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MF_E_INVALIDINDEX
Where the result originates
MF_E_INVALIDINDEX means an index is outside the collection, stream, type, or attribute range exposed by the object.
The result comes from the collection-style method that validates the numeric index. A representative case is a client caches a stream count, the source changes presentation, and a later call reuses an index that no longer exists.
Read the call sequence as a timeline. First, the application reaches the collection-style method that validates the numeric index. Next, the component evaluates an index is outside the collection, stream, type, or attribute range exposed by the object. A wrapper, user interface, or fallback path can report a less specific message afterward.
Evidence that survives retries
- Exact request: method name, all identifiers, units, flags, stream number, requested action, and this result.
- Object state: the requested index, current count, stream selection, object instance, and whether the collection changed asynchronously.
- Correlation: callback cookie, object instance, URL or file identity, device identity, and timestamps from the same attempt.
- Underlying cause: the first Win32, COM, network, driver, policy, or component error reported before
0xC00D36BF.
A controlled verification sequence
Use one controlled experiment: query the current count and retry the last valid index without reusing a stale enumeration result. A useful comparison for this result changes exactly that variable; changing content, account, proxy, device, components, and version together makes attribution impossible.
| Outcome | Interpretation |
|---|---|
| The same operation now succeeds | The changed precondition was relevant to the failure. |
| A more specific earlier HRESULT appears | Preserve it; this result was probably a wrapper or terminal state. |
| The operation advances and fails later | The condition is fixed even though the complete workflow still has another defect. |
| No behavior changes | Restore the original baseline and test another documented prerequisite instead of stacking workarounds. |
Nearby results that mean something else
| Related code | Why it is not interchangeable |
|---|---|
MF_E_INVALIDTYPE | Invalid type. |
MF_E_INVALIDNAME | Invalid name. |
MF_E_UNEXPECTED | An unexpected error has occurred in the operation requested. |
The important distinction is this: MF_E_NOT_FOUND can occur when a valid key has no object, whereas this code rejects the numeric position itself. Use the symbolic constant and 0xC00D36BF value to distinguish states that share a similar visible message.
Repair at the owning layer
Apply the narrow remedy: refresh the collection and use an index below the current count; stable IDs are preferable across asynchronous changes. Then discard stale media objects, pending callbacks, cached provider sessions, or installer state as appropriate and rerun the exact request that originally returned it.
References
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