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WINCODEC_ERR_WIN32ERROR
The scope of WINCODEC_ERR_WIN32ERROR is a Win32 failure mapped by WIC. A WIC operation failed because a lower Win32 call returned an error that WIC mapped into its facility. Keep 0x88982F94 beside the returning method because a wrapper can replace this distinction with a generic subsystem message.
Common wrong turns
WINCODEC_ERR_INTERNALERROR lacks a known lower system mapping; WIN32ERROR specifically calls for recovering the underlying Win32 status. For WINCODEC_ERR_WIN32ERROR, do not diagnose from 0x88982F94 alone when the original Win32 error can identify access denied, sharing violation, path, registry, or memory failure.
Read the HRESULT in context
When WINCODEC_ERR_WIN32ERROR is returned, this HRESULT preserves the fact that WIC crossed into a lower Win32 operation, but the outer value does not say whether the cause was access, sharing, path, registry, memory, or synchronization. Capture the original Win32 error at the boundary before wrappers or cleanup overwrite thread-local error state in the WINCODEC_ERR_WIN32ERROR path.
For WINCODEC_ERR_WIN32ERROR, inspect the following boundary: file, stream, registry, memory, synchronization, or COM operation at the WIC/Win32 boundary.
Capture before changing state
| Record | Why it matters here |
|---|---|
| Original GetLastError value if available | Comparing original GetLastError value if available shows whether WINCODEC_ERR_WIN32ERROR follows input, object state, or environment. |
| File path or stream identity, access mode, and sharing flags | Preserving file path or stream identity, access mode, and sharing flags provides the evidence needed to test this distinction: wINCODEC_ERR_INTERNALERROR lacks a known lower system mapping; WIN32ERROR specifically calls for recovering the underlying Win32 status. |
| Component CLSID and method | For WINCODEC_ERR_WIN32ERROR, recording component CLSID and method separates the a Win32 failure mapped by WIC boundary from a later wrapper symptom. |
| Thread token, process architecture, and registry view | In WINCODEC_ERR_WIN32ERROR diagnostics, recording thread token, process architecture, and registry view ties the HRESULT to the a Win32 failure mapped by WIC boundary rather than to the final visible failure. |
Three diagnostic branches
| Test | Interpretation | Hold constant |
|---|---|---|
| Same environment, reduced input | If WINCODEC_ERR_WIN32ERROR disappears with a smaller faithful case, complexity within a Win32 failure mapped by WIC is implicated. | For WINCODEC_ERR_WIN32ERROR, keep original GetLastError value if available fixed while simplifying component CLSID and method. |
| Same input, fresh object generation | If WINCODEC_ERR_WIN32ERROR changes after rebuilding state, examine ownership across component discovery, COM activation, stream initialization, codec implementation, and frame operation. | For WINCODEC_ERR_WIN32ERROR, place file path or stream identity, access mode, and sharing flags on the timeline of the last successful transition. |
| Same operation on a controlled second path | If WINCODEC_ERR_WIN32ERROR follows one environment, the failure is not explained by source data alone. | For WINCODEC_ERR_WIN32ERROR, compare codec CLSID, process architecture, COM apartment, stream capabilities, and preferred-component policy while preserving thread token, process architecture, and registry view. |
A minimal test sequence
For WINCODEC_ERR_WIN32ERROR, repeat the operation with an in-memory stream and the same codec. When WINCODEC_ERR_WIN32ERROR is returned, if that works, reproduce file or registry access under the same identity and sharing flags while recording the immediate lower error.
- When WINCODEC_ERR_WIN32ERROR is returned, capture GetLastError immediately at the failing boundary.
- Repeat with a memory-backed stream to separate file I/O in the WINCODEC_ERR_WIN32ERROR path.
- For WINCODEC_ERR_WIN32ERROR, check access and sharing using the same process identity.
- When WINCODEC_ERR_WIN32ERROR is returned, verify no wrapper overwrites the original Win32 code.
Regression verification
A correction for WINCODEC_ERR_WIN32ERROR should let the operation at the a Win32 failure mapped by WIC boundary complete repeatedly under the original supported conditions. Repeat the control that begins with “Capture GetLastError immediately at the failing boundary” and confirm that the following lifecycle step also succeeds. For WINCODEC_ERR_WIN32ERROR, keep the original failing sample and one deliberate negative case so fallback cannot be mistaken for repair.
Technical references
When WINCODEC_ERR_WIN32ERROR is returned, these references define the public API family, object model, or error list used to interpret this status.
- Microsoft: Windows Imaging Component codec error codes.
- Microsoft: Windows Imaging Component overview.
- Microsoft: Implementing IWICBitmapDecoder.
- Microsoft: IWICImagingFactory interface.
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