What does HRESULT 0x80040212 (TPC_E_NO_DEFAULT_TABLET) mean?

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TPC_E_NO_DEFAULT_TABLET means the Tablet PC API could not find a tablet device configured as the default input tablet.

Could be also:
Constant	Type	OS
VFW_E_SIZENOTSET	HRESULT	Windows

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VFW_E_NOT_COMMITTED	VFW_E_SIZENOTSET

TPC_E_NO_DEFAULT_TABLET

Meaning

Windows documents TPC_E_NO_DEFAULT_TABLET as “TabletPC inking error code. No default tablet”. In practical terms, it is returned when Tablet PC input code requests the system default tablet device but no default tablet is available.

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 Tablet PC input code requests the system default tablet device but no default tablet is available.

Evidence to collect

Capture 1: tablet enumeration results and default-device query.
Capture 2: device-manager state, driver version and service status.
Capture 3: session type, remote-desktop state and hardware arrival events.

Likely causes

Possible cause 1: no pen or compatible digitizer is installed or enabled.
Possible cause 2: the tablet service has not enumerated a default device.
Possible cause 3: the application runs in a session where the device is not exposed.

Diagnostic sequence

Confirm that the observed path matches this condition: Tablet PC input code requests the system default tablet device but no default tablet is available.

Practical scenario

An ink toolbar starts on a desktop without a digitizer and assumes a default tablet; capability detection prevents it.

Correct handling and retry

Corrective action 1: handle absence of tablet hardware as a supported capability state.
Corrective action 2: refresh enumeration after device arrival.
Corrective action 3: fall back to mouse, touch or non-ink input when product requirements allow.

Retry guidance. Retry after a tablet-added event or service recovery; do not poll continuously on systems that intentionally have no tablet. When retrying, avoid replay stale strokes, reorder stylus packets or reuse an invalid recognizer context.

Difference from nearby HRESULTs

TPC_E_INITIALIZE_FAIL means tablet infrastructure initialization failed, while it can be a valid no-device configuration.

Developer and operational guidance

Official Microsoft references

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