eccodes/examples/C/grib_set_pv.c

85 lines
2.1 KiB
C

/*
* (C) Copyright 2005- ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
*
* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
*/
/*
* C Implementation: grib_set_pv
*
* Description: how to set pv (vertical coordinate parameters)
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "eccodes.h"
int main(int argc, char** argv)
{
int err = 0;
long NV = 0;
size_t size = 0;
double pv[4] = { 1, 2, 3, 4 };
size_t pvsize = 4;
FILE* in = NULL;
char* infile = NULL;
FILE* out = NULL;
char* outfile = NULL;
codes_handle* h = NULL;
const void* buffer = NULL;
if (argc != 3) return 1;
infile = argv[1];
outfile = argv[2];
in = fopen(infile, "rb");
if (!in) {
fprintf(stderr, "ERROR: unable to open input file %s\n", infile);
return 1;
}
out = fopen(outfile, "wb");
if (!out) {
fprintf(stderr, "ERROR: unable to open output file %s\n", outfile);
fclose(in);
return 1;
}
/* create a new handle from a message in a file */
h = codes_handle_new_from_file(0, in, PRODUCT_GRIB, &err);
if (h == NULL) {
fprintf(stderr, "Error: unable to create handle from file %s\n", infile);
fclose(out);
return 1;
}
CODES_CHECK(codes_set_long(h, "PVPresent", 1), 0);
CODES_CHECK(codes_set_double_array(h, "pv", pv, pvsize), 0);
/* once we set the pv array, the NV key should be also set */
CODES_CHECK(codes_get_long(h, "NV", &NV), 0);
assert(NV == pvsize);
/* get the coded message in a buffer */
CODES_CHECK(codes_get_message(h, &buffer, &size), 0);
/* write the buffer in a file*/
if (fwrite(buffer, 1, size, out) != size) {
perror(outfile);
exit(1);
}
codes_handle_delete(h);
fclose(in);
fclose(out);
return 0;
}