NAME¶
gd_nvectors — report the number of vector fields in a dirfile
SYNOPSIS¶
#include <getdata.h>
unsigned int gd_nvectors(DIRFILE
*dirfile);
DESCRIPTION¶
The
gd_nvectors() function queries a
dirfile(5) database specified by
dirfile and returns the number of vector fields defined in the database
(
i.e. fields of types
BIT,
LINCOM,
LINTERP,
MULTIPLY,
PHASE,
POLYNOM,
RAW,
SBIT). Notably, this count does not include /META fields.
The
dirfile argument must point to a valid DIRFILE object previously
created by a call to
gd_open(3).
RETURN VALUE¶
Upon successful completion,
gd_nvectors() returns the number of vector
fields in the dirfile. On error, it returns zero and sets the dirfile error to
a non-zero error value. Possible error values are:
- GD_E_BAD_DIRFILE
- The supplied dirfile was invalid.
The dirfile error may be retrieved by calling
gd_error(3). A descriptive
error string for the last error encountered can be obtained from a call to
gd_error_string(3).
SEE ALSO¶
dirfile(5),
gd_open(3),
gd_error(3),
gd_error_string(3),
gd_nfields(3),
gd_nmvectors(3),
gd_vector_list(3)
