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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