serialportwriter.cpp Example File | Qt Serial Port 5.6

Qt 5.6 | Qt Serial Port | Command Line Writer Async Example | serialportwriter.cpp Example File

Qt 5.6.2 Reference Documentation

# 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, &QSerialPort::bytesWritten, this, &SerialPortWriter::handleBytesWritten);
          connect(m_serialPort, static_cast<void (QSerialPort::*)(QSerialPort::SerialPortError)>(&QSerialPort::error),
                  this, &SerialPortWriter::handleError);
          connect(&m_timer, &QTimer::timeout, this, &SerialPortWriter::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);
      }