mirror of https://github.com/ecmwf/eccodes.git
102 lines
3.1 KiB
C
102 lines
3.1 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_list
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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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#include <stdio.h>
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#include <assert.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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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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long new_values[1024];
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FILE* in = NULL;
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const char* filename = "../../data/satellite.grib";
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codes_handle* h = NULL;
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in = fopen(filename, "rb");
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if (!in) {
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fprintf(stderr, "Error: unable to open input 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 = 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", filename);
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}
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CODES_CHECK(codes_get_long(h, "numberOfContributingSpectralBands", &numberOfContributingSpectralBands), 0);
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assert(numberOfContributingSpectralBands == 3);
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/* Shrink NB to 2 */
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numberOfContributingSpectralBands = 2;
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CODES_CHECK(codes_set_long(h, "numberOfContributingSpectralBands", numberOfContributingSpectralBands), 0);
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/* Expand NB to 9 */
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numberOfContributingSpectralBands = 9;
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CODES_CHECK(codes_set_long(h, "numberOfContributingSpectralBands", numberOfContributingSpectralBands), 0);
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/* get as a long*/
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CODES_CHECK(codes_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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CODES_CHECK(codes_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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CODES_CHECK(codes_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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if (i == 0) assert(values[i] == 26870);
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if (i == 1) assert(values[i] == 9272);
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}
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for (i = 0; i < count; i++)
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values[i] = i + 1000;
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size = count;
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/* size--; */
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CODES_CHECK(codes_set_long_array(h, "scaledValueOfCentralWaveNumber", values, size), 0);
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assert(size == count);
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/* check what we set */
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CODES_CHECK(codes_get_long_array(h, "scaledValueOfCentralWaveNumber", new_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("Now scaledValueOfCentralWaveNumber %lu = %ld\n", (unsigned long)i, new_values[i]);
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assert(new_values[i] == (i + 1000));
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}
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codes_handle_delete(h);
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fclose(in);
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return 0;
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}
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