mirror of https://github.com/ecmwf/eccodes.git
121 lines
3.7 KiB
C
121 lines
3.7 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_get_keys
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*
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* Description: how to read values of different type of keys from BUFR messages.
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*
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*/
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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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/* 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* descriptors = NULL;
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double* values = NULL;
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char* typicalDate = NULL;
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long longVal;
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double doubleVal;
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size_t values_len = 0, desc_len = 0, len = 0;
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int i, err = 0;
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int cnt = 0;
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const char* infile = "../../data/bufr/syno_multi.bufr";
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in = fopen(infile, "rb");
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if (!in) {
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fprintf(stderr, "Error: unable to open file %s\n", infile);
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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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/* read and print some data values */
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/* long value */
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CODES_CHECK(codes_get_long(h, "blockNumber", &longVal), 0);
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printf(" blockNumber: %ld\n", longVal);
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/* long value */
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CODES_CHECK(codes_get_long(h, "stationNumber", &longVal), 0);
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printf(" stationNumber: %ld\n", longVal);
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/* double value */
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CODES_CHECK(codes_get_double(h, "airTemperatureAt2M", &doubleVal), 0);
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printf(" airTemperatureAt2M: %f\n", doubleVal);
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/* ---- string value -----------------*/
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/* get the size and allocate memory*/
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CODES_CHECK(codes_get_length(h, "typicalDate", &len), 0);
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typicalDate = (char*)malloc(len * sizeof(char));
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/* get the values*/
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codes_get_string(h, "typicalDate", typicalDate, &len);
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printf(" typicalDate: %s\n", typicalDate);
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/* ---- array of long ----------------*/
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/* get the size and allocate memory*/
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CODES_CHECK(codes_get_size(h, "bufrdcExpandedDescriptors", &desc_len), 0);
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descriptors = (long*)malloc(desc_len * sizeof(long));
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/* get the values */
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CODES_CHECK(codes_get_long_array(h, "bufrdcExpandedDescriptors", descriptors, &desc_len), 0);
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printf(" bufrdcExpandedDescriptors:\n");
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for (i = 0; i < desc_len; i++) {
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printf(" %ld\n", descriptors[i]);
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}
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/* ---- array of double ---------------*/
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/* get the size and allocate memory*/
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CODES_CHECK(codes_get_size(h, "numericValues", &values_len), 0);
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values = (double*)malloc(values_len * sizeof(double));
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/* get the values*/
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CODES_CHECK(codes_get_double_array(h, "numericValues", values, &values_len), 0);
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printf(" numericValues:\n");
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for (i = 0; i < values_len; i++) {
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printf(" %.10e\n", values[i]);
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}
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/* free allocated arrays */
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free(descriptors);
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free(values);
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free(typicalDate);
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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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