HRESULT 0x80028CA2 (TYPE_E_IOERROR): meaning and diagnosis

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I/O failure while reading or writing a type library

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TYPE_E_OUTOFBOUNDS	TYPE_E_CANTCREATETMPFILE

TYPE_E_IOERROR

I/O failure while reading or writing a type library

TYPE_E_IOERROR is HRESULT 2147650722 (0x80028CA2) from winerror.h. AllStat describes it as “I/O Error.” The result belongs to loading, saving, registering, or generating a TLB resource or file. Interpret this result at the native boundary before a wrapper hides the condition that the type-library operation could not complete an underlying read, write, seek, flush, or resource access.

The decisive meaning of this result is that the type-library operation could not complete an underlying read, write, seek, flush, or resource access. The severity bit does not decide handling; the controlling fact is that the type-library operation could not complete an underlying read, write, seek, flush, or resource access. The symbol it is useful only when tied to the method and lifecycle phase where the type-library operation could not complete an underlying read, write, seek, flush, or resource access.

Where the result appears

This result can surface in a type-library compiler, importer, registration step, proxy generator, or Automation metadata consumer.
map the failure to one concrete operation among LoadTypeLib, RegisterTypeLib, ITypeInfo, ICreateTypeInfo, FUNCDESC, TYPEDESC, and imported LIBID versions.
Preserve LIBID, type-library version, LCID, SYSKIND, TYPEKIND, GUID, MEMBERID, HREFTYPE, and the producer toolchain before releasing or replacing the object that returned this result.

An incident record for this HRESULT must distinguish caller, runtime, provider, and backing resource while testing whether the type-library operation could not complete an underlying read, write, seek, flush, or resource access.

Typical causes and interpretation boundary

The immediate contract boundary is specific: the type-library operation could not complete an underlying read, write, seek, flush, or resource access. Common cause branches include the following:

The TLB file is truncated or stored on an unavailable share.
The destination directory denies creation or replacement.
An antivirus or deployment process races the generator while it writes the file.

Confirm the cause branch that explains why the type-library operation could not complete an underlying read, write, seek, flush, or resource access by using call arguments, object state, metadata, device information, or provider traces.

Correct handling and recovery

The primary recovery is to repeat only after verifying the exact file, storage health, permissions, and atomic replacement path; otherwise regenerate from source. The result failure report should expose enough loading, saving, registering, or generating a TLB resource or file state to understand why the type-library operation could not complete an underlying read, write, seek, flush, or resource access without a production debugger.

A UI loop must not repeat it without refreshing the state behind “the type-library operation could not complete an underlying read, write, seek, flush, or resource access” and checking for prior side effects. Reconcile persistent, remote, device, or ownership state before repeating it.

Practical scenario

A build writes a type library to a network output directory and loses the connection during final serialization, leaving a partial file that later imports cannot trust. Record the decisive state for this HRESULT and verify recovery on a fresh object or request generation.

Difference from related HRESULTs

TYPE_E_CANTLOADLIBRARY is specifically about loading a library or DLL; it identifies a lower-level data transfer failure Tests and telemetry should preserve that boundary for this HRESULT.

Developer and administrator guidance

Developers handling it should make object lifetime and state transitions explicit, preserve the native HRESULT, and keep cleanup paths safe when initialization or output is partial. Use a minimal IDL or metadata fixture that reproduces the exact graph, then validate both 32-bit and 64-bit generated artifacts.

Dashboards should keep it distinct and attach dimensions that can prove or disprove: the type-library operation could not complete an underlying read, write, seek, flush, or resource access. Repair for this HRESULT should target only the evidence-backed component, provider, document, device, or configuration.

References

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