mirror of https://github.com/ecmwf/eccodes.git
99 lines
3.2 KiB
C
99 lines
3.2 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: bufr_subset
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*
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* Description: how to read data values from a given subset of a BUFR message.
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*
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*/
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#include "eccodes.h"
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#include <assert.h>
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int main(int argc, char* argv[])
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{
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char key[200] = {0,};
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FILE* in = NULL;
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/* message handle. Required in all the eccodes calls acting on a message.*/
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codes_handle* h = NULL;
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long numberOfSubsets = 0;
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long longVal;
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double doubleVal;
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size_t stringLen;
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char stringVal[100] = {0,};
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int i, err = 0;
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int cnt = 0;
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const char* infile = "../../data/bufr/synop_multi_subset.bufr";
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in = fopen(infile, "rb");
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if (!in) {
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fprintf(stderr, "Error: unable to open file %s\n", infile);
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return 1;
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}
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/* loop over the messages in the BUFR file */
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while ((h = codes_handle_new_from_file(NULL, in, PRODUCT_BUFR, &err)) != NULL || err != CODES_SUCCESS) {
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if (h == NULL) {
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fprintf(stderr, "Error: unable to create handle for message %d\n", cnt);
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cnt++;
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continue;
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}
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printf("message: %d\n", cnt);
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/* we need to instruct ecCodes to expand all the descriptors i.e. unpack the data values */
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CODES_CHECK(codes_set_long(h, "unpack", 1), 0);
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/* find out the number of subsets */
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CODES_CHECK(codes_get_long(h, "numberOfSubsets", &numberOfSubsets), 0);
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printf(" numberOfSubsets: %ld\n", numberOfSubsets);
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/* loop over the subsets */
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for (i = 1; i <= numberOfSubsets; i++) {
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sprintf(key, "/subsetNumber=%d/blockNumber", i);
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printf(" subsetNumber=%d", i);
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/* read and print some data values */
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CODES_CHECK(codes_get_long(h, key, &longVal), 0);
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printf(" blockNumber=%ld", longVal);
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sprintf(key, "/subsetNumber=%d/stationNumber", i);
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CODES_CHECK(codes_get_long(h, key, &longVal), 0);
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printf(" stationNumber=%ld", longVal);
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sprintf(key, "/subsetNumber=%d/stationOrSiteName->units", i);
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CODES_CHECK(codes_get_length(h, key, &stringLen), 0);
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assert(stringLen == 10); /* should be "CCITT IA5" */
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sprintf(key, "/subsetNumber=%d/stationOrSiteName", i);
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CODES_CHECK(codes_get_length(h, key, &stringLen), 0);
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CODES_CHECK(codes_get_string(h, key, stringVal, &stringLen), 0);
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assert(stringLen > 0 && stringLen < 17);
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printf(" stationOrSiteName=\"%s\"", stringVal);
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sprintf(key, "/subsetNumber=%d/airTemperature", i);
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CODES_CHECK(codes_get_double(h, key, &doubleVal), 0);
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printf(" airTemperature=%g\n", doubleVal);
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assert(doubleVal > 265 && doubleVal < 278);
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}
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/* delete handle */
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codes_handle_delete(h);
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cnt++;
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}
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fclose(in);
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return 0;
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}
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