mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-11-21 03:13:42 +08:00
69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/* Copyright 2019 University Corporation for Atmospheric
|
|
Research/Unidata. See COPYRIGHT file for conditions of use. */
|
|
/**
|
|
* @file
|
|
* Write a file demonstrating some of the features of netCDF-4.
|
|
*
|
|
* This is a simple example which reads a small dummy array, which was
|
|
* written by simple_xy_wr.c. This is intended to illustrate the use
|
|
* of the netCDF C API.
|
|
*
|
|
* Full documentation for netCDF can be found at:
|
|
* http://www.unidata.ucar.edu/netcdf/docs.
|
|
*
|
|
* @author Ed Hartnett
|
|
*/
|
|
#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.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;
|
|
}
|