mirror of https://github.com/ecmwf/eccodes.git
117 lines
3.2 KiB
C
117 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_keys_iterator
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*
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* Description: how to use keys_iterator functions and the
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* codes_bufr_keys_iterator structure to get all the available
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* keys in a BUFR message.
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*
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*/
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#include "eccodes.h"
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#define MAX_VAL_LEN 1024
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static void usage(const char* prog)
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{
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printf("usage: %s infile\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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char* filename = NULL;
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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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int err = 0, cnt = 0;
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int keyType = 0;
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int subsetNumber = 0;
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char value[MAX_VAL_LEN];
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size_t vlen = MAX_VAL_LEN;
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size_t klen = 0;
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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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fprintf(stderr, "Error: unable to open file %s\n", filename);
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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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codes_bufr_keys_iterator* kiter = NULL;
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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 unpack the data values */
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CODES_CHECK(codes_set_long(h, "unpack", 1), 0);
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/* get BUFR key iterator */
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kiter = codes_bufr_keys_iterator_new(h, 0);
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if (!kiter) {
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fprintf(stderr, "Error: Unable to create BUFR keys iterator\n");
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exit(1);
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}
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/* loop over the keys */
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while (codes_bufr_keys_iterator_next(kiter)) {
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/* get key name */
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char* name = codes_bufr_keys_iterator_get_name(kiter);
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if (strcmp(name, "subsetNumber") == 0) {
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subsetNumber++;
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printf("\n Subset %d:\n", subsetNumber);
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continue;
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}
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printf(" %s=", name);
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CODES_CHECK(codes_get_native_type(h, name, &keyType), 0);
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/* get key size to see if it is an array */
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CODES_CHECK(codes_get_size(h, name, &klen), 0);
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if (klen == 1) {
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/* not array */
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vlen = MAX_VAL_LEN;
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memset(value, 0, vlen);
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codes_get_string(h, name, value, &vlen);
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printf("%s\n", value);
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}
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else {
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/* for arrays */
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printf("(array of %zu)\n", klen);
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}
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}
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/* delete key iterator */
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codes_bufr_keys_iterator_delete(kiter);
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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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