read_write_fixedlen_string.cpp

/*
 *  Copyright (c), 2020, Blue Brain Project
 *
 *  Distributed under the Boost Software License, Version 1.0.
 *    (See accompanying file LICENSE_1_0.txt or copy at
 *          http://www.boost.org/LICENSE_1_0.txt)
 *
 */
#include <iostream>
#include <string>
#include <vector>

#include <highfive/H5File.hpp>
#include <highfive/H5DataSet.hpp>
#include <highfive/H5DataSpace.hpp>

using namespace HighFive;

static const std::string FILE_NAME("create_dataset_string_example.h5");

// create a dataset from a vector of string
// read it back and print it
int main(void) {

    try {
        // Create a new file using the default property lists.
        File file(FILE_NAME, File::ReadWrite | File::Create | File::Truncate);
        const char strings_fixed[][16] = {"abcabcabcabcabc", "123123123123123"};

        // create a dataset ready to contains strings of the size of the vector
        file.createDataSet<char[10]>("ds1", DataSpace(2)).write(strings_fixed);

        // Without specific type info this will create an int8 dataset
        file.createDataSet("ds2", strings_fixed);

        // Now test the new interface type
        FixedLenStringArray<10> arr{"0000000", "1111111"};  // also accepts std::vector
        auto ds = file.createDataSet("ds3", arr);

        // Read back truncating to 4 chars
        FixedLenStringArray<4> array_back;
        ds.read(array_back);
        std::cout << "First item is '" << array_back[0] << "'" << std::endl
                  << "Second item is '" << array_back[1] << "'" << std::endl;


    } catch (const Exception& err) {
        // catch and print any HDF5 error
        std::cerr << err.what() << std::endl;
    }

    return 0; // successfully terminated
}