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CI_E_BUFFERTOOSMALL
The caller buffer is too small for helper output
CI_E_BUFFERTOOSMALL is HRESULT 0x8004180C (-2147215348 signed; 2147751948 unsigned). Its severity bit is 1, facility is 4 (FACILITY_ITF for these values), and code field is 0x180C. Standard HRESULT severity rules classify the value as a failure. AllStat describes the value as “The buffer is too small.”
State represented by the HRESULT
This result belongs to copying variable-length content-indexing data into caller-provided storage. The decisive interpretation is that the requested result cannot fit in the supplied byte or character capacity. Keep the symbolic constant and method stage together in logs; its hexadecimal value alone cannot identify the owning transition or input.
The legacy content-index helper layer has explicit object, catalog and service states. In the result investigation, a generic retry can hide lifecycle, ordering or policy defects. This context narrows the responsible component without replacing the code-specific checks below.
Likely triggers
- At step 1 for it, the caller assumes a fixed maximum
- At step 2 for it, size units are confused between bytes and characters
- At step 3 for it, the value grows between size query and retrieval
- At step 4 for it, terminator/alignment space is omitted
The useful hypothesis for it must explain both copying variable-length content-indexing data into caller-provided storage and the documented condition. Compare the failing case with a control that preserves supplied size and required size and changes only unit and element width; this prevents unrelated environment differences from dominating the result test.
Data for diagnosis
- This result: Supplied size and required size.
- This result: Unit and element width.
- This result: Property or operation being retrieved.
- It: First and second call timestamps.
Capture supplied size and required size before releasing objects, closing handles or reconnecting. Retain the raw HRESULT with unit and element width, component version, UTC timestamp and correlation ID. Bound the result telemetry to diagnostic metadata because document content, credentials and unrestricted query text may be sensitive.
Investigation order
- Confirm the API sizing convention. Associate this observation specifically with it.
- Use checked arithmetic for allocation. Associate this observation specifically with it.
- Handle growth between probe and copy with a bounded loop. Associate this observation specifically with it.
- Set a reasonable upper limit for corrupt or hostile data. Associate this observation specifically with it.
Change one variable per it control run. Preserve the component version and target identity, then alter only the condition described as the requested result cannot fit in the supplied byte or character capacity. This isolates whether it is causal rather than merely repeatable.
Correct response
Allocate the measured capacity and retry the specific retrieval operation. Do not confuse this with system memory exhaustion. Record whether copying variable-length content-indexing data into caller-provided storage produced any content, update or state transition before returning. If completion remains unknown, the path must not replay non-idempotent work until the owner confirms final state.
The retry gate for it should be a concrete change in supplied size and required size or unit and element width. A timer alone cannot demonstrate that the result contract condition has changed.
Scope of the signal
It does not imply that the property is uncached or too large for the catalog property store. Without the call boundary for copying variable-length content-indexing data into caller-provided storage, it also cannot identify which wrapper or configuration layer introduced the condition.
Related HRESULT values
WBREAK_E_BUFFER_TOO_SMALL is phrase-specific; CI_E_PROPERTY_TOOLARGE concerns cache policy rather than caller storage. In it telemetry, preserve neighboring constants separately because the same visible symptom may require a different caller action, owner or recovery gate.
Developer and administrator actions
- check At the code boundary, keep supplied size and required size beside the returned HRESULT.
- check In telemetry, correlate unit and element width with the target and component generation.
- check For regression coverage, force the documented condition: the requested result cannot fit in the supplied byte or character capacity.
- check For operations staff, expose the corrective state change rather than a generic retry button.
- check After remediation, validate one known-good control and the original failing case.
Example in a pipeline
A property name is retrieved through a two-call API, but the wrapper passes character count as bytes. Unit-aware sizing fixes the failure. In this scenario, handling it at its real contract boundary prevents the application from collapsing a precise state into an unhelpful generic “search failed” message.
Official Microsoft references
- Microsoft: content-indexing helper-function values — official contract information relevant to it.
- Microsoft: Content-Indexing values
- Microsoft: HRESULT values
- Microsoft: Windows Search SQL syntax
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