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# (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_subset
#
# Description: how to read data values from a given subset of a BUFR message.
#
#
import sys
import traceback
from eccodes import *
INPUT = "../../data/bufr/synop_multi_subset.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)
# find out the number of subsets
key = "numberOfSubsets"
numberOfSubsets = codes_get(bufr, "numberOfSubsets")
print(" %s: %d" % (key, numberOfSubsets))
# loop over the subsets
for i in range(1, numberOfSubsets + 1):
# read and print some data values
key = "/subsetNumber=%d/blockNumber" % i
print(key)
val = codes_get_long(bufr, key)
print(" %s= %d" % (key, val))
key = "/subsetNumber=%d/stationNumber" % i
val = codes_get_long(bufr, key)
print(" %s: %d" % (key, val))
cnt += 1
# delete handle
codes_release(bufr)
# close the file
f.close()
def main():
try:
example()
except CodesInternalError as err:
if VERBOSE:
traceback.print_exc(file=sys.stderr)
else:
sys.stderr.write(err.msg + "\n")
return 1
if __name__ == "__main__":
sys.exit(main())
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