mirror of https://github.com/ecmwf/eccodes.git
80 lines
2.5 KiB
C
80 lines
2.5 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_multi
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*
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* Description: How to decode GRIB2 multi-field messages.
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* Try to turn the multi support on and off to
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* see the difference. Default is OFF.
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* For all the tools default is multi support ON.
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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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long parameterCategory = 0, parameterNumber = 0, discipline = 0;
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FILE* in = NULL;
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const char* filename = "../../data/multi.grib2";
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codes_handle* h = NULL;
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int mcount = 0;
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/* turn on support for GRIB2 multi-field messages */
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codes_grib_multi_support_on(NULL);
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/* turn off support for GRIB2 multi-field messages */
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/* codes_multi_support_off(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 file %s\n", filename);
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return 1;
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}
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CODES_CHECK(grib_count_in_file(NULL, in, &mcount), 0);
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assert(mcount == 56);
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printf("grib_count_in_file counted %d messages\n", mcount);
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mcount = 0;
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CODES_CHECK(grib_count_in_filename(NULL, filename, &mcount), 0);
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assert(mcount == 56);
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printf("grib_count_in_filename counted %d messages\n", mcount);
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mcount = 0;
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while ((h = codes_handle_new_from_file(0, in, PRODUCT_GRIB, &err)) != NULL) {
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CODES_CHECK(err, 0);
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++mcount;
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CODES_CHECK(codes_get_long(h, "discipline", &discipline), 0);
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printf("discipline=%ld\n", discipline);
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CODES_CHECK(codes_get_long(h, "parameterCategory", ¶meterCategory), 0);
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printf("parameterCategory=%ld\n", parameterCategory);
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CODES_CHECK(codes_get_long(h, "parameterNumber", ¶meterNumber), 0);
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printf("parameterNumber=%ld\n", parameterNumber);
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if (discipline == 0 && parameterCategory == 2) {
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if (parameterNumber == 2) printf("-------- u -------\n");
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if (parameterNumber == 3) printf("-------- v -------\n");
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}
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codes_handle_delete(h);
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}
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assert(mcount == 56);
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printf("codes_handle_new_from_file counted %d messages\n", mcount);
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fclose(in);
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return 0;
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}
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