrator guidance

Code should branch on CO_S_NOTALLINTERFACES before a generic SUCCEEDED(hr) path whenever outputs, continuation, cancellation, or recovery differ. Telemetry should retain CO_S_NOTALLINTERFACES, 0x00080012, the producing method, and a correlation ID.

For CO_S_NOTALLINTERFACES, document ownership of retry, cancellation, cleanup, and user messaging. Administrators should validate a targeted state change for CO_S_NOTALLINTERFACES and then repeat the minimal reproduction.

References

• Microsoft: IUnknown::QueryInterface — official Microsoft material used to interpret CO_S_NOTALLINTERFACES.
• Microsoft: COM and DCOM — official Microsoft material used to interpret CO_S_NOTALLINTERFACES.
• Microsoft: HRESULT values — official Microsoft material used to interpret CO_S_NOTALLINTERFACES.

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