FairCom ISAM for C

ReReadRecord

Reread current ISAM record.

Short Name

RRDREC()

Type

ISAM function

Declaration

COUNT ReReadRecord(FILNO datno, pVOID recptr)

Description

In V12 the file number typedef was formally changed from COUNT, a two-byte value to FILNO, a four-byte value. Refer to this link for compatibility details. Four Byte File Numbering

ReReadRecord() provides a simple way to reread the current ISAM record for fixed-length data records belonging to data file number datno. The record is read into the record buffer pointed to by recptr. Use ReReadVRecord() to reread the current ISAM record for a variable-length data file, unless only the fixed-length portion of the variable-length record is needed.

As of c-tree V8.14, c-tree sets the current ISAM position after a record is added such that the next or previous record can be read without having to re-read the record just added. Prior to V8.14, the current ISAM position was not set to a newly-added record and an INOT_ERR (101) error would result if you tried to read either the next or previous record.

Return

Value	Symbolic Constant	Explanation
0	NO_ERROR	Successful read of current ISAM record.
33	DNUL_ERR	recptr is NULL. No data file read performed.
42	DLOK_ERR	Could not get lock on data record. No data file read performed.
100	ICUR_ERR	No current ISAM record.
160	ITIM_ERR	Record deleted by another user.

See c-tree Error Codes for a complete listing of valid c-tree error values.

Example

FILNO datno;

TEXT buffer[256];

if (LockISAM(ctENABLE) || ReReadRecord(datno,buffer)) {

printf("\nCould not reread record (%d)",isam_err);

LockISAM(ctFREE);

return(-1);

}