What does HRESULT 0x800401C0 (CONVERT10_E_OLESTREAM_GET) mean?

Status / error code:

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Constant name:

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Facility:

Operating System:

Description:

The OLESTREAM Get callback failed while reading OLE 1 data.

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INPLACE_E_NOTOOLSPACE	CONVERT10_E_OLESTREAM_PUT

CONVERT10_E_OLESTREAM_GET

OLESTREAM Get method failed

The native value 0x800401C0 is CONVERT10_E_OLESTREAM_GET, unsigned 2147746240 and signed -2147221056. According to AllStat, it means “OLESTREAM Get method failed”. Treat it as evidence that the OLESTREAM Get callback failed while reading OLE 1 data; the operation in progress is converting an OLE 1 stream into OLE 2 structured storage.

The high bit in 0x800401C0 is set, so this is a failure rather than a success or informational result. Its facility field is 4 (FACILITY_ITF) and its low 16-bit code is 448 (0x01C0). Those bit fields classify the value, but they do not identify the failing object by themselves; the native method, object identity, and first producer of this result remain essential.

Operational meaning

Understanding this result requires this subsystem context: OLE 1/OLE 2 conversion combines callback I/O, binary parsing, structured storage, and presentation conversion. Retaining the stage and byte offset is essential because a read failure, format failure, missing stream, and GDI failure require different repairs.

Associate this result with one exact operation in OleConvertOLESTREAMToIStorage, OleConvertIStorageToOLESTREAM, OLESTREAM callbacks, structured-storage streams, and presentation-data conversion.
Confirm that this result came from converting an OLE 1 stream into OLE 2 structured storage, rather than from cleanup or a wrapper that ran afterward.
Preserve any IErrorInfo, underlying Win32 result, provider message, or callback failure that preceded it; the HRESULT alone should not erase a more specific cause.

Cause model

It can result when the callback returns fewer bytes than required without a valid end condition.
It can result when the source file, memory block, or transport becomes unreadable.
It can result when callback context, offset, or lifetime is invalid.

Troubleshooting workflow

Capture it at the first native return before a wrapper maps it to a generic exception.
Identify the exact object, method, and lifecycle phase involved in converting an OLE 1 stream into OLE 2 structured storage.
Log each requested and returned byte count and callback status.
Record source offset and whether earlier reads succeeded.
Verify that the callback context remains valid for the entire conversion.
Reproduce it with one controlled input or state change, and verify that the correction changes the decisive evidence rather than merely hiding the result.

What to log

A useful incident records the conversion direction, OLESTREAM Get or Put callback result, requested byte count, actual byte count, storage class, stream names, presentation format, bitmap or DIB metadata, and commit state. Also retain the application and component build, architecture, process and thread IDs, COM apartment, operation correlation ID, elapsed time, and the first state-changing event before the failure. When logging it, redact content and credentials while preserving types, lengths, hashes, opaque identities, and lifecycle generations needed to reproduce its contract.

Correction strategy

Correction. for it, repair the source or callback, restart conversion into a fresh uncommitted storage, and discard partial output. Retry boundary. Retry from the beginning after input becomes readable; resuming at an inferred offset can misparse object records. Before repeating the operation, record stream positions and byte counts, release temporary GDI objects, and discard or roll back any output storage that was only partly written.

Practical scenario

A migration tool closes the input file before OleConvertOLESTREAMToIStorage finishes; keeping the handle alive through the call restores all reads. This isolates it within OLE 1/OLE 2 storage conversion and provides a regression test for the stated correction.

Difference from related HRESULTs

CONVERT10_E_OLESTREAM_FMT means bytes were read but the OLE 1 format is invalid; it means acquisition itself failed. Keep those outcomes separate in exception mappings, telemetry dimensions, user messages, and automated retry policy.

Developer and administrator guidance

Make OLESTREAM callbacks report exact byte counts, validate format headers before allocating, preserve structured-storage commit boundaries, and separate bitmap from DIB ownership. Regression coverage for it should include short reads and writes, invalid format records, absent standard streams, truncated presentation data, large dimensions, callback errors, and failure before versus after storage commit.

Operational repair for it must target the evidence-backed owner: preserve the original document and reproduce with a copy; repair the producing application or converter only after the failing conversion stage and file provenance are identified. Retain before-and-after traces for it so the change can be attributed and reversed.

References

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