HRESULT 0x80040001 (TAPI_E_NOTENOUGHMEMORY): meaning and diagnosis

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TAPI output buffer is too small

Could be also:
Constant	Type	OS
OLE_E_ADVF	HRESULT	Windows

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OLE_E_ADVF	OLE_E_ENUM_NOMORE

TAPI_E_NOTENOUGHMEMORY

TAPI output buffer is too small

TAPI_E_NOTENOUGHMEMORY is HRESULT 2147745793 (0x80040001) from TAPI 3.0. AllStat describes it as “The buffer passed in to this method was not big enough.” The result belongs to a TAPI 3 method returning variable-length information through a caller-provided buffer. The symbol this result is useful only when tied to the method and lifecycle phase where the supplied buffer cannot hold the complete result, despite the legacy constant name suggesting general memory exhaustion.

The decisive meaning of this result is that the supplied buffer cannot hold the complete result, despite the legacy constant name suggesting general memory exhaustion. The severity bit does not decide handling; the controlling fact is that the supplied buffer cannot hold the complete result, despite the legacy constant name suggesting general memory exhaustion. A reliable it diagnosis preserves the raw value and reconstructs the state that made this true: the supplied buffer cannot hold the complete result, despite the legacy constant name suggesting general memory exhaustion.

Where the result appears

This result can surface in a TAPI 3 address, call-control, terminal, stream, conference, dialing, or completion-management code.
map the failure to one concrete operation among ITTAPI, ITAddress, ITBasicCallControl, ITCallInfo, terminal and stream interfaces, provider events, and asynchronous request state.
Preserve provider name and version, address and call IDs, device class, media type, privilege, current address and call states, and asynchronous request ID before releasing or replacing the object that returned this result.

An incident record for this HRESULT must distinguish caller, runtime, provider, and backing resource while testing whether the supplied buffer cannot hold the complete result, despite the legacy constant name suggesting general memory exhaustion.

Typical causes and interpretation boundary

The immediate contract boundary is specific: the supplied buffer cannot hold the complete result, despite the legacy constant name suggesting general memory exhaustion. Common cause branches include the following:

The caller used a fixed buffer.
The required size changed between query and retrieval.
Structure-size and character-width calculations disagree.

Confirm the cause branch that explains why the supplied buffer cannot hold the complete result, despite the legacy constant name suggesting general memory exhaustion by using call arguments, object state, metadata, device information, or provider traces.

Correct handling and recovery

The primary recovery is to read the required size when available, allocate with overflow checks, and repeat the retrieval without changing the logical request. The result failure report should expose enough a TAPI 3 method returning variable-length information through a caller-provided buffer state to understand why the supplied buffer cannot hold the complete result, despite the legacy constant name suggesting general memory exhaustion without a production debugger.

The owner of it must define idempotency, cancellation, attempt limits, and reconciliation for the failed a TAPI 3 method returning variable-length information through a caller-provided buffer. Reconcile persistent, remote, device, or ownership state before repeating it.

Practical scenario

A telephony client requests address information into a legacy fixed array, then switches to a two-pass size query and retrieval. Record the decisive state for this HRESULT and verify recovery on a fresh object or request generation.

Difference from related HRESULTs

E_OUTOFMEMORY means allocation failed; it commonly means the method buffer is too small Tests and telemetry should preserve that boundary for this HRESULT.

Developer and administrator guidance

Developers handling it should make object lifetime and state transitions explicit, preserve the native HRESULT, and keep cleanup paths safe when initialization or output is partial. Use a controllable service provider or simulator to cover state races, capability differences, device removal, cancellation, and provider restart.

Broad permission or compatibility changes are inappropriate unless evidence for the supplied buffer cannot hold the complete result, despite the legacy constant name suggesting general memory exhaustion points to that layer. Repair for this HRESULT should target only the evidence-backed component, provider, document, device, or configuration.

References

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