BKM_QUERYTABTEXT Return Value - tabTextLen

tabTextLen (USHORT)

Length of the tab text string.

BOOKERR_INVALID_PARAMETERS

An invalid page ID was specified for the ulPageId parameter or the structure specified for the pBookText parameter is invalid.
0
No text data has been set (BKM_SETTABTEXT) for the page specified in the ulPageId parameter.
Other
Length of the returned tab text string.

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