Description
This example shows: how to create new BUFR messages by cloning an existing message.Source code
bufr_clone.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_clone
*
* Description: how to create new BUFR messages by cloning
* an existing message.
*
*/
#include <stdio.h>
#include "eccodes.h"
void usage(char *app)
{
fprintf(stderr,"Usage is: %s input_file ouput_file\n", app);
}
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 *source_handle = NULL;
const void *buffer = NULL;
size_t size = 0;
int i, err = 0;
if (argc != 3) {
usage(argv[0]);
return 1;
}
in = fopen(argv[1],"r");
out = fopen(argv[2],"w");
/* open input and output */
if (!in || !out) {
perror("ERROR: unable to open files");
fclose(out);
fclose(in);
return 1;
}
/* create a handle for the first message */
source_handle = codes_handle_new_from_file(NULL,in,PRODUCT_BUFR,&err);
if (source_handle == NULL) {
perror("ERROR: could not create handle for message");
fclose(out);
fclose(in);
return 1;
}
/* create several clones of this message and alter them
in different ways */
for(i=0; i < 3; i++) {
/* clone the current handle */
codes_handle *clone_handle = codes_handle_clone(source_handle);
if (clone_handle == NULL) {
perror("ERROR: could not clone field");
return 1;
}
/* This is the place where you may wish to modify the clone
E.g. we change the bufrHeaderCentre */
CODES_CHECK(codes_set_long(clone_handle, "bufrHeaderCentre", 222),0);
/* get the coded message in a buffer */
CODES_CHECK(codes_get_message(clone_handle,&buffer,&size),0);
/* write the buffer to a file */
if(fwrite(buffer,1,size,out) != size) {
perror("ERROR: could not write message to file");
return 1;
}
/* relase the clone's handle */
codes_handle_delete(clone_handle);
}
/* release the source's handle */
codes_handle_delete(source_handle);
fclose(out);
fclose(in);
return 0;
}
bufr_clone.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_clone
!
! Description: how to create a new BUFR message by cloning
! an existing message.
!
!
!
program bufr_clone
use eccodes
implicit none
integer :: err,i,iret
integer :: nx, ny
integer :: infile,outfile
integer :: ibufr_in
integer :: ibufr_out
character(len=2) :: step
double precision, dimension(:,:), allocatable :: field2D
!open source file
call codes_open_file(infile,'../../data/bufr/syno_multi.bufr','r')
! open target file
call codes_open_file(outfile,'bufr_clone_test_f.clone.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_in,iret)
! create several clones of this message and alter them
! in different ways
do i=1,3
! clone the current handle
call codes_clone(ibufr_in, ibufr_out)
! This is the place where you may wish to modify the clone
! E.g. we change the bufrHeaderCentre
call codes_set(ibufr_out,'bufrHeaderCentre',222)
! write cloned messages to a file
call codes_write(ibufr_out,outfile)
! relase the clone's handle
call codes_release(ibufr_out)
end do
! relase the sources 's handle
call codes_release(ibufr_in)
call codes_close_file(infile)
call codes_close_file(outfile)
end program bufr_clone
bufr_clone.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_clone
#
# Description: how to create a new BUFR message by cloning
# an existing message.
#
#
import traceback
import sys
from eccodes import *
INPUT='../../data/bufr/syno_1.bufr'
OUTPUT='bufr_clone_test_p.clone.bufr'
VERBOSE=1 # verbose error reporting
def example():
# open bufr file
fin = open(INPUT)
# open otput bufr file
fout = open(OUTPUT,'w')
# get handle for message
gid = codes_bufr_new_from_file(fin)
# create several clones of this message and alter them
# in different ways
for centre in range(0,3):
# clone the message
clone_id = codes_clone(gid)
# this is the place where you may wish to modify the clone
codes_set(clone_id,'bufrHeaderCentre',centre)
# write the cloned message to a file
codes_write(clone_id,fout)
# relase the clone's handle
codes_release(clone_id)
# release the source's 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())