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