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DISP_E_UNKNOWNLCID
Automation call uses an unsupported locale identifier
DISP_E_UNKNOWNLCID is HRESULT 2147614732 (0x8002000C) from winerror.h. The documented description is “Unknown language.” The value must be interpreted at IDispatch name lookup or invocation that requests locale-sensitive conversion.
The target does not recognize or support the supplied LCID for the requested operation.
Where the result appears
- This result is returned while Automation binds or executes IDispatch name lookup or invocation that requests locale-sensitive conversion.
Typical causes and interpretation
Common cause categories are: an invalid LCID is passed; the component supports only invariant or installed locales; a remote system lacks the locale data. The candidate causes are alternatives, so test one precondition at a time instead of applying several broad repairs together.
Key distinction: the target does not recognize or support the supplied LCID for the requested operation.
Evidence to preserve
- Record this result with the object CLSID or ProgID, interface identity, member DISPID, dispatch flags, and type-library version.
- Capture LCID value; user and system locale; target-supported locales; conversion being attempted; type-library locale.
Telemetry should be reproducible without copying secret values: prefer GUIDs, lengths, flags, sanitized names, and correlation IDs.
Correct handling and recovery
The appropriate recovery is to use a documented supported LCID, prefer invariant typed values, and avoid guessing locale from display language.
Practical scenario
A client passes a custom LCID copied from configuration; switching to the application’s supported locale restores name lookup.
Difference from related HRESULTs
TYPE_E_UNKNOWNLCID occurs while loading or creating type information; it occurs during live Automation dispatch.
Keeping it separate from its neighbor improves retry, cleanup, and user messaging because the two results imply different postconditions.
References
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