mirror of https://github.com/ecmwf/eccodes.git
96 lines
2.5 KiB
C
96 lines
2.5 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_clone
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*
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* Description: how to create new BUFR messages by cloning
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* an existing message.
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*
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*/
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#include <stdio.h>
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#include "eccodes.h"
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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* source_handle = NULL;
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const void* buffer = NULL;
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size_t size = 0;
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int i, err = 0;
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if (argc != 3) {
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return 1;
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}
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in = fopen(argv[1], "rb");
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out = fopen(argv[2], "wb");
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/* open input and output */
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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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/* create a handle for the first message */
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source_handle = codes_handle_new_from_file(NULL, in, PRODUCT_BUFR, &err);
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if (source_handle == NULL) {
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perror("ERROR: could not create handle for message");
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fclose(out);
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fclose(in);
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return 1;
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}
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/* create several clones of this message and alter them
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in different ways */
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for (i = 0; i < 3; i++) {
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/* clone the current handle */
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codes_handle* clone_handle = codes_handle_clone(source_handle);
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if (clone_handle == NULL) {
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perror("ERROR: could not clone field");
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return 1;
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}
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/* This is the place where you may wish to modify the clone
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E.g. we change the typicalDay key */
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CODES_CHECK(codes_set_long(clone_handle, "typicalDay", 20 + i), 0);
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/* get the coded message in a buffer */
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CODES_CHECK(codes_get_message(clone_handle, &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("ERROR: could not write message to file");
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return 1;
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}
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/* release the clone's handle */
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codes_handle_delete(clone_handle);
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}
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/* release the source's handle */
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codes_handle_delete(source_handle);
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fclose(out);
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fclose(in);
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return 0;
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}
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