serialportwriter.cpp Example File | Qt Serial Port 5.5

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# serialportwriter.cpp Example File

cwriterasync/serialportwriter.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2013 Laszlo Papp <lpapp@kde.org>
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the QtSerialPort module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL21$
    ** Commercial License Usage
    ** Licensees holding valid commercial Qt licenses may use this file in
    ** accordance with the commercial license agreement provided with the
    ** Software or, alternatively, in accordance with the terms contained in
    ** a written agreement between you and The Qt Company. For licensing terms
    ** and conditions see http://www.qt.io/terms-conditions. For further
    ** information use the contact form at http://www.qt.io/contact-us.
    **
    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 2.1 or version 3 as published by the Free
    ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
    ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
    ** following information to ensure the GNU Lesser General Public License
    ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
    ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    **
    ** As a special exception, The Qt Company gives you certain additional
    ** rights. These rights are described in The Qt Company LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include "serialportwriter.h"

    #include <QCoreApplication>

    QT_USE_NAMESPACE

    SerialPortWriter::SerialPortWriter(QSerialPort *serialPort, QObject *parent)
        : QObject(parent)
        , m_serialPort(serialPort)
        , m_standardOutput(stdout)
        , m_bytesWritten(0)
    {
        m_timer.setSingleShot(true);
        connect(m_serialPort, SIGNAL(bytesWritten(qint64)), SLOT(handleBytesWritten(qint64)));
        connect(m_serialPort, SIGNAL(error(QSerialPort::SerialPortError)), SLOT(handleError(QSerialPort::SerialPortError)));
        connect(&m_timer, SIGNAL(timeout()), SLOT(handleTimeout()));
    }

    SerialPortWriter::~SerialPortWriter()
    {
    }

    void SerialPortWriter::handleBytesWritten(qint64 bytes)
    {
        m_bytesWritten += bytes;
        if (m_bytesWritten == m_writeData.size()) {
            m_bytesWritten = 0;
            m_standardOutput << QObject::tr("Data successfully sent to port %1").arg(m_serialPort->portName()) << endl;
            QCoreApplication::quit();
        }
    }

    void SerialPortWriter::handleTimeout()
    {
        m_standardOutput << QObject::tr("Operation timed out for port %1, error: %2").arg(m_serialPort->portName()).arg(m_serialPort->errorString()) << endl;
        QCoreApplication::exit(1);
    }

    void SerialPortWriter::handleError(QSerialPort::SerialPortError serialPortError)
    {
        if (serialPortError == QSerialPort::WriteError) {
            m_standardOutput << QObject::tr("An I/O error occurred while writing the data to port %1, error: %2").arg(m_serialPort->portName()).arg(m_serialPort->errorString()) << endl;
            QCoreApplication::exit(1);
        }
    }

    void SerialPortWriter::write(const QByteArray &writeData)
    {
        m_writeData = writeData;

        qint64 bytesWritten = m_serialPort->write(writeData);

        if (bytesWritten == -1) {
            m_standardOutput << QObject::tr("Failed to write the data to port %1, error: %2").arg(m_serialPort->portName()).arg(m_serialPort->errorString()) << endl;
            QCoreApplication::exit(1);
        } else if (bytesWritten != m_writeData.size()) {
            m_standardOutput << QObject::tr("Failed to write all the data to port %1, error: %2").arg(m_serialPort->portName()).arg(m_serialPort->errorString()) << endl;
            QCoreApplication::exit(1);
        }

        m_timer.start(5000);
    }