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64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/** \file
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Write a file demonstrating some of the features of netCDF-4.
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This is a simple example which reads a small dummy array, which was
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written by simple_xy_wr.c. This is intended to illustrate the use of
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the netCDF C API.
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Full documentation for netCDF can be found at:
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http://www.unidata.ucar.edu/netcdf/docs
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <netcdf.h>
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/* This is the name of the data file we will read. */
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#define FILE_NAME "simple_xy.nc"
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/* We are reading 2D data, a 6 x 12 grid. */
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#define NX 6
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#define NY 12
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/* Handle errors by printing an error message and exiting with a
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* non-zero status. */
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#define ERRCODE 2
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#define ERR(e) {printf("Error: %s\n", nc_strerror(e)); exit(ERRCODE);}
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int
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main()
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{
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/* This will be the netCDF ID for the file and data variable. */
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int ncid, varid;
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int data_in[NX][NY];
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/* Loop indexes, and error handling. */
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int x, y, retval;
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/* Open the file. NC_NOWRITE tells netCDF we want read-only access
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* to the file.*/
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if ((retval = nc_open(FILE_NAME, NC_NOWRITE, &ncid)))
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ERR(retval);
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/* Get the varid of the data variable, based on its name. */
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if ((retval = nc_inq_varid(ncid, "data", &varid)))
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ERR(retval);
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/* Read the data. */
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if ((retval = nc_get_var_int(ncid, varid, &data_in[0][0])))
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ERR(retval);
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/* Check the data. */
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for (x = 0; x < NX; x++)
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for (y = 0; y < NY; y++)
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if (data_in[x][y] != x * NY + y)
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return ERRCODE;
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/* Close the file, freeing all resources. */
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if ((retval = nc_close(ncid)))
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ERR(retval);
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printf("*** SUCCESS reading example file %s!\n", FILE_NAME);
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return 0;
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}
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