mirror of https://github.com/ecmwf/eccodes.git
130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/*
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* Copyright 2005-2015 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_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_KEY_LEN 255
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#define MAX_VAL_LEN 1024
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void usage(char* prog) {
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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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long longVal;
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int err=0, cnt=0;
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int keyType;
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/* To skip certain keys use the combination of these flags:
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unsigned long key_iterator_filter_flags=
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CODES_KEYS_ITERATOR_SKIP_READ_ONLY ||
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CODES_KEYS_ITERATOR_SKIP_COMPUTED ||
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CODES_KEYS_ITERATOR_SKIP_CODED ||
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CODES_KEYS_ITERATOR_SKIP_EDITION_SPECIFIC ||
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CODES_KEYS_ITERATOR_SKIP_DUPLICATES ||
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CODES_KEYS_ITERATOR_SKIP_FUNCTION; */
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unsigned long key_iterator_filter_flags=CODES_KEYS_ITERATOR_ALL_KEYS;
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/* name_space=NULL to get all the keys. Other namespaces are e.g. "ls" */
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char* name_space=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,"r");
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if (!in) {
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printf("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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{
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codes_keys_iterator* kiter=NULL;
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if (h == NULL) {
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printf("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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/* get key iterator */
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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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/* 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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/* loop over the keys */
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while(codes_keys_iterator_next(kiter))
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{
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/* get key name*/
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const char* name = codes_keys_iterator_get_name(kiter);
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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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/* not array */
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if(klen ==1 || keyType == CODES_TYPE_STRING)
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{
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vlen=MAX_VAL_LEN;
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bzero(value,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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/* for arrays */
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else
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printf("(array of %ld)\n",klen);
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}
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/* delete key iterator */
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codes_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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