mirror of https://github.com/ecmwf/eccodes.git
60 lines
1.8 KiB
C++
60 lines
1.8 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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#include <stdio.h>
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#undef NDEBUG
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#include <assert.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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codes_handle* source_handle = NULL;
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int err = 0;
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size_t totalLength = 0, size = 0;
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unsigned char* buffer = NULL;
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codes_handle* new_handle = NULL;
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assert (argc == 3);
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printf("%ld\n", codes_get_api_version());
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in = fopen(argv[1], "rb");
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assert(in);
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source_handle = codes_handle_new_from_file(0, in, PRODUCT_GRIB, &err);
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assert(source_handle);
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// How big is the input GRIB message?
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CODES_CHECK(codes_get_message_size(source_handle, &totalLength), 0);
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// Allocate a buffer large enough to hold the message
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buffer = (unsigned char*)malloc(totalLength);
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size = totalLength;
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// Take a copy of the message into buffer. Now we own it
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CODES_CHECK(codes_get_message_copy(source_handle, buffer, &size), 0);
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assert(size == totalLength);
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codes_handle_delete(source_handle);
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// Now buffer contains a copy of the message
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new_handle = codes_handle_new_from_message(0, buffer, totalLength);
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assert(new_handle);
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// Change something and write it out
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CODES_CHECK(codes_set_long(new_handle, "hour", 18), 0);
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CODES_CHECK(codes_write_message(new_handle, argv[2], "w"), 0);
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codes_handle_delete(new_handle);
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free(buffer);
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fclose(in);
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return 0;
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}
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