Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

Description

This example shows: how to read values of different type of keys from BUFR messages.

Source code

Tabs Container
directionhorizontal


Tabs Page
titleCFortran 90


Code Block
languagecppnone
titlebufr_get_keys.cf90
linenumbersfalse
/*
 * !
!(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.
 */!
!
/*
! *FORTRAN C90 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[])
{
!
program bufr_get_keys
use eccodes
implicit none
integer       FILE* in = NULL;

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

       long *descriptors=NULL;
 :: ibufr
integer    double *values = NULL;
    char* typicalDate= NULL; 
:: i, count=0
integer(kind=4)    long longVal;
:: blockNumber,stationNumber
real(kind=8)    double doubleVal;
    size_t values_len=0, desc_len=0, len=0;
    int i, err=0;
    int cnt=0;
    char* infile = "../:: t2m
integer(kind=4), dimension(:), allocatable    :: descriptors
real(kind=8), dimension(:), allocatable       :: values
character(len=9)   :: typicalDate

  call codes_open_file(ifile,'../../data/bufr/syno_multi.bufr";','r')

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

  do while (iret/=CODES_END_OF_FILE)

    /* loop over the messages in! Get and print some keys form the bufr file */BUFR header
    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);

        /* read and print some data values */ 

        /* long value */
        CODES_CHECK(codes_get_long(h,"blockNumber",&longVal),0);write(*,*) 'message: ',count

    ! We need to instruct ecCodes to expand all the descriptors
    ! i.e. unpack the data values
    call codes_set(ibufr,"unpack",1);

    ! Get as character
    call codes_get(ibufr,'typicalDate',typicalDate)
    write(*,*) '  typicalDate:',typicalDate

    ! Get as integer
    call codes_get(ibufr,'blockNumber',blockNumber);
    write(*,*) '  blockNumber:',blockNumber

    ! Get as integer
    call codes_get(ibufr,'stationNumber',stationNumber);
    write(*,*) '  stationNumber:',stationNumber

    ! get as real
    call codes_get(ibufr,'airTemperatureAt2M',t2m);
    write(*,*) '  airTemperatureAt2M:',t2m

    ! ---- array of integer ----------------

    ! get the expanded descriptors
    call codes_get(ibufr,'bufrdcExpandedDescriptors',descriptors)

    do i=1,size(descriptors)
        printf("  blockNumber: %ld\n",longVal);

write(*,*) '  ',i,descriptors(i)
    enddo

    /* long value */
        CODES_CHECK(codes_get_long(h,"stationNumber",&longVal),0);
        printf("  stationNumber: %ld\n",longVal);! ---- array of real ----------------

    ! Get the expanded data values
    call codes_get(ibufr,'numericValues',values)

      do i=1,size(values)
  /* double value */
   write(*,*) '    CODES_CHECK(codes_get_double(h,"airTemperatureAt2M",&doubleVal),0);',i,values(i)
    enddo

    printf("! Get airTemperatureAt2M: %f\n",doubleVal);

as character
      call codes_get(ibufr,'typicalDate',typicalDate)
  /* ---- string value  -----------------*/ write(*,*) '  typicalDate:',typicalDate

    ! Free  arrays
 /* get the size and allocate memory*/ deallocate(values)
        CODES_CHECK(codes_get_length(h, "typicalDate", &len), 0);
        typicalDate = (char*)malloc(len*sizeof(char));deallocate(descriptors)

    ! Release the bufr message
    call codes_release(ibufr)

    ! Load the next /* get the values*/bufr message
        codes_get_string(h, "typicalDate", typicalDate, &len);call codes_bufr_new_from_file(ifile,ibufr,iret)

    count=count+1

  end  printf("  typicalDate: %s\n", typicalDate);

        /* ---- array of long ----------------*/

        /* get the size and allocate memory*/
        CODES_CHECK(codes_get_size(h,"bufrdcExpandedDescriptors",&desc_len),0);
        descriptors = malloc(desc_len*sizeof(long));

        /* get the values */
        CODES_CHECK(codes_get_long_array(h,"bufrdcExpandedDescriptors",descriptors,&desc_len),0);
        printf("  bufrdcExpandedDescriptors:\n");
        for(i = 0; i < desc_len; i++)
        {
            printf("   %ld\n",descriptors[i]);
        }

        /* ---- array of double ---------------*/

do

  ! Close file
  call codes_close_file(ifile)

end program bufr_get_keys



Tabs Page
titlePython


Code Block
languagepython
titlebufr_get_keys.py
linenumbersfalse
# (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 thehandle sizefor andmessage
 allocate memory*/
      bufr = CODEScodes_CHECK(codesbufr_get_size(h,"numericValues",&values_len),0);new_from_file(f)
        valuesif bufr = malloc(values_len*sizeof(double));

is None:
         /* get the values*/break

        CODES_CHECK(codes_get_double_array(h,"numericValues",values,&values_len),0);
print("message: %s" % cnt)

         printf("  numericValues:\n");# we need to instruct ecCodes to expand all the descriptors
        for(i = 0; i < values_len; i++)
    # i.e. unpack the data values
        codes_set(bufr, 'unpack', 1)

    {
       # ---------------------------------------------
     printf("   %.10e\n",values[i]);
        }

# get values for keys holding a single value
        /* free allocated arrays */
# ---------------------------------------------
        # Native type free(descriptors);integer
        free(values); key = 'blockNumber'

        free(typicalDate);

try:
        /* delete handle */
 print('  %s: %s' % (key,  codes_handle_delete(h);

get(bufr, key)))
        except  cnt++;CodesInternalError as err:
    }

        fclose(in);
    return 0;
}
Tabs Page
titleFortran 90
Code Block
languagenone
titlebufr_get_keys.f90
linenumbersfalse
!
!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.
!
!
! FOTRAN 90 Implementation: bufr_get_keys
!
! Description: how to read values of different type of keys from BUFR messages.
!
!
program bufr_get_keys
use eccodes
implicit none
integer     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))

       :: ifile
integer# Native type float
        key :: iret
integer= 'airTemperatureAt2M'
         try:
   :: ibufr
integer        print('  %s: %s' ::% i(key, count=0
integer(kind=4)codes_get(bufr, key)))
    :: blockNumber,stationNumber 
real(kind=8)       except CodesInternalError as err:
    :: t2m
integer(kind=4), dimension(:), allocatable    :: descriptors
real(kind=8), dimension(:), allocatable   print('Error with key="%s" : %s' % (key, err.msg))

    :: values
character(len=9)    # ::Native typicalDatetype 

  call codes_open_file(ifile,'../../data/bufr/syno_multi.bufr','r')

! 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(ifile,ibufr,iret)

  do while (iret/=CODES_END_OF_FILE)
    
    ! get and print some keys form the BUFR header 
    write(*,*) 'message: ',count

    ! we need to instruct ecCodes to expand all the descriptors 
    ! i.e. unpack the data values
    call codes_set(ibufr,"unpack",1);
    
    ! get as character
    call codes_get(ibufr,'typicalDate',typicalDate)
    write(*,*) '  typicalDate:',typicalDate
   
    ! get as integer
    call codes_get(ibufr,'blockNumber',blockNumber);
    write(*,*) '  blockNumber:',blockNumber
    
    ! get as integer
    call codes_get(ibufr,'stationNumber',stationNumber);
    write(*,*) '  stationNumber:',stationNumber
    
    ! get as real
    call codes_get(ibufr,'airTemperatureAt2M',t2m);
    write(*,*) '  airTemperatureAt2M:',t2m
   
    ! ---- array of integer ----------------
     
    ! get the exapanded descriptors
    call codes_get(ibufr,'bufrdcExpandedDescriptors',descriptors)
 
    do i=1,size(descriptors)
        write(*,*) '  ',i,descriptors(i)
    enddo  
   
    ! ---- array of real ----------------
     
    ! get the exapanded data values
    call codes_get(ibufr,'numericValues',values)
 
    do i=1,size(values)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)):
            print("   %d %06d" % (i + 1, values[i]))

        # Native type float
        key = 'numericValues'

        # 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)):
            print("   %d %.10e" % (i + 1, values[i]))

        cnt += 1

        write(*,*) '  ',i,values(i)
# delete handle
     enddo
   codes_release(bufr)

    !# getclose asthe characterfile
    call codes_get(ibufr,'typicalDate',typicalDate)
    write(*,*) '  typicalDate:',typicalDate
   f.close()


def main():
    try:
        example()
    !except freeCodesInternalError arraysas err:
     deallocate(values)
    deallocate(descriptors)

if VERBOSE:
    ! release the bufr message
    call codestraceback.print_release(ibufrexc(file=sys.stderr)

    ! load the next bufr messageelse:
    call codes_bufr_new_from_file(ifile,ibufr,iret)
    
    count=count+1
    sys.stderr.write(err.msg + '\n')

  end do  

! close file return 1


if  call codes_close_file(ifile)
 

end program bufr_get_keys__name__ == "__main__":
    sys.exit(main())



Tabs Page
titlePythonC


Code Block
languagepythoncpp
titlebufr_get_keys.pyc
linenumbersfalse
#/*
 * (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.

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

import traceback
import sys

from eccodes import *

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

def example():

    # open bufr file
    f = open(INPUT)

    cnt=0

    # loop for the messages in the file
    while 1:
        # get handle for message
        gid = codes_bufr_new_from_file(f)
        if gid is None: break
 * 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) {
        print printf("messageERROR: %s"unable %to cnt

open file    %s\n", infile);
   # we need to instruct ecCodesreturn to1;
 expand all the descriptors}

    /* loop over the # i.e. unpack the data valuesmessages in the bufr file */
    while ((h  = codes_set(gid,'unpack',1)

        #----------------------------------------------_handle_new_from_file(NULL, in, PRODUCT_BUFR, &err)) != NULL || err != CODES_SUCCESS)
    {
    # get values for keysif holding(h a== singleNULL) value{
        #----------------------------------------------
    printf("Error: unable to create handle #Nativefor type integermessage %d\n",cnt);
        key='blockNumber'
    cnt++;
    
        try:continue;
        }

    print  '  %s: %s' % (key,codes_get(gid,key))printf("message: %d\n",cnt);

        except CodesInternalError,err:
            print 'Error with key="%s" : %s' % (key,err.msg)       
/* we need to instruct ecCodes to expand the descriptors
          i.e. unpack the data values */
        #Native type integerCODES_CHECK(codes_set_long(h, "unpack", 1),0);

        key='stationNumber'
        try:/* read and print some data values */

        /* long value */
  print '  %s: %s' % CODES_CHECK(key,codes_get_long(gidh,key))
        except CodesInternalError,err: "blockNumber", &longVal),0);
        printf("    print 'Error with key="%s" : %s' % (key,err.msg) blockNumber: %ld\n", longVal);

        #Native type float/* long value */
        key='airTemperatureAt2M'
CODES_CHECK(codes_get_long(h, "stationNumber", &longVal),0);
        printf("  stationNumber:   try:%ld\n", longVal);

        /* double value */
 print  '  %s: %s' % CODES_CHECK(key,codes_get_double(gidh,key))
        except CodesInternalError,err:
            print 'Error with key="%s" : %s' % (key,err.msg)  "airTemperatureAt2M", &doubleVal),0);
        printf("  airTemperatureAt2M: %f\n", doubleVal);

        #Native type string/* ---- string value  -----------------*/

        key='typicalDate'
     /* get the size and allocate memory*/
   try:
     CODES_CHECK(codes_get_length(h, "typicalDate", &len), 0);
    print '  %s: %s'typicalDate %= (key,codes_get(gid,key))
char*)malloc(len*sizeof(char));

        /* get the values*/
  except CodesInternalError,err:
     codes_get_string(h, "typicalDate", typicalDate, &len);
    print  'Error with key="%s" printf("  typicalDate: %s' % (key,err.msg) \n", typicalDate);

        #/* ----------------- array of long ----------------*/

        #/* get valuesthe forsize anand array
        #---------------------------------allocate memory*/
        # Native type integer
CODES_CHECK(codes_get_size(h, "bufrdcExpandedDescriptors", &desc_len),0);
        descriptors key='bufrdcExpandedDescriptors'= (long*)malloc(desc_len*sizeof(long));

        #/* get size the values */
        num=codes_get_size(gid,key)CODES_CHECK(codes_get_long_array(h, "bufrdcExpandedDescriptors", descriptors, &desc_len),0);
        printprintf("  '  size of %s is: %s' % (key,num)

bufrdcExpandedDescriptors:\n");
        #for(i get= values
0; i <      values=codes_get_array(gid,keydesc_len; i++)
        for i in xrange(len(values)):{
            print printf("   %d %06d" % (i+1,values%ld\n",descriptors[i]);
        }

        /* ---- array of # Native type floatdouble ---------------*/

        key='numericValues'

        # get size/* get the size and allocate memory*/
        num=CODES_CHECK(codes_get_size(gid,key)
        print  '  size of %s is: %s' % (key,num)h, "numericValues", &values_len),0);
        values = (double*)malloc(values_len*sizeof(double));

        #/* get the values*/
        values=CODES_CHECK(codes_get_double_array(gid,key)h, "numericValues", values, &values_len),0);
        forprintf(" i in xrange(len(values)): numericValues:\n");
        for(i = 0; i print "   %d %.10e" % (i+1,values[i])

< values_len; i++)
        cnt+=1

{
         # delete handle
 printf("   %.10e\n",values[i]);
    codes_release(gid)

    #}

 close the file
    f.close()

def main():
    try: /* free allocated arrays */
        examplefree(descriptors);
      except CodesInternalError,err:  free(values);
        if VERBOSE:free(typicalDate);

        /* delete   traceback.print_exc(file=sys.stderr)handle */
        else:codes_handle_delete(h);

        cnt++;
    print >>sys.stderr,err.msg}

    fclose(in);
    return 1

if __name__ == "__main__":
    sys.exit(main())0;
}