mirror of https://github.com/ecmwf/eccodes.git
102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
/*
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* (C) Copyright 2005- ECMWF.
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*
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* This software is licensed under the terms of the Apache Licence Version 2.0
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* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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*
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* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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*/
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/*
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* C Implementation: bufr_set_keys
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*
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* Description: how to set different type of keys in BUFR messages.
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*
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*/
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#include "eccodes.h"
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static void usage(const char* prog)
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{
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printf("usage: %s infile\n", prog);
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exit(1);
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}
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int main(int argc, char* argv[])
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{
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FILE* in = NULL;
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FILE* out = NULL;
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/* message handle. Required in all the eccodes calls acting on a message.*/
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codes_handle* h = NULL;
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long longVal;
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/*double doubleVal;*/
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int err = 0;
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int cnt = 0;
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size_t size = 0;
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const char* infile = "../../data/bufr/syno_multi.bufr";
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const void* buffer = NULL;
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if (argc != 2) {
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usage(argv[0]);
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return 1;
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}
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in = fopen(infile, "rb");
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out = fopen(argv[1], "wb");
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if (!in || !out) {
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perror("Error: unable to open files");
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if (out) fclose(out);
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if (in) fclose(in);
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return 1;
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}
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/* loop over the messages in the BUFR file */
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while ((h = codes_handle_new_from_file(NULL, in, PRODUCT_BUFR, &err)) != NULL || err != CODES_SUCCESS) {
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if (h == NULL) {
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fprintf(stderr, "Error: unable to create handle for message %d\n", cnt);
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cnt++;
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continue;
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}
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printf("message: %d\n", cnt);
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/* we need to instruct ecCodes to expand the descriptors
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i.e. unpack the data values */
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/*CODES_CHECK(codes_set_long(h,"unpack",1),0);*/
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/* this is the place where you may wish to modify the message */
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/* e.g. we change the centre */
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/* set bufrHeaderCentre */
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longVal = 222;
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CODES_CHECK(codes_set_long(h, "bufrHeaderCentre", longVal), 0);
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printf(" set bufrHeaderCentre to: %ld\n", longVal);
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/* check bufrHeaderCentre */
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CODES_CHECK(codes_get_long(h, "bufrHeaderCentre", &longVal), 0);
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printf(" bufrHeaderCentre's new value is: %ld\n", longVal);
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/* get the modified message in a buffer */
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CODES_CHECK(codes_get_message(h, &buffer, &size), 0);
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/* write the buffer to a file */
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if (fwrite(buffer, 1, size, out) != size) {
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perror(argv[0]);
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return 1;
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}
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/* delete handle */
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codes_handle_delete(h);
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cnt++;
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}
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fclose(in);
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return 0;
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}
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