PreviousInVSet
Read the previous variable-length data record in the set defined by target.
Short Name
PRVVSET()
Type
ISAM function
Declaration
COUNT PreviousInVSet(COUNT filno, pVOID recptr, pVRLEN plen)
Description
PreviousInVSet() is identical to it’s fixed-length counterpart, PreviousInSet(), except that it reads the previous variable-length data record in the set defined by target and siglen. If successful, this record becomes the current ISAM record for the associated data file.
plen acts as both an input and output parameter:
Read the function description for PreviousInSet() for additional important information.
Return
Value |
Symbolic Constant |
Explanation |
---|---|---|
0 |
NO_ERROR |
Successful retrieval of current ISAM record. |
633 |
NPLN_ERR |
plen is NULL. |
634 |
NLEN_ERR |
plen is negative on input. |
See c-tree Error Codes for a complete listing of valid c-tree error values.
See also
PreviousInSet(), FirstInVSet(), NextInVSet(), TransformKey()