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CONVERT10_E_STG_DIB_TO_BITMAP
There was an error in a Windows GDI call while converting the DIB to a bitmap.
CONVERT10_E_STG_DIB_TO_BITMAP has hexadecimal value 0x800401C6 (unsigned 2147746246, signed -2147221050). Windows reports “There was an error in a Windows GDI call while converting the DIB to a bitmap.” The narrow interpretation is that a Windows GDI call failed while converting stored DIB presentation data to an OLE 1 bitmap. The failing stage is exporting OLE 2 presentation data during conversion to an OLE 1 stream.
API stage
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 exporting OLE 2 presentation data during conversion to an OLE 1 stream, rather than from cleanup or a wrapper that ran afterward.
Verification steps
- Identify the exact object, method, and lifecycle phase involved in exporting OLE 2 presentation data during conversion to an OLE 1 stream.
- Capture BITMAPINFOHEADER fields and total buffer length.
- Validate color-table and pixel offsets before passing data to GDI.
- Test a normalized compatible DIB copy while preserving the original evidence.
Interpretation limits
- It can result when the DIB header, color table, stride, or pixel extent is inconsistent.
- It can result when GDI resources cannot be created in the current session.
- It can result when the DIB format is valid for modern consumers but unsupported by the legacy bitmap conversion path.
Incident record
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.
Recovery conditions
Correction. normalize the presentation to a legacy-compatible DIB or regenerate it from the live object before conversion. Retry condition. Retry after format normalization or resource recovery; do not alter object-native data merely to satisfy the presentation path. 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 32-bit alpha DIB cannot be represented by the target legacy path; rendering the object into a compatible 24-bit presentation enables export.
Difference from related HRESULTs
CONVERT10_E_OLESTREAM_BITMAP_TO_DIB is the opposite direction, importing a legacy bitmap into DIB form.
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 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.
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.
References
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