mirror of https://github.com/ecmwf/eccodes.git
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
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/*
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* Copyright 2005-2012 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: get
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*
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* Description: how to get values using keys.
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*
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*
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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 "grib_api.h"
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int main(int argc, char** argv) {
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int err = 0;
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size_t i = 0;
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size_t count;
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size_t size;
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long numberOfContributingSpectralBands;
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long values[1024];
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FILE* in = NULL;
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char* filename = "../../data/satellite.grib";
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grib_handle *h = NULL;
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in = fopen(filename,"r");
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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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}
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numberOfContributingSpectralBands = 2;
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GRIB_CHECK(grib_set_long(h,"numberOfContributingSpectralBands",numberOfContributingSpectralBands),0);
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numberOfContributingSpectralBands = 9;
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GRIB_CHECK(grib_set_long(h,"numberOfContributingSpectralBands",numberOfContributingSpectralBands),0);
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/* get as a long*/
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GRIB_CHECK(grib_get_long(h,"numberOfContributingSpectralBands",&numberOfContributingSpectralBands),0);
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printf("numberOfContributingSpectralBands=%ld\n",numberOfContributingSpectralBands);
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/* get as a long*/
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GRIB_CHECK(grib_get_size(h,"scaledValueOfCentralWaveNumber",&count),0);
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printf("count=%ld\n",(long)count);
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assert(count < sizeof(values)/sizeof(values[0]));
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size = count;
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GRIB_CHECK(grib_get_long_array(h,"scaledValueOfCentralWaveNumber",values,&size),0);
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assert(size == count);
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for(i=0;i<count;i++)
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printf("scaledValueOfCentralWaveNumber %lu = %ld\n",(unsigned long)i,values[i]);
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for(i=0;i<count;i++)
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values[i] = -values[i];
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size = count;
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/* size--; */
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GRIB_CHECK(grib_set_long_array(h,"scaledValueOfCentralWaveNumber",values,size),0);
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assert(size == count);
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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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