If the contents member of the ctNOTBLK contains ctNT_CON_UNQKEY, the notification message contains in the variable portion, just after the ctNOTBLK, information about the unique key generated. The information is stored in this way:
FILNO rkeyno;
COUNT keylen;
TEXT key[]; /* buffer of keylen bytes */
If action is ctNT_RWTREC there is an additional field
TEXT oldkey[]; /* buffer of keylen bytes */
rkeyno is the index number, starting from 1 relative to the data file (1 is the first index, 2 the second index...). It is set to 0 if there is no unique index.
keylen is the length of the key.
key is a buffer of keylen bytes containing the key stored now in the index file.
oldkey is a buffer of keylen bytes containing the old key stored in the index file before an update, whether or not the key changed.
