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TPC_S_TRUNCATED
Tablet PC recognizer returned truncated text
TPC_S_TRUNCATED is HRESULT 262738 (0x00040252) from winerror.h. AllStat describes this result as “TabletPC inking error code; String was truncated.” The high-order severity bit is clear, so this is a success result, but it carries more information than plain S_OK.
The ink or recognition operation succeeded but the output string was shortened to fit an available limit.
Evidence and telemetry to preserve
- preserve recognizer identity and language.
- preserve input stroke count.
- preserve output capacity and actual length.
- preserve original versus displayed text.
- preserve Unicode conversion and terminating-null handling.
Also record tpc_s_truncated_operation, tpc_s_truncated_object, tpc_s_truncated_state_before, tpc_s_truncated_state_after, UTC time, process and thread identifiers, and a correlation ID. Keep secrets out of logs while retaining GUIDs, CLSIDs, media subtypes, property IDs, row identities, and hashes needed to distinguish objects.
Where the result is encountered
- This result can appear in handwriting recognition results; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- This result can appear in training or personalization UI; record the producing interface and method rather than inferring behavior from the symbolic name alone.
- It can appear in legacy Tablet PC COM applications copying recognizer text into fixed buffers; record the producing interface and method rather than inferring behavior from the symbolic name alone.
The same numeric success value can be mishandled when a wrapper exposes only a Boolean. Keep the original HRESULT until the code-specific outputs and state transition have been evaluated.
State boundary that must be proved
The central question for this HRESULT is whether the application knows the full required length or can request the complete result without losing character boundaries. The HRESULT alone confirms neither unrelated work nor the quality of optional outputs.
A reliable interpretation of it names the exact method contract, the object generation, and the outputs that remain valid. This prevents a success-with-information result from being promoted to full success or demoted to a generic error.
Diagnostic sequence
- capture the raw HRESULT
0x00040252immediately after the returning method and record whether the caller usedSUCCEEDED,FAILED, equality testing, or exception translation. - Identify the exact owner of it: interface, method, object instance, provider or filter version, thread or apartment, and operation phase.
- Validate the decisive contract boundary for this HRESULT: the application knows the full required length or can request the complete result without losing character boundaries.
- inspect every output parameter, count, status array, returned interface, or side effect that the method documentation associates with this success-with-information result.
- Compare the observed state before and after it; do not assume that a success severity bit means every optional sub-operation completed.
- reproduce the smallest request with the same object state and then change only the condition identified by the evidence before repeating the operation.
Difference from nearby HRESULT values
INPLACE_S_TRUNCATED is an OLE in-place UI status; it belongs to Tablet PC ink and recognition output.
This distinction determines whether the caller should consume partial outputs, stop iteration, wait, reconfigure, notify the user, or perform no error recovery at all.
Correct handling, retry, and recovery
Present the available prefix only as partial data, allocate a larger destination when supported, and preserve the recognition result object until the full text is obtained.
Retry it only when the recorded state can change the documented outcome. Repeating the same call is inappropriate for a stable end marker, cancellation, unsupported format, adjusted property, or partial result whose completed side effects have not been reconciled.
Practical validation scenario
A note application recognizes a long handwritten line into a legacy fixed buffer. It detects it, queries the result through the recognition object, and stores the complete Unicode text.
The negative test should preserve the condition that produces it; the recovery test should alter only that condition and verify the final state as well as the HRESULT.
Developer and administrator guidance
When it crosses process, RPC, scripting, or managed-code boundaries, preserve the unsigned 32-bit value and symbolic name. A signed decimal rendering can obscure that the severity bit indicates success and can lead to incorrect exception or retry behavior.
A support report for this HRESULT should include decimal 262738, hexadecimal 0x00040252, the AllStat meaning, the owning API, and the first detailed status or output that explains why the method did not return ordinary S_OK.
References
- Microsoft: COM success codes
- Microsoft: Pen input, ink, and recognition
- Microsoft: IInkRecognizerContext::Recognize
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