Qt 5.9 | Qt Serial Port | Command Line Writer Async Example | serialportwriter.cpp Example File

Qt 5.9.4 Reference Documentation

# serialportwriter.cpp Example File

cwriterasync/serialportwriter.cpp

      /****************************************************************************
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      ** Copyright (C) 2013 Laszlo Papp <lpapp@kde.org>
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      #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);
      }