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simple_xy_nc4_rd.c
Go to the documentation of this file.
/* Copyright 2019 University Corporation for Atmospheric
Research/Unidata. See COPYRIGHT file for conditions of use. */
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <netcdf.h>
/* This is the name of the data file we will read. */
#define FILE_NAME "simple_xy_nc4.nc"
/* We are reading 2D data, a 6 x 12 grid. */
#define NX 6
#define NY 12
/* Handle errors by printing an error message and exiting with a
* non-zero status. */
#define ERRCODE 2
#define ERR(e) {printf("Error: %s\n", nc_strerror(e)); exit(ERRCODE);}
int
main()
{
/* This will be the netCDF ID for the file and data variable. */
int ncid, varid;
int data_in[NX][NY];
/* Loop indexes, and error handling. */
int x, y, retval;
/* Open the file. NC_NOWRITE tells netCDF we want read-only access
* to the file.*/
if ((retval = nc_open(FILE_NAME, NC_NOWRITE, &ncid)))
ERR(retval);
/* Get the varid of the data variable, based on its name. */
if ((retval = nc_inq_varid(ncid, "data", &varid)))
ERR(retval);
/* Read the data. */
if ((retval = nc_get_var_int(ncid, varid, &data_in[0][0])))
ERR(retval);
/* Check the data. */
for (x = 0; x < NX; x++)
for (y = 0; y < NY; y++)
if (data_in[x][y] != x * NY + y)
return ERRCODE;
/* Close the file, freeing all resources. */
if ((retval = nc_close(ncid)))
ERR(retval);
printf("*** SUCCESS reading example file %s!\n", FILE_NAME);
return 0;
}
nc_close
EXTERNL int nc_close(int ncid)
Close an open netCDF dataset.
Definition dfile.c:1330
nc_open
EXTERNL int nc_open(const char *path, int mode, int *ncidp)
Open an existing netCDF file.
Definition dfile.c:694
nc_inq_varid
EXTERNL int nc_inq_varid(int ncid, const char *name, int *varidp)
Find the ID of a variable, from the name.
Definition dvarinq.c:60
netcdf.h
Main header file for the C API.
NC_NOWRITE
#define NC_NOWRITE
Set read-only access for nc_open().
Definition netcdf.h:135