eccodes/examples/C/values_check.c

/*
 * Copyright 2005-2019 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.
 */
#include "eccodes.h"

int main(int argc, char* argv[])
{
    FILE* f;
    int err          = 0;
    char infile[]    = "../../data/reduced_gaussian_model_level.grib1";
    codes_handle* h  = NULL;
    codes_context* c = codes_context_get_default();
    codes_values values[2];
    int nvalues = 2;
    int i;
    char* name = NULL;

    f = fopen(infile, "rb");
    if (!f) {
        perror(infile);
        exit(1);
    }

    h = codes_handle_new_from_file(c, f, PRODUCT_GRIB, &err);
    if (!h) {
        printf("unable to create handle from file %s\n", infile);
        exit(err);
    }
    fclose(f);

    values[0].type       = CODES_TYPE_LONG;
    values[0].name       = "centre";
    values[0].long_value = 98;

    values[1].type       = CODES_TYPE_LONG;
    values[1].name       = "level";
    values[1].long_value = 2;

    /*CODES_VALUE_DIFFERENT -> value is different*/
    err = codes_values_check(h, values, nvalues);
    if (err) {
        for (i = 0; i < nvalues; i++) {
            if (values[i].error == err) name = (char*)values[i].name;
        }
        printf("ERROR: \"%s\" %s\n", name, codes_get_error_message(err));
    }

    values[1].name = "levelll";
    err            = codes_values_check(h, values, nvalues);
    if (err) {
        for (i = 0; i < nvalues; i++) {
            if (values[i].error == err) name = (char*)values[i].name;
        }
        printf("ERROR: \"%s\" %s\n", name, codes_get_error_message(err));
    }

    return 0;
}