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OLE_E_ENUM_NOMORE
OLE enumerator cannot continue because backing data is missing
OLE_E_ENUM_NOMORE is HRESULT 2147745794 (0x80040002) from winerror.h. AllStat describes it as “Can't enumerate any more, because the associated data is missing” The result belongs to enumeration of OLE verbs, advise connections, or related object data. The symbol this result is useful only when tied to the method and lifecycle phase where the enumerator has no usable associated data from which to produce another element.
The decisive meaning of this result is that the enumerator has no usable associated data from which to produce another element. The severity bit does not decide handling; the controlling fact is that the enumerator has no usable associated data from which to produce another element. A reliable it diagnosis preserves the raw value and reconstructs the state that made this true: the enumerator has no usable associated data from which to produce another element.
Where the result appears
- This result can surface in a compound-document containers, embedded or linked objects, OLE activation, advising, caching, conversion, and persistence.
- map the failure to one concrete operation among IOleObject, IOleLink, IOleCache, IAdviseSink, IPersistStorage, IOleInPlaceObject, monikers, verbs, and client-site callbacks.
- Preserve CLSID, object and client-site identity, storage or moniker, advise cookie, verb, activation state, window generation, and presentation format before releasing or replacing the object that returned this result.
An incident record for this HRESULT must distinguish caller, runtime, provider, and backing resource while testing whether the enumerator has no usable associated data from which to produce another element.
Typical causes and interpretation boundary
The immediate contract boundary is specific: the enumerator has no usable associated data from which to produce another element. Common cause branches include the following:
- The object removed the collection while enumeration was active.
- The enumerator outlived its owner.
- Backing presentation or link data was not initialized.
Confirm the cause branch that explains why the enumerator has no usable associated data from which to produce another element by using call arguments, object state, metadata, device information, or provider traces.
Correct handling and recovery
The primary recovery is to reacquire the enumerator from the current object state and treat a documented terminal condition separately from missing backing data. The result failure report should expose enough enumeration of OLE verbs, advise connections, or related object data state to understand why the enumerator has no usable associated data from which to produce another element without a production debugger.
The owner of it must define idempotency, cancellation, attempt limits, and reconciliation for the failed enumeration of OLE verbs, advise connections, or related object data. Reconcile persistent, remote, device, or ownership state before repeating it.
Practical scenario
An advise enumerator survives object shutdown and fails because its holder has already released the connection table. Record the decisive state for this HRESULT and verify recovery on a fresh object or request generation.
Difference from related HRESULTs
S_FALSE often marks normal end of COM enumeration; it records a failure because associated data is unavailable Tests and telemetry should preserve that boundary for this HRESULT.
Developer and administrator guidance
Developers handling it should make object lifetime and state transitions explicit, preserve the native HRESULT, and keep cleanup paths safe when initialization or output is partial. Build a small container/server fixture that covers loaded, running, in-place active, UI-active, static, linked, and shutdown states.
Broad permission or compatibility changes are inappropriate unless evidence for the enumerator has no usable associated data from which to produce another element points to that layer. Repair for this HRESULT should target only the evidence-backed component, provider, document, device, or configuration.
References
- Microsoft: generic COM and OLE error codes
- Microsoft: IOleObject
- Microsoft: OLE and data-transfer interfaces
- Microsoft: OLE view caching
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