mirror of https://github.com/ecmwf/eccodes.git
76 lines
1.8 KiB
C
76 lines
1.8 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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* Description: compare values retrieved with grib_get_double_array and
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* grib_get_double_element
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*
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* Author: Cristian D. Codorean
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*
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*/
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#include "grib_api.h"
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static void usage(const char* prog) {
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printf("usage: %s filename\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,i = 0;
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double *values = NULL;
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size_t values_len= 0;
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double element_value=0;
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FILE* in = NULL;
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char* filename = NULL;
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grib_handle *h = NULL;
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if (argc<2) usage(argv[0]);
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filename=argv[1];
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in = fopen(filename,"rb");
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if(!in) {
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printf("ERROR: unable to open file %s\n",filename);
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return 1;
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}
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/* create new handle from a message in a file*/
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h = grib_handle_new_from_file(0,in,&err);
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if (h == NULL) {
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printf("Error: unable to create handle from file %s\n",filename);
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return 1;
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}
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/* get the size of the values array */
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GRIB_CHECK(grib_get_size(h,"values",&values_len),0);
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values = (double*)malloc(values_len*sizeof(double));
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/* get data values*/
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GRIB_CHECK(grib_get_double_array(h,"values",values,&values_len),0);
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if (values_len < 100) exit(1);
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for (i = 0; i < 100; i++) {
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/* get a particular data value */
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GRIB_CHECK(grib_get_double_element(h, "values", i, &element_value),0);
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if (element_value != values[i]) {
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exit(1);
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}
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}
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free(values);
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grib_handle_delete(h);
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fclose(in);
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return 0;
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}
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