mirror of https://github.com/ecmwf/eccodes.git
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*
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* Copyright 2005-2019 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_keys_iterator
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*
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* Description:
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* Example on how to use keys_iterator functions and the
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* codes_keys_iterator structure to get all the available
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* keys in a GRIB message.
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*
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#if !(defined(_WIN32) && defined(_MSC_VER))
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#include <unistd.h>
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#endif
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#include "eccodes.h"
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#define MAX_VAL_LEN 1024
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static void usage(char* progname);
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int main(int argc, char *argv[])
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{
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/* To skip read only and computed keys
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unsigned long key_iterator_filter_flags=CODES_KEYS_ITERATOR_SKIP_READ_ONLY |
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CODES_KEYS_ITERATOR_SKIP_COMPUTED;
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*/
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unsigned long key_iterator_filter_flags = CODES_KEYS_ITERATOR_ALL_KEYS |
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CODES_KEYS_ITERATOR_SKIP_DUPLICATES;
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/* Choose a namespace. E.g. "ls", "time", "parameter", "geography", "statistics" */
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const char* name_space="ls";
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/* name_space=NULL to get all the keys */
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/* char* name_space=0; */
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FILE* f = NULL;
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codes_handle* h=NULL;
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int err=0;
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int msg_count=0;
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char value[MAX_VAL_LEN];
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size_t vlen=MAX_VAL_LEN;
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if (argc != 2) usage(argv[0]);
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f = fopen(argv[1],"rb");
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if(!f) {
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perror(argv[1]);
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exit(1);
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}
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while((h = codes_handle_new_from_file(0,f,PRODUCT_GRIB,&err)) != NULL)
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{
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codes_keys_iterator* kiter=NULL;
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msg_count++;
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printf("-- GRIB N. %d --\n",msg_count);
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if(!h) {
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printf("ERROR: Unable to create grib handle\n");
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exit(1);
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}
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kiter=codes_keys_iterator_new(h,key_iterator_filter_flags,name_space);
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if (!kiter) {
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printf("ERROR: Unable to create keys iterator\n");
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exit(1);
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}
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while(codes_keys_iterator_next(kiter))
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{
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const char* name = codes_keys_iterator_get_name(kiter);
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vlen=MAX_VAL_LEN;
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memset(value, 0, vlen);
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CODES_CHECK(codes_get_string(h,name,value,&vlen),name);
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printf("%s = %s\n",name,value);
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/* Alternative way of getting the string value */
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CODES_CHECK(codes_keys_iterator_get_string(kiter, value, &vlen),0);
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}
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codes_keys_iterator_delete(kiter);
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codes_handle_delete(h);
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}
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fclose(f);
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return 0;
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}
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static void usage(char* progname)
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{
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printf("\nUsage: %s grib_file\n",progname);
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exit(1);
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}
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