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TPC_E_INVALID_STROKE
Meaning
Windows documents TPC_E_INVALID_STROKE as “TabletPC inking error code. The stroke object was deleted”. In practical terms, it is returned when an ink operation references a stroke object or stroke identifier that is no longer valid.
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 The relevant condition is that an ink operation references a stroke object or stroke identifier that is no longer valid.
Evidence to collect
- Capture 1: stroke ID, owning ink object identity and edit generation.
- Capture 2: delete, split, merge and transform events preceding the call.
- Capture 3: collection membership immediately before the failing operation.
Likely causes
- Possible cause 1: the stroke was deleted from its InkDisp owner.
- Possible cause 2: the caller retained an identifier across an edit that replaced strokes.
- Possible cause 3: a stroke from one ink object is passed to an operation on another.
Diagnostic sequence
- Confirm that the observed path matches this condition: an ink operation references a stroke object or stroke identifier that is no longer valid.
Practical scenario
An eraser removes a stroke while a queued recognition task still holds its ID; generation checks stop the task before it.
Correct handling and retry
- Corrective action 1: resolve stroke IDs against the current ink object at use time.
- Corrective action 2: invalidate cached stroke references after edits.
- Corrective action 3: keep ownership boundaries explicit when copying or combining ink.
Retry guidance. Retry after reacquiring the current stroke; never reuse an object known to have been deleted. When retrying, avoid replay stale strokes, reorder stylus packets or reuse an invalid recognizer context.
Difference from nearby HRESULTs
TPC_E_NOT_RELEVANT reports missing data required for an operation, while it identifies a deleted or otherwise invalid stroke reference.
Developer and operational guidance
Official Microsoft references
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