Page History

# (C) Copyright 2005- ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
#
# In applying this licence, ECMWF does not waive the privileges and immunities
# granted to it by virtue of its status as an intergovernmental organisation
# nor does it submit to any jurisdiction.

#
# Python implementation: bufr_get_keys
#
# Description: how to read values of different type of keys from BUFR messages.
#
#

import sys
import traceback

from eccodes import *

INPUT = '../../data/bufr/syno_multi.bufr'
VERBOSE = 1  # verbose error reporting


def example():
    # open bufr file
    f = open(INPUT, 'rb')

    cnt = 0

    # loop for the messages in the file
    while 1:
        # get handle for message
        bufr = codes_bufr_new_from_file(f)
        if bufr is None:
            break

        print("message: %s" % cnt)

        # we need to instruct ecCodes to expand all the descriptors
        # i.e. unpack the data values
        codes_set(bufr, 'unpack', 1)

        # ---------------------------------------------
        # get values for keys holding a single value
        # ---------------------------------------------
        # Native type integer
        key = 'blockNumber'

        try:
            print('  %s: %s' % (key, codes_get(bufr, key)))
        except CodesInternalError as err:
            print('Error with key="%s" : %s' % (key, err.msg))

        # Native type integer
        key = 'stationNumber'
        try:
            print('  %s: %s' % (key, codes_get(bufr, key)))
        except CodesInternalError as err:
            print('Error with key="%s" : %s' % (key, err.msg))

        # Native type float
        key = 'airTemperatureAt2M'
        try:
            print('  %s: %s' % (key, codes_get(bufr, key)))
        except CodesInternalError as err:
            print('Error with key="%s" : %s' % (key, err.msg))

        # Native type string
        key = 'typicalDate'
        try:
            print('  %s: %s' % (key, codes_get(bufr, key)))
        except CodesInternalError as err:
            print('Error with key="%s" : %s' % (key, err.msg))

        # --------------------------------
        # get values for an array
        # --------------------------------
        # Native type integer
        key = 'bufrdcExpandedDescriptors'

        # get size
        num = codes_get_size(bufr, key)
        print('  size of %s is: %s' % (key, num))

        # get values
        values = codes_get_array(bufr, key)
        for i in range(len(values)):
            CODES_CHECK(codes_get_long_array(h,"bufrdcExpandedDescriptors",descriptors,&desc_len),0);print("   %d %06d" % (i + 1, values[i]))

        printf("  bufrdcExpandedDescriptors:\n");# Native type float
        for(ikey = 0; i < desc_len; i++) 'numericValues'

        # get size
        {
num = codes_get_size(bufr, key)
         printfprint("'   %ld\n",descriptors[i]);
        }
size of %s is: %s' % (key, num))

        # get values
        /* ---- array of double ---------------*/values = codes_get_array(bufr, key)
        
for i in range(len(values)):
      /* get the size and allocate memory*/
 print("   %d %.10e" % (i  CODES_CHECK(codes_get_size(h,"numericValues",&values_len),0);+ 1, values[i]))

        valuescnt += malloc(values_len*sizeof(double));
      1

        /*# get the values*/delete handle
        CODES_CHECK(codes_get_double_array(h,"numericValues",values,&values_len),0);
        printf("  numericValues:\n");
        for(i = 0; i < values_len; i++)release(bufr)

    # close the file
    f.close()


def main():
    try:
        {example()
    except CodesInternalError as err:
     printf("   %.10e\n",values[i]);if VERBOSE:
        }

    traceback.print_exc(file=sys.stderr)
        else:
  /* ---- string value  -----------------*/
     sys.stderr.write(err.msg   + '\n')

        /* get the size and allocate memory*/
        CODES_CHECK(codes_get_length(h, "typicalDate", &len), 0);
        typicalDate = (char*)malloc(len*sizeof(char));
        
        /* get the values*/
        grib_get_string(h, "typicalDate", typicalDate, &len);
        printf("  typicalDate: %s\n", typicalDate);
        
        /* free allocated arrays */
        free(descriptors);
        free(values);
        free(typicalDate);
    
        /* delete handle */
        codes_handle_delete(h);
        
        cnt++;
    }
    
    fclose(in);
    return 0;
}
return 1


if __name__ == "__main__":
    sys.exit(main())

/*
 * (C) Copyright 2005- ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
 * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
 */

/*
 * C Implementation: bufr_get_keys
 *
 * Description: how to read values of different type of keys from BUFR messages.
 *
 */

#include "eccodes.h"

int main(int argc,char* argv[])
{
    FILE* in = NULL;

    /* message handle. Required in all the eccodes calls acting on a message.*/
    codes_handle* h=NULL;

    long *descriptors=NULL;
    double *values = NULL;
    char* typicalDate= NULL;
    long longVal;
    double doubleVal;
    size_t values_len=0, desc_len=0, len=0;
    int i, err=0;
    int cnt=0;
    const char* infile = "../../data/bufr/syno_multi.bufr";

    in=fopen(infile,"rb");
    if (!in) {
        printf("ERROR: unable to open file %s\n", infile);
        return 1;
    }

    /* loop over the messages in the bufr file */
    while ((h = codes_handle_new_from_file(NULL, in, PRODUCT_BUFR, &err)) != NULL || err != CODES_SUCCESS)
    {
        if (h == NULL) {