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
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  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/

  #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);
  }