mirror of https://github.com/ecmwf/eccodes.git
91 lines
2.6 KiB
C
91 lines
2.6 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_keys
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*
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* Description: how to set key values in GRIB messages
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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 "eccodes.h"
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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 centre = 80;
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long long_value = 0;
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char string_value[100];
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size_t len = sizeof(string_value) / sizeof(char);
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size_t size = 0;
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FILE* in = NULL;
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const char* infile = "../../data/regular_latlon_surface.grib1";
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FILE* out = NULL;
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const char* outfile = "out.set.grib1";
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codes_handle* h = NULL;
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const void* buffer = NULL;
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size_t str_len = 0; /* See the call to codes_set_string later */
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in = fopen(infile, "rb");
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if (!in) {
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fprintf(stderr, "Error: unable to open 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 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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/* set centre as a long */
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CODES_CHECK(codes_set_long(h, "centre", centre), 0);
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/* set paramId and shortName - normally you would do one or the other */
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CODES_CHECK(codes_set_long(h, "paramId", 500004), 0);
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/* the value of str_len is not used, it can be anything! */
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CODES_CHECK(codes_set_string(h, "shortName", "fis", &str_len), 0);
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/* get centre as a long */
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CODES_CHECK(codes_get_long(h, "centre", &long_value), 0);
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printf("centre long value=%ld\n", long_value);
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/* get centre as a string */
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CODES_CHECK(codes_get_string(h, "centre", string_value, &len), 0);
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printf("centre string value=%s\n", string_value);
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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(outfile);
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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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