FairCom ISAM for C

GetGTVRecord

Read the variable-length record with key greater than target.

Short Name

GTVREC()

Type

ISAM function

Declaration

COUNT GetGTVRecord(FILNO keyno, pVOID target, pVOID recptr, pVRLEN plen)

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

GetGTVRecord() is the same as its fixed-length counterpart, GetGTRecord(), except one new argument has been added: plen.

plen acts as both an input and output parameter:

On input, plen contains the length of the output buffer.
On output, the contents of plen is the actual data-record length. If the length of the output buffer is less than the actual record length, a partial read is performed. If an error occurs, plen is unspecified.

Read the function description for GetGTRecord() for additional important information.

Return

Value	Symbolic Constant	Explanation
0	NO_ERROR	Successful retrieval of current ISAM record.
633	NPLN_ERR	recptr is NULL. No data file read performed.
634	NLEN_ERR	Could not lock data record. No data file read performed.

See FairCom DB Error Codes for a complete listing of valid FairCom DB error values.