serialportwriter.cpp Example File
cwriterasync/serialportwriter.cpp
#include "serialportwriter.h"
#include <QCoreApplication>
SerialPortWriter::SerialPortWriter(QSerialPort *serialPort, QObject *parent) :
QObject(parent),
m_serialPort(serialPort),
m_standardOutput(stdout)
{
m_timer.setSingleShot(true);
connect(m_serialPort, &QSerialPort::bytesWritten,
this, &SerialPortWriter::handleBytesWritten);
connect(m_serialPort, &QSerialPort::errorOccurred,
this, &SerialPortWriter::handleError);
connect(&m_timer, &QTimer::timeout, this, &SerialPortWriter::handleTimeout);
}
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;
const 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);
}