mirror of https://github.com/ecmwf/eccodes.git
90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/*
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* Copyright 2005-2018 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,"r");
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if(!in) {
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printf("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,"w");
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if(!out) {
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printf("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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printf("Error: unable to create handle from file %s\n",infile);
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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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{
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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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