mainwindow.cpp Example File

can/mainwindow.cpp
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#include "mainwindow.h" #include "ui_mainwindow.h" #include "connectdialog.h" #include <QCanBus> #include <QCanBusFrame> #include <QCloseEvent> #include <QDesktopServices> #include <QTimer> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), m_ui(new Ui::MainWindow) { m_ui->setupUi(this); m_connectDialog = new ConnectDialog; m_status = new QLabel; m_ui->statusBar->addPermanentWidget(m_status); m_written = new QLabel; m_ui->statusBar->addWidget(m_written); initActionsConnections(); QTimer::singleShot(50, m_connectDialog, &ConnectDialog::show); } MainWindow::~MainWindow() { delete m_canDevice; delete m_connectDialog; delete m_ui; } void MainWindow::initActionsConnections() { m_ui->actionDisconnect->setEnabled(false); m_ui->sendFrameBox->setEnabled(false); connect(m_ui->sendFrameBox, &SendFrameBox::sendFrame, this, &MainWindow::sendFrame); connect(m_ui->actionConnect, &QAction::triggered, m_connectDialog, &ConnectDialog::show); connect(m_connectDialog, &QDialog::accepted, this, &MainWindow::connectDevice); connect(m_ui->actionDisconnect, &QAction::triggered, this, &MainWindow::disconnectDevice); connect(m_ui->actionQuit, &QAction::triggered, this, &QWidget::close); connect(m_ui->actionAboutQt, &QAction::triggered, qApp, &QApplication::aboutQt); connect(m_ui->actionClearLog, &QAction::triggered, m_ui->receivedMessagesEdit, &QTextEdit::clear); connect(m_ui->actionPluginDocumentation, &QAction::triggered, this, []() { QDesktopServices::openUrl(QUrl("http://doc.qt.io/qt-5/qtcanbus-backends.html#can-bus-plugins")); }); } void MainWindow::processErrors(QCanBusDevice::CanBusError error) const { switch (error) { case QCanBusDevice::ReadError: case QCanBusDevice::WriteError: case QCanBusDevice::ConnectionError: case QCanBusDevice::ConfigurationError: case QCanBusDevice::UnknownError: m_status->setText(m_canDevice->errorString()); break; default: break; } } void MainWindow::connectDevice() { const ConnectDialog::Settings p = m_connectDialog->settings(); QString errorString; m_canDevice = QCanBus::instance()->createDevice(p.pluginName, p.deviceInterfaceName, &errorString); if (!m_canDevice) { m_status->setText(tr("Error creating device '%1', reason: '%2'") .arg(p.pluginName).arg(errorString)); return; } m_numberFramesWritten = 0; connect(m_canDevice, &QCanBusDevice::errorOccurred, this, &MainWindow::processErrors); connect(m_canDevice, &QCanBusDevice::framesReceived, this, &MainWindow::processReceivedFrames); connect(m_canDevice, &QCanBusDevice::framesWritten, this, &MainWindow::processFramesWritten); if (p.useConfigurationEnabled) { for (const ConnectDialog::ConfigurationItem &item : p.configurations) m_canDevice->setConfigurationParameter(item.first, item.second); } if (!m_canDevice->connectDevice()) { m_status->setText(tr("Connection error: %1").arg(m_canDevice->errorString())); delete m_canDevice; m_canDevice = nullptr; } else { m_ui->actionConnect->setEnabled(false); m_ui->actionDisconnect->setEnabled(true); m_ui->sendFrameBox->setEnabled(true); const QVariant bitRate = m_canDevice->configurationParameter(QCanBusDevice::BitRateKey); if (bitRate.isValid()) { const bool isCanFd = m_canDevice->configurationParameter(QCanBusDevice::CanFdKey).toBool(); const QVariant dataBitRate = m_canDevice->configurationParameter(QCanBusDevice::DataBitRateKey); if (isCanFd && dataBitRate.isValid()) { m_status->setText(tr("Plugin: %1, connected to %2 at %3 / %4 kBit/s") .arg(p.pluginName).arg(p.deviceInterfaceName) .arg(bitRate.toInt() / 1000).arg(dataBitRate.toInt() / 1000)); } else { m_status->setText(tr("Plugin: %1, connected to %2 at %3 kBit/s") .arg(p.pluginName).arg(p.deviceInterfaceName) .arg(bitRate.toInt() / 1000)); } } else { m_status->setText(tr("Plugin: %1, connected to %2") .arg(p.pluginName).arg(p.deviceInterfaceName)); } } } void MainWindow::disconnectDevice() { if (!m_canDevice) return; m_canDevice->disconnectDevice(); delete m_canDevice; m_canDevice = nullptr; m_ui->actionConnect->setEnabled(true); m_ui->actionDisconnect->setEnabled(false); m_ui->sendFrameBox->setEnabled(false); m_status->setText(tr("Disconnected")); } void MainWindow::processFramesWritten(qint64 count) { m_numberFramesWritten += count; m_written->setText(tr("%1 frames written").arg(m_numberFramesWritten)); } void MainWindow::closeEvent(QCloseEvent *event) { m_connectDialog->close(); event->accept(); } static QString frameFlags(const QCanBusFrame &frame) { QString result = QLatin1String(" --- "); if (frame.hasBitrateSwitch()) result[1] = QLatin1Char('B'); if (frame.hasErrorStateIndicator()) result[2] = QLatin1Char('E'); if (frame.hasLocalEcho()) result[3] = QLatin1Char('L'); return result; } void MainWindow::processReceivedFrames() { if (!m_canDevice) return; while (m_canDevice->framesAvailable()) { const QCanBusFrame frame = m_canDevice->readFrame(); QString view; if (frame.frameType() == QCanBusFrame::ErrorFrame) view = m_canDevice->interpretErrorFrame(frame); else view = frame.toString(); const QString time = QString::fromLatin1("%1.%2 ") .arg(frame.timeStamp().seconds(), 10, 10, QLatin1Char(' ')) .arg(frame.timeStamp().microSeconds() / 100, 4, 10, QLatin1Char('0')); const QString flags = frameFlags(frame); m_ui->receivedMessagesEdit->append(time + flags + view); } } void MainWindow::sendFrame(const QCanBusFrame &frame) const { if (!m_canDevice) return; m_canDevice->writeFrame(frame); }

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