HRESULT 0x8004023A (TPC_E_INVALID_DATA_FROM

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Constant name:

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Description:

Evidence and retry guidance for a recognizer returned invalid data.

Could be also:
Constant	Type	OS
VFW_E_NO_FULLSCREEN	HRESULT	Windows

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VFW_E_NO_ADVISE_SET	VFW_E_NO_FULLSCREEN

TPC_E_INVALID_DATA_FROM_RECOGNIZER

Meaning and numerical form

TPC_E_INVALID_DATA_FROM_RECOGNIZER is HRESULT 2147746362 (0x8004023A; signed -2147220934). AllStat records its meaning as “TabletPC inking error code. A recognizer returned invalid data”. In practical terms, it is returned when a handwriting recognizer returns data that violates the Tablet PC recognition contract.

The severity bit in 0x8004023A is set, so this result is a failure result rather than a success or informational status. Its facility is 4 (FACILITY_ITF) and its low 16-bit code is 570 (0x023A). Those fields classify the value but do not identify the component instance, call, object or input that produced it.

Where the failure belongs

This result belongs to Tablet PC ink, stylus and recognition. Tablet PC APIs span device enumeration, RealTimeStylus packet queues, ink-object lifetime and recognizer-specific capabilities. The numerical facility does not identify which Tablet PC layer produced the result. The decisive condition is this: a handwriting recognizer returns data that violates the Tablet PC recognition contract. Record the first native producer instead of relying only on a framework exception translated several layers later.

Do not infer from this result alone that reinstalling, rebooting or repeating the whole workflow is appropriate. Because it can cross process and language boundaries, its correction depends on the object identity, lifecycle generation, input and state at the first failing call.

Diagnostic sequence

Capture this result at the first native return and identify the exact object and method.
Confirm that the observed path matches this condition: a handwriting recognizer returns data that violates the Tablet PC recognition contract.
compare the live state with the method contract before changing configuration.
collect the code-specific evidence listed above and preserve any more specific preceding error.
change one evidence-backed cause at a time, then repeat the smallest operation that can prove the correction.
Add a regression check that distinguishes it from the related outcomes described below.

Likely causes

Possible cause 1 for this HRESULT: the recognizer produces malformed lattice, range or property data.
Possible cause 2 for this HRESULT: a third-party recognizer version is incompatible with the platform.
Possible cause 3 for this HRESULT: memory corruption or incorrect marshaling alters returned structures.

Evidence to collect

A useful it record includes the native API or interface method, component or CLSID, process and thread IDs, architecture, apartment where relevant, operation correlation ID, elapsed time, input identity, and the first state-changing event before failure. When diagnosing it, preserve IErrorInfo, an inner HRESULT, Win32 status, device event or provider message when available.

Capture 1 for this HRESULT: recognizer identity, version, language and capability flags.
Capture 2 for this HRESULT: sizes, counts and bounds of returned structures before application parsing.
Capture 3 for this HRESULT: the smallest ink sample that reproduces the invalid output.

Telemetry for this HRESULT should retain types, lengths, hashes, stable opaque identifiers and lifecycle generations while redacting content and credentials. This makes repeated incidents comparable without exposing ink content, packet data, account details or recognizer input.

Correction and retry boundary

Corrective action 1 for this HRESULT: update, repair or remove the faulty recognizer.
Corrective action 2 for this HRESULT: validate all recognizer output before use.
Corrective action 3 for this HRESULT: isolate the failing recognizer and retain a minimal ink sample for the vendor.

Retry guidance for this HRESULT. Retry with the same recognizer only if the failure was transient and no malformed output is reused; otherwise select another recognizer or skip recognition. A retry must avoid this hazard: replay stale strokes, reorder stylus packets or reuse an invalid recognizer context. It must also preserve the evidence needed to locate the original producer of it.

Practical scenario

A third-party recognizer returns a lattice count larger than its allocated array for one ink sample; validation catches the contract violation behind it. The result scenario narrows the result to a reproducible contract boundary and supplies a concrete before-and-after test.

Developer and operational guidance

Code handling it should log the failed stage before cleanup, keep ownership and lifecycle transitions explicit, and avoid converting every failure into a generic message. Tests for this HRESULT should cover the primary cause, one adjacent HRESULT and the retry boundary so a future change cannot turn a deterministic contract failure into an uncontrolled loop.

Operational repair for this HRESULT should use supported device, Tablet PC component, recognizer and application lifecycle paths. Avoid unsupported configuration edits or component replacement unless evidence identifies that layer. Retain the original trace and a post-fix trace so the result can be attributed and the change reversed.

Difference from nearby HRESULTs

TPC_E_RECOGNIZER_NOT_REGISTERED means no recognizer is available; it means one ran but returned unusable data. Keep these outcomes separate in logs, exception mappings, user messages, dashboards and automated retry policy.

Official Microsoft references

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