What does HRESULT 0x8002000A (DISP_E_OVERFLOW) mean?

 
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DISP_E_EXCEPTION DISP_E_BADINDEX

DISP_E_OVERFLOW

Automation numeric conversion overflowed

DISP_E_OVERFLOW is HRESULT 2147614730 (0x8002000A) from winerror.h. AllStat describes it as “Out of present range.” The value must be interpreted at IDispatch argument coercion or result conversion involving bounded Automation numeric types, because the same high-level symptom can come from a different contract boundary and require different cleanup.

The decisive interpretation for DISP_E_OVERFLOW is that a mathematically valid value lies outside the representable range of the destination VARTYPE. For reliable triage of DISP_E_OVERFLOW, store the native HRESULT and symbolic identity before generic error handling rewrites either one.

Where the result appears

  • DISP_E_OVERFLOW is returned while Automation binds or executes IDispatch argument coercion or result conversion involving bounded Automation numeric types.
  • For DISP_E_OVERFLOW, retain the member name and DISPID, invocation flags, LCID, cArgs, cNamedArgs, and the exact VARIANTARG sequence in reverse Automation order.
  • The output contract for DISP_E_OVERFLOW includes puArgErr, EXCEPINFO, result VARIANT, by-reference values, and SAFEARRAY lock or ownership state; inspect them before cleanup.

The root-cause boundary for DISP_E_OVERFLOW is the component that returned it, not the application screen on which the result was eventually displayed.

Typical causes and interpretation boundary

Common cause categories for DISP_E_OVERFLOW are: a 64-bit value is coerced to 32-bit; currency scaling exceeds range; unsigned data enters a signed parameter; text parses to a huge number. Investigate DISP_E_OVERFLOW through falsifiable cause hypotheses and keep the first lower-level failure that explains the observed HRESULT.

The check that separates DISP_E_OVERFLOW from nearby HRESULTs is: a mathematically valid value lies outside the representable range of the destination VARTYPE. Use the decisive condition for DISP_E_OVERFLOW as a test assertion; if it cannot be asserted, diagnosis is not complete.

Evidence and telemetry

  • Record DISP_E_OVERFLOW with the object CLSID or ProgID, interface identity, member DISPID, dispatch flags, and type-library version.
  • For DISP_E_OVERFLOW, capture source value and VARTYPE; destination VARTYPE; sign; locale conversion; array index or argument index.
  • Log VARIANT type tags, dimensions, bounds, lengths, and null/empty distinctions for DISP_E_OVERFLOW, but redact actual confidential argument values.
  • Preserve the caller language/runtime, generated interop version, LCID, and whether the call crossed a process boundary when DISP_E_OVERFLOW occurs.
  • After DISP_E_OVERFLOW, call VariantClear, SysFreeString, SafeArrayDestroy, or release interfaces only for values whose ownership was transferred by the documented contract.

Logs for DISP_E_OVERFLOW should expose enough structure to reproduce the failure without becoming a secondary store of sensitive input data.

Diagnostic sequence

  • Capture DISP_E_OVERFLOW (0x8002000A) at IDispatch::GetIDsOfNames or IDispatch::Invoke before the language runtime converts it to a script exception.
  • For <code>DISP_E_OVERFLOW</code>, resolve the deployed member signature from ITypeInfo and compare its DISPIDs, parameter flags, VARTYPEs, optional values, and property-put rules with the caller.
  • Prove the decisive condition for DISP_E_OVERFLOW: a mathematically valid value lies outside the representable range of the destination VARTYPE.
  • Inspect the likely binding or representation causes for DISP_E_OVERFLOW: a 64-bit value is coerced to 32-bit; currency scaling exceeds range; unsigned data enters a signed parameter; text parses to a huge number.
  • Reconstruct DISPPARAMS exactly, including reverse positional ordering and named argument placement, then reproduce DISP_E_OVERFLOW with the smallest value set.
  • Verify the result VARIANT, EXCEPINFO, puArgErr, by-reference arguments, SAFEARRAY lock count, and object state after DISP_E_OVERFLOW before deciding on retry.

Correct handling and recovery

For DISP_E_OVERFLOW, the appropriate recovery is to range-check before Invoke, select a wider declared type, and preserve exact decimal values rather than narrowing implicitly. Do not loop on DISP_E_OVERFLOW; retry only under a documented transient condition with bounded delay and post-operation reconciliation.

After observing DISP_E_OVERFLOW, separate local resource cleanup from server-side reconciliation and perform each only for the failing activity ID.

Practical scenario

A counter exceeds LONG_MAX while a legacy method accepts VT_I4; the client switches to the newer VT_I8 interface.

The acceptance test for DISP_E_OVERFLOW should prove that the proposed repair changes the predicted contract fact rather than merely hiding the message.

Difference from related HRESULTs

DISP_E_TYPEMISMATCH means conversion is not meaningful; DISP_E_OVERFLOW means conversion is meaningful but the value is too large or small.

Preserve the neighboring-result distinction for DISP_E_OVERFLOW in metrics and incident reports to avoid applying the wrong remediation.

Developer and administrator guidance

Automation adapters should handle DISP_E_OVERFLOW at the dispatch boundary and expose the member, parameter, and type information needed to repair the call. A generic retry after <code>DISP_E_OVERFLOW</code> with unchanged DISPPARAMS usually repeats the same deterministic binding error.

For DISP_E_OVERFLOW, deployment owners should compare the registered type library and server binary as one versioned unit. After <code>DISP_E_OVERFLOW</code>, re-registering arbitrary DLLs or changing locale system-wide is inappropriate unless the captured metadata proves registration or LCID drift.

References

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