Product Documentation

FairCom ISAM for C

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Get the number of active records in fixed-length data file.

Short Name



Low-Level fixed-length data file function


LONG NbrOfRecords(COUNT datno)


NbrOfRecords() returns the number of active data records for the fixed length data file designated by datno.

Each time a new record is added to the file, the count of active records is incremented. Each time a record is deleted, the active count is decremented. A record is added by the Low-Level function NewData() or the ISAM function AddRecord(). A record is deleted by the Low-Level function ReleaseData() or the ISAM function DeleteRecord().

Note: A huge file may return values greater than 4 GB. This function returns the low-order 4-byte word of the 8-byte number of keys. To get the high-order 4-byte word, call ctGETHGH(). A return of zero is not necessarily an error if there are exactly a multiple 4 GB worth of key values.


If an error occurs or if there are no active data records, NbrOfRecords() returns a value of zero. Otherwise, NbrOfRecords() returns the number of active fixed data records in the data file. After a call to NbrOfRecords() returns a zero, check the value of uerr_cod: if uerr_cod is non-zero, an error condition was detected; otherwise, no active records are in the file. See c-tree Error Codes in the c-tree Programmer’s Reference Guide for a complete listing of valid c-tree error values.


COUNT datno;


printf("\nThere are %ld active records in file #%d.",


ee also

NewData(), AddRecord(), DeleteRecord(), ReleaseData()