What does HRESULT 0x000401E4 (MK_S_ME) mean?

 
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MK_S_REDUCED_TO_SELF MK_S_HIM

MK_S_ME

Common moniker prefix is the current moniker

MK_S_ME is HRESULT 262628 (0x000401E4) from winerror.h. AllStat describes this result as “Common prefix is this moniker.” The high-order severity bit is clear, so this is a success result, but it carries more information than plain S_OK.

The common-prefix calculation succeeded and found that this moniker is the shared prefix, usually because it is equal to or an ancestor prefix of the input moniker.

Evidence and telemetry to preserve

  • preserve both display names.
  • preserve moniker classes and component counts.
  • preserve returned prefix pointer.
  • preserve IsEqual result for full monikers.
  • preserve relative-path calculation that follows.

Also record mk_s_me_operation, mk_s_me_object, mk_s_me_state_before, mk_s_me_state_after, UTC time, process and thread identifiers, and a correlation ID. Keep secrets out of logs while retaining GUIDs, CLSIDs, media subtypes, property IDs, row identities, and hashes needed to distinguish objects.

Where the result is encountered

  • This result can appear in IMoniker::CommonPrefixWith; record the producing interface and method rather than inferring behavior from the symbolic name alone.
  • This result can appear in link-path comparison; record the producing interface and method rather than inferring behavior from the symbolic name alone.
  • It can appear in composite moniker navigation; record the producing interface and method rather than inferring behavior from the symbolic name alone.

The same numeric success value can be mishandled when a wrapper exposes only a Boolean. Keep the original HRESULT until the code-specific outputs and state transition have been evaluated.

State boundary that must be proved

The central question for it is whether the caller interprets the returned prefix relationship without assuming the two complete monikers are identical. The HRESULT alone confirms neither unrelated work nor the quality of optional outputs.

A reliable interpretation of it names the exact method contract, the object generation, and the outputs that remain valid. This prevents a success-with-information result from being promoted to full success or demoted to a generic error.

Diagnostic sequence

  • capture the raw HRESULT 0x000401E4 immediately after the returning method and record whether the caller used SUCCEEDED, FAILED, equality testing, or exception translation.
  • Identify the exact owner of it: interface, method, object instance, provider or filter version, thread or apartment, and operation phase.
  • Validate the decisive contract boundary for it: the caller interprets the returned prefix relationship without assuming the two complete monikers are identical.
  • inspect every output parameter, count, status array, returned interface, or side effect that the method documentation associates with this success-with-information result.
  • Compare the observed state before and after it; do not assume that a success severity bit means every optional sub-operation completed.
  • reproduce the smallest request with the same object state and then change only the condition identified by the evidence before repeating the operation.

Difference from nearby HRESULT values

MK_S_HIM chooses the input moniker, while MK_S_US indicates both complete monikers are the common prefix.

This distinction determines whether the caller should consume partial outputs, stop iteration, wait, reconfigure, notify the user, or perform no error recovery at all.

Correct handling, retry, and recovery

Reuse this moniker as the common prefix and compute any relative remainder from the other moniker. Keep equality and prefix containment as separate cases.

Retry it only when the recorded state can change the documented outcome. Repeating the same call is inappropriate for a stable end marker, cancellation, unsupported format, adjusted property, or partial result whose completed side effects have not been reconciled.

Practical validation scenario

A container compares a document moniker with a moniker for an embedded item beneath that document. It identifies the document moniker as the shared prefix used to build a relative item link.

The negative test should preserve the condition that produces it; the recovery test should alter only that condition and verify the final state as well as the HRESULT.

Developer and administrator guidance

When it crosses process, RPC, scripting, or managed-code boundaries, preserve the unsigned 32-bit value and symbolic name. A signed decimal rendering can obscure that the severity bit indicates success and can lead to incorrect exception or retry behavior.

A support report for it should include decimal 262628, hexadecimal 0x000401E4, the AllStat meaning, the owning API, and the first detailed status or output that explains why the method did not return ordinary S_OK.

References

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