What does HRESULT 0x800416A1 (SEARCH_E_NOMONIKER) mean?

 
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FDAEMON_E_TOOMANYFILTEREDBLOCKS SEARCH_E_NOREGION

SEARCH_E_NOMONIKER

The initialized filter does not support retrieving hits as monikers

SEARCH_E_NOMONIKER is the failure HRESULT 0x800416A1 (-2147215711 signed; 2147751585 unsigned). Its severity bit is 1, facility is 4 (FACILITY_ITF), and code is 0x16A1. AllStat describes it as “Retrival of hits as monikers is not supported (by filter passed into Init).”

Contract and failing stage

This result belongs to legacy Windows hit retrieval and is returned while requesting a moniker representation for a hit after the caller configured the filter through IFilter::Init. The exact condition is: the initialization capability flags or filter implementation do not provide moniker-based hit retrieval. This stage matters because converting the result to a generic COM failure removes the information needed to choose the owner and retry policy.

This value belongs to hit-retrieval capability negotiation around legacy filtering interfaces. It does not mean that matching failed; it says the requested representation of an already identified hit is unavailable under the filter capabilities established at initialization. IFilter initialization documentation clarifies capability negotiation, but callers must use the flags returned by the actual filter instance rather than assuming support.

Conditions that produce it

  • This result can appear when IFilter::Init input flags disagrees with the state expected while requesting a moniker representation for a hit after the caller configured the filter through IFilter::Init.
  • a stale or transformed returned capability flags can make the component observe that the initialization capability flags or filter implementation do not provide moniker-based hit retrieval.
  • an incomplete filter CLSID/version hides the distinction needed to separate this HRESULT from a later catalog or service failure.
  • changes in requested hit representation between validation and execution can reproduce the result even when the user-visible input looks unchanged.
  • Retrying this result with the same document type leaves the decisive contract violation intact.

The strongest hypothesis for it must account for the operation—requesting a moniker representation for a hit after the caller configured the filter through IFilter::Init—and the documented condition. An unavailable hit representation does not mean matching failed; it identifies a capability mismatch after filter initialization.

Evidence to preserve

  • preserve IFilter::Init input flags before objects or work items are released.
  • associate returned capability flags with the exact UTC timestamp and correlation identifier.
  • compare failing and known-good values for filter CLSID/version under the same provider or handler version.
  • record the source and normalization path of requested hit representation, not only its display form.
  • use document type to test whether the failure belongs to parsing, execution, indexing or capability negotiation.
  • preserve filter initialization flags before objects or work items are released.

Evidence for it should reflect what the component actually received. Document content is usually unnecessary; preserve initialization flags, returned capabilities, requested hit form and hit coordinates instead.

Diagnostic sequence

  1. Capture IFilter::Init input flags and returned capability flags at the call boundary that returns this result.
  2. confirm the operation reached requesting a moniker representation for a hit after the caller configured the filter through IFilter::Init with the intended filter CLSID/version.
  3. perform the decisive check: record the exact <code>IFilter::Init</code> flags, returned capability flags and filter CLSID before requesting the representation.
  4. reduce the case until changing requested hit representation alone changes the HRESULT or proves it irrelevant.
  5. apply the recovery only after verifying document type; preserve the original result for comparison.

A useful control for it changes one dimension at a time. Initialize the same filter twice with controlled flag sets and request only the advertised hit forms to prove the missing capability.

Recovery and retry

Request a supported hit form or initialize a filter that explicitly provides monikers; retries with identical capabilities cannot succeed. Retry it only after the responsible input or state changes and the previous operation has completed or been cancelled. Retries with the same IFilter capabilities cannot add an unsupported hit representation; negotiate a different output path.

What the code does not prove

It does not prove that the query or hit is invalid; it states that one requested representation is unavailable under the initialized filter capabilities. Without code-specific evidence for it, the value also cannot identify which wrapper, configuration, handler or service transition introduced the condition.

Related HRESULT values

SEARCH_E_NOREGION rejects filter-region retrieval rather than moniker retrieval. Keep the symbolic HRESULT beside the stage name in telemetry because nearby constants may require different owners, user messages and retry rules despite the same visible symptom.

Developer and administrator guidance

Retain IFilter::Init inputs, returned capabilities, requested hit representation, filter implementation and document type. Do not log credentials or unrestricted document content. Before replacing the filter for it, compare its advertised initialization capabilities with the representation the caller requested.

Practical scenario

A hit-highlighting component assumes every filter can return monikers. Capability negotiation disables that path and uses the supported representation. A regression test for it should assert the decisive evidence, change only the responsible condition, and include one neighboring HRESULT so future code cannot collapse distinct failures into a generic message.

Official Microsoft references

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