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OLE_E_CANTCONVERT
OLE_E_CANTCONVERT: exact failure boundary
0x80040011 corresponds to OLE_E_CANTCONVERT. The platform message is Not able to convert object. This result is returned while OleConvertOLESTREAMToIStorage, class conversion, or object-format migration. The diagnostic question is whether no supported conversion path can transform the object into the requested representation.
Evidence to capture
- Record this result, 0x80040011, the native method name, process and thread IDs, operation ID, component build, architecture, and elapsed time.
- Capture object generation, link or storage identity, activation state, advise cookie, window lifetime, and presentation format.
- Keep IErrorInfo, provider extended status, relevant device/storage events, and the first lower-level failure.
- When handling this result, unadvise only active cookies, release server and site interfaces in the documented order, and preserve storage if the user cancelled or output is uncertain.
Likely causes to separate
- The destination class is not registered.
- The source format lacks a compatible converter.
- Conversion would discard required object data.
Focused diagnostic test
Reproduce the same native call with the same object identity and change one cause candidate at a time. Preserve the first provider or lower-layer result and compare object state before cleanup. A different HRESULT after one controlled change is a new boundary, not proof that the original operation is fully repaired.
Correction
retain the original object, enumerate supported conversions, and require explicit user choice for any lossy replacement.
Verification
After correction, repeat the operation that returned this result. Verify the intended API operation completes and that any output, ownership transfer or persistent state is valid; do not treat disappearance of the dialog alone as success.
Technical references
- Microsoft: generic COM and OLE error codes
- Microsoft: IOleObject
- Microsoft: OLE and data-transfer interfaces
- Microsoft: OLE view caching
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