KeyboardReader.cpp

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/*
 * SNode.C - a slim toolkit for network communication
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2020, 2021, 2022, 2023, 2024, 2025
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "KeyboardReader.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "utils/Timeval.h"
 
#include <iostream>
#include <stdexcept>
#include <string>
#include <sys/types.h>
#include <unistd.h>
 
#endif // DOXYGEN_SHOULD_SKIP_THIS
 
namespace apps::towercalculator {
 
    KeyboardReader::KeyboardReader(const std::function<void(long)>& cb)
        : core::eventreceiver::ReadEventReceiver("KeyboardReader", 0)
        , callBack(cb) {
        if (!enable(STDIN_FILENO)) {
            std::cout << "KeyboardReader not activated";
        }
    }
 
    void KeyboardReader::readEvent() {
        std::cout << "ReadEvent" << std::endl;
        /*
            long value;
 
            std::cin >> long;
        */
 
        char buffer[256];
        const ssize_t ret = read(STDIN_FILENO, buffer, 256);
 
        if (ret > 0) {
            buffer[ret] = 0;
            try {
                long value = 0;
                value = std::stol(buffer);
 
                std::cout << "Value = " << value << std::endl;
 
                callBack(value);
            } catch (std::invalid_argument& e) {
                std::cout << e.what() << ": "
                          << "no conversion possible: input = " << buffer << std::endl;
            }
        }
    }
 
    void KeyboardReader::unobservedEvent() {
        //    delete this; // do not delete
    }
 
} // namespace apps::towercalculator