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STG_E_EXTANTMARSHALLINGS
STG_E_EXTANTMARSHALLINGS: diagnose the owning boundary
STG_E_EXTANTMARSHALLINGS (0x80030108) is documented as Illegal operation called on object with extant marshallings. Treat that wording as the specific structured-storage outstanding marshaling state boundary; it is more useful than a generic “component failed” label.
Evidence that matters
Record storage/interface identity, marshaled references and apartment/process owners. Release outstanding marshal data before performing the operation that requires exclusive storage state.
Interpretation and verification
Keep the affected object and caller identity stable while changing only the rejected prerequisite. The correction is proven when the original operation crosses this boundary with the intended state or output. If a different HRESULT appears afterward, preserve it as a separate later-stage result rather than folding it back into STG_E_EXTANTMARSHALLINGS.
Technical references
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