What does HRESULT 0xC0AA050F (E_IMAPI_DF2TAO_CLIENT_NAME_IS_NOT_VALID) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: the Track-at-Once IMAPI client name is invalid.

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E_IMAPI_DF2TAO_RECORDER_NOT_SUPPORTED	E_IMAPI_DF2RAW_WRITE_IN_PROGRESS

E_IMAPI_DF2TAO_CLIENT_NAME_IS_NOT_VALID

E_IMAPI_DF2TAO_CLIENT_NAME_IS_NOT_VALID reports invalid application identification on the Track-at-Once format object. Microsoft requires put_ClientName before PrepareMedia, so a bad value prevents the media session from being prepared.

Validate the client name before locking the medium

Log the exact client-name string and whether the setter succeeded.
Use a stable application-friendly name rather than audio title, ISRC or a per-track filename.
Do not call PrepareMedia until put_ClientName has returned success.

The client name identifies the application using IMAPI; it is not disc metadata. Changing the MCN, ISRC or PCM stream cannot correct this error. Keeping client initialization in one setup function also avoids a common sequencing problem where one code path sets the recorder but skips the client-name assignment before preparation.

ClientName · PrepareMedia · IMAPI return values

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