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TPC_E_RECOGNIZER_NOT_REGISTERED
Meaning
Windows documents TPC_E_RECOGNIZER_NOT_REGISTERED as “TabletPC inking error code. There are no handwriting recognizers registered”. In practical terms, it is returned when handwriting recognition is requested but no applicable recognizer is registered for the selected language or capability.
Evidence to collect
- Capture 1: enumerated recognizers, language identifiers and capabilities.
- Capture 2: recognizer COM registration and package state.
- Capture 3: process architecture and user-specific versus machine-wide availability.
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 relevant condition is that handwriting recognition is requested but no applicable recognizer is registered for the selected language or capability.
Likely causes
- Possible cause 1: the recognizer package is not installed.
- Possible cause 2: registration was removed or belongs to another architecture.
- Possible cause 3: the requested language has no matching recognizer.
Diagnostic sequence
- Confirm that the observed path matches this condition: handwriting recognition is requested but no applicable recognizer is registered for the selected language or capability.
Correct handling and retry
- Corrective action 1: install or repair a supported recognizer package.
- Corrective action 2: select from recognizers actually enumerated on the host.
- Corrective action 3: provide a non-recognition workflow when the capability is optional.
Retry guidance. Retry after recognizer installation or registration changes; repeating recognition without a recognizer cannot succeed. When retrying, avoid replay stale strokes, reorder stylus packets or reuse an invalid recognizer context.
Difference from nearby HRESULTs
TPC_E_INVALID_RIGHTS means a recognizer exists but its information cannot be read under the current user; this HRESULT means no applicable recognizer is registered.
Developer and operational guidance
Practical scenario
An application hard-codes an English recognizer on a system containing only another language pack; enumerating available recognizers prevents it.
Official Microsoft references
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