main.cpp Example File | Qt Serial Port 5.4

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# main.cpp Example File

cwritersync/main.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2013 Laszlo Papp <lpapp@kde.org>
    ** Contact: http://www.qt-project.org/legal
    **
    ** 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 Digia. For licensing terms and
    ** conditions see http://qt.digia.com/licensing. For further information
    ** use the contact form at http://qt.digia.com/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.
    **
    ** In addition, as a special exception, Digia gives you certain additional
    ** rights. These rights are described in the Digia Qt LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include <QtSerialPort/QSerialPort>

    #include <QTextStream>
    #include <QCoreApplication>
    #include <QFile>
    #include <QStringList>

    QT_USE_NAMESPACE

    int main(int argc, char *argv[])
    {
        QCoreApplication coreApplication(argc, argv);
        int argumentCount = QCoreApplication::arguments().size();
        QStringList argumentList = QCoreApplication::arguments();

        QTextStream standardOutput(stdout);

        if (argumentCount == 1) {
            standardOutput << QObject::tr("Usage: %1 <serialportname> [baudrate]").arg(argumentList.first()) << endl;
            return 1;
        }

        QSerialPort serialPort;
        QString serialPortName = argumentList.at(1);
        serialPort.setPortName(serialPortName);

        int serialPortBaudRate = (argumentCount > 2) ? argumentList.at(2).toInt() : QSerialPort::Baud9600;
        serialPort.setBaudRate(serialPortBaudRate);

        if (!serialPort.open(QIODevice::WriteOnly)) {
            standardOutput << QObject::tr("Failed to open port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
            return 1;
        }

        QFile dataFile;
        if (!dataFile.open(stdin, QIODevice::ReadOnly)) {
            standardOutput << QObject::tr("Failed to open stdin for reading") << endl;
            return 1;
        }

        QByteArray writeData(dataFile.readAll());
        dataFile.close();

        if (writeData.isEmpty()) {
            standardOutput << QObject::tr("Either no data was currently available on the standard input for reading, or an error occurred for port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
            return 1;
        }

        qint64 bytesWritten = serialPort.write(writeData);

        if (bytesWritten == -1) {
            standardOutput << QObject::tr("Failed to write the data to port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
            return 1;
        } else if (bytesWritten != writeData.size()) {
            standardOutput << QObject::tr("Failed to write all the data to port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
            return 1;
        } else if (!serialPort.waitForBytesWritten(5000)) {
            standardOutput << QObject::tr("Operation timed out or an error occurred for port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
            return 1;
        }

        standardOutput << QObject::tr("Data successfully sent to port %1").arg(serialPortName) << endl;

        return 0;
    }