Description
This example shows: how to set different type of keys in BUFR messages.Source code
bufr_set_keys.c
/*
* Copyright 2005-2015 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_set_keys
*
* Description: how to set different type of keys in BUFR messages.
*
*/
#include "eccodes.h"
void usage(char* prog) {
printf("usage: %s infile\n",prog);
exit(1);
}
int main(int argc,char* argv[])
{
FILE* in = NULL;
FILE* out = NULL;
/* message handle. Required in all the eccodes calls acting on a message.*/
codes_handle* h=NULL;
long longVal;
/*double doubleVal;*/
int i, err=0;
int cnt=0;
size_t size = 0;
char* infile = "../../data/bufr/syno_multi.bufr";
const void *buffer = NULL;
if (argc != 2) {
usage(argv[0]);
return 1;
}
in = fopen(infile,"r");
out = fopen(argv[1],"w");
if (!in || !out) {
perror("ERROR: unable to open files");
if (out) fclose(out);
if (in) fclose(in);
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) {
printf("Error: unable to create handle for message %d\n",cnt);
cnt++;
continue;
}
printf("message: %d\n",cnt);
/* we need to instruct ecCodes to expand the descriptors
i.e. unpack the data values */
/*CODES_CHECK(codes_set_long(h,"unpack",1),0);*/
/* This is the place where you may wish to modify the message*/
/*E.g. we change the centre */
/* set bufrHeaderCentre */
longVal=222;
CODES_CHECK(codes_set_long(h, "bufrHeaderCentre", longVal),0);
printf(" set bufrHeaderCentre to: %ld\n",longVal);
/* check bufrHeaderCentre */
CODES_CHECK(codes_get_long(h,"bufrHeaderCentre",&longVal),0);
printf(" bufrHeaderCentre's new value is: %ld\n",longVal);
/* get the modified message in a buffer */
CODES_CHECK(codes_get_message(h,&buffer,&size),0);
/* write the buffer to a file */
if(fwrite(buffer,1,size,out) != size) {
perror(argv[0]);
return 1;
}
/* delete handle */
codes_handle_delete(h);
cnt++;
}
fclose(in);
return 0;
}
bufr_set_keys.f90
! Copyright 2005-2015 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.
!
! FORTRAN 90 implementation: bufr_set_keys
!
! Description: how to set different type of keys in BUFR messages.
!
!
program bufr_set_keys
use eccodes
implicit none
integer :: err,i,iret
integer :: infile,outfile
integer :: ibufr
integer :: count=0
integer(kind=4) :: centre, centreNew
double precision, dimension(:,:), allocatable :: field2D
! open input file
call codes_open_file(infile,'../../data/bufr/syno_multi.bufr','r')
! open output file
call codes_open_file(outfile,'bufr_set_keys_test_f.tmp.bufr','w')
! the first bufr message is loaded from file
! ibufr is the bufr id to be used in subsequent calls
call codes_bufr_new_from_file(infile,ibufr,iret)
do while (iret/=CODES_END_OF_FILE)
write(*,*) 'message: ',count
! This is the place where you may wish to modify the message
! E.g. we change the centre
! set centre
centre=222
call codes_set(ibufr,'bufrHeaderCentre',222)
write(*,*) ' set bufrHeaderCentre to:',centre
! check centre's new value
centreNew=0
call codes_get(ibufr,'bufrHeaderCentre',centreNew)
write(*,*) ' bufrHeaderCentre''s new value:',centreNew
! write modified message to a file
call codes_write(ibufr,outfile)
! relase the handle
call codes_release(ibufr)
! next message from source
call codes_bufr_new_from_file(infile,ibufr,iret)
count=count+1
end do
call codes_close_file(infile)
call codes_close_file(outfile)
end program bufr_set_keys
bufr_set_keys.py
# Copyright 2005-2015 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_set_keys
#
# Description: how to set different type of keys in BUFR messages.
#
#
import traceback
import sys
from eccodes import *
INPUT='../../data/bufr/syno_multi.bufr'
OUTPUT='bufr_set_keys_test_p.tmp.bufr'
VERBOSE=1 # verbose error reporting
def example():
# open bufr file
fin = open(INPUT)
# open otput bufr file
fout = open(OUTPUT,'w')
cnt=0
# loop for the messages in the file
while 1:
# get handle for message
gid = codes_bufr_new_from_file(fin)
if gid 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(gid,'unpack',1);
# This is the place where you may wish to modify the message
# E.g. we change the centre
# set centre
val=222
print ' set bufrHeaderCentre to: %d' % val
key='bufrHeaderCentre'
if not codes_is_defined(gid,key):
raise Exception("Key: " + key + " was not defined")
codes_set(gid,key,val)
#check bufrHeaderCentre's value
print ' %s''s new value is: %d' % (key,codes_get(gid,key))
# write modified message to output
codes_write(gid,fout)
cnt+=1
# delete handle
codes_release(gid)
fin.close()
fout.close()
def main():
try:
example()
except CodesInternalError,err:
if VERBOSE:
traceback.print_exc(file=sys.stderr)
else:
print >>sys.stderr,err.msg
return 1
if __name__ == "__main__":
sys.exit(main())