mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-12-21 08:39:46 +08:00
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* This example program is part of Unidata's netCDF library for
|
|
scientific data access.
|
|
|
|
This example shows how to create and deal with files of different
|
|
netcdf formats (i.e. classic vs. 64-bit-offset).
|
|
|
|
Ed Hartnett, 7/13/4
|
|
$Id: format.c,v 1.1 2004/07/26 14:04:42 ed Exp $
|
|
*/
|
|
|
|
#include <netcdf.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
/* This macro handles errors by outputting a message to stdout and
|
|
then exiting. */
|
|
#define NC_EXAMPLE_ERROR 2 /* This is the exit code for failure. */
|
|
#define BAIL(e) do { \
|
|
printf("Bailing out in file %s, line %d, error:%s.\n", \
|
|
__FILE__, __LINE__, nc_strerror(e)); \
|
|
return NC_EXAMPLE_ERROR; \
|
|
} while (0)
|
|
|
|
#define NUMDIMS 2
|
|
#define NUMVARS 1
|
|
#define LAT_LEN 3
|
|
#define LON_LEN 2
|
|
|
|
int
|
|
main()
|
|
{
|
|
int ncid, temp_varid, dimids[NUMDIMS];
|
|
float temp[LAT_LEN][LON_LEN], *fp;
|
|
char classic_file[] = "classic.nc", offset64_file[] = "offset.nc";
|
|
char *file = classic_file;
|
|
int i, res;
|
|
|
|
/* Create a bunch of phoney data so we have something to write in
|
|
the example file. */
|
|
for (fp=(float *)temp, i=0; i<LAT_LEN*LON_LEN; i++)
|
|
*fp++ = 10. + i/10.;
|
|
|
|
/* Now create the file in both formats with the same code. */
|
|
for (i=0; i<2; i++)
|
|
{
|
|
if (i==1) /* 64-bit offset format file */
|
|
{
|
|
file = offset64_file;
|
|
if ((res = nc_set_default_format(NC_FORMAT_64BIT, NULL)))
|
|
BAIL(res);
|
|
}
|
|
|
|
/* Create the netCDF file. */
|
|
if ((res = nc_create(file, NC_CLOBBER, &ncid)))
|
|
BAIL(res);
|
|
|
|
/* Define dimensions. */
|
|
if ((res = nc_def_dim(ncid, "latitude", LAT_LEN, dimids)))
|
|
BAIL(res);
|
|
if ((res = nc_def_dim(ncid, "longitude", LON_LEN, &dimids[1])))
|
|
BAIL(res);
|
|
|
|
/* Define the variable. */
|
|
if ((res = nc_def_var(ncid, "sfc_temp", NC_FLOAT, NUMDIMS,
|
|
dimids, &temp_varid)))
|
|
BAIL(res);
|
|
|
|
/* We're finished defining metadata. */
|
|
if ((res = nc_enddef(ncid)))
|
|
BAIL(res);
|
|
|
|
if ((res = nc_put_var_float(ncid, temp_varid, (float *)temp)))
|
|
BAIL(res);
|
|
|
|
/* We're done! */
|
|
if ((res = nc_close(ncid)))
|
|
BAIL(res);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|