QTcanbus例程源码-can.rar

/**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the QtSerialBus module. ** ** $QT_BEGIN_LICENSE:BSD$ ** 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 https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "mainwindow.h" #include "ui_mainwindow.h" #include "connectdialog.h" #include <QCanBus> #include <QCanBusFrame> #include <QCloseEvent> #include <QDesktopServices> #include <QtDebug> #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->addWidget(m_status); m_ui->sendMessagesBox->setEnabled(false); initActionsConnections(); QTimer::singleShot(50, m_connectDialog, &ConnectDialog::show); connect(m_ui->sendButton, &QPushButton::clicked, this, &MainWindow::sendMessage); } MainWindow::~MainWindow() { delete m_canDevice; delete m_connectDialog; delete m_ui; } void MainWindow::showStatusMessage(const QString &message) { m_status->setText(message); } void MainWindow::initActionsConnections() { m_ui->actionConnect->setEnabled(true); m_ui->actionDisconnect->setEnabled(false); m_ui->actionQuit->setEnabled(true); 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::receiveError(QCanBusDevice::CanBusError error) const { switch (error) { case QCanBusDevice::ReadError: case QCanBusDevice::WriteError: case QCanBusDevice::ConnectionError: case QCanBusDevice::ConfigurationError: case QCanBusDevice::UnknownError: qWarning() << m_canDevice->errorString(); default: break; } } void MainWindow::connectDevice() { const ConnectDialog::Settings p = m_connectDialog->settings(); QString errorString; m_canDevice = QCanBus::instance()->createDevice(p.backendName, p.deviceInterfaceName, &errorString); if (!m_canDevice) { showStatusMessage(tr("Error creating device '%1', reason: '%2'") .arg(p.backendName).arg(errorString)); return; } connect(m_canDevice, &QCanBusDevice::errorOccurred, this, &MainWindow::receiveError); connect(m_canDevice, &QCanBusDevice::framesReceived, this, &MainWindow::checkMessages); connect(m_canDevice, &QCanBusDevice::framesWritten, this, &MainWindow::framesWritten); if (p.useConfigurationEnabled) { for (const ConnectDialog::ConfigurationItem &item : p.configurations) m_canDevice->setConfigurationParameter(item.first, item.second); } if (!m_canDevice->connectDevice()) { showStatusMessage(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->sendMessagesBox->setEnabled(true); QVariant bitRate = m_canDevice->configurationParameter(QCanBusDevice::BitRateKey); if (bitRate.isValid()) { showStatusMessage(tr("Backend: %1, connected to %2 at %3 kBit/s") .arg(p.backendName).arg(p.deviceInterfaceName) .arg(bitRate.toInt() / 1000)); } else { showStatusMessage(tr("Backend: %1, connected to %2") .arg(p.backendName).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->sendMessagesBox->setEnabled(false); showStatusMessage(tr("Disconnected")); } void MainWindow::framesWritten(qint64 count) { qDebug() << "Number of frames written:" << count; } void MainWindow::closeEvent(QCloseEvent *event) { m_connectDialog->close(); event->accept(); } static QString frameFlags(const QCanBusFrame &frame) { if (frame.hasBitrateSwitch() && frame.hasErrorStateIndicator()) return QStringLiteral(" B E "); if (frame.hasBitrateSwitch()) return QStringLiteral(" B - "); if (frame.hasErrorStateIndicator()) return QStringLiteral(" - E "); return QStringLiteral(" - - "); } void MainWindow::checkMessages() { 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(