QT实现CAN通信

#include "connectdialog.h"
#include "ui_connectdialog.h"

#include <QCanBus>

ConnectDialog::ConnectDialog(QWidget *parent) :
QDialog(parent),
m_ui(new Ui::ConnectDialog)
{
m_ui->setupUi(this);

m_ui->errorFilterEdit->setValidator(new QIntValidator(0, 0x1FFFFFFFU, this));

m_ui->loopbackBox->addItem(tr("unspecified"), QVariant());
m_ui->loopbackBox->addItem(tr("false"), QVariant(false));
m_ui->loopbackBox->addItem(tr("true"), QVariant(true));

m_ui->receiveOwnBox->addItem(tr("unspecified"), QVariant());
m_ui->receiveOwnBox->addItem(tr("false"), QVariant(false));
m_ui->receiveOwnBox->addItem(tr("true"), QVariant(true));

m_ui->canFdBox->addItem(tr("false"), QVariant(false));
m_ui->canFdBox->addItem(tr("true"), QVariant(true));

m_ui->dataBitrateBox->setFlexibleDateRateEnabled(true);

connect(m_ui->ok_Button, &QPushButton::clicked, this, &ConnectDialog::ok);
connect(m_ui->cancelButton, &QPushButton::clicked, this, &ConnectDialog::cancel);
connect(m_ui->useConfigurationBox, &QCheckBox::clicked,
m_ui->configurationBox, &QGroupBox::setEnabled);
connect(m_ui->pluginListBox, &QComboBox::currentTextChanged,
this, &ConnectDialog::pluginChanged);
connect(m_ui->interfaceListBox, &QComboBox::currentTextChanged,
this, &ConnectDialog::interfaceChanged);
m_ui->rawFilterEdit->hide();
m_ui->rawFilterLabel->hide();

m_ui->pluginListBox->addItems(QCanBus::instance()->plugins());

updateSettings();
}

ConnectDialog::~ConnectDialog()
{
delete m_ui;
}

ConnectDialog::Settings ConnectDialog::settings() const
{
return m_currentSettings;
}

void ConnectDialog::pluginChanged(const QString &plugin)
{
m_ui->interfaceListBox->clear();
m_interfaces = QCanBus::instance()->availableDevices(plugin);
for (const QCanBusDeviceInfo &info : qAsConst(m_interfaces))
m_ui->interfaceListBox->addItem(info.name());
}

void ConnectDialog::interfaceChanged(const QString &interface)
{
m_ui->isVirtual->setChecked(false);
m_ui->isFlexibleDataRateCapable->setChecked(false);

for (const QCanBusDeviceInfo &info : qAsConst(m_interfaces)) {
if (info.name() == interface) {
m_ui->descriptionLabel->setText(info.description());
QString serialNumber = info.serialNumber();
if (serialNumber.isEmpty())
serialNumber = tr("n/a");
m_ui->serialNumberLabel->setText(tr("Serial: %1").arg(serialNumber));
m_ui->channelLabel->setText(tr("Channel: %1").arg(info.channel()));
m_ui->isVirtual->setChecked(info.isVirtual());
m_ui->isFlexibleDataRateCapable->setChecked(info.hasFlexibleDataRate());
break;
        }
    }
}

void ConnectDialog::ok()
{
updateSettings();
accept();
}

void ConnectDialog::cancel()
{
revertSettings();
reject();
}

QString ConnectDialog::configurationValue(QCanBusDevice::ConfigurationKey key)
{
QVariant result;

for (const ConfigurationItem &item : qAsConst(m_currentSettings.configurations)) {
if (item.first == key) {
result = item.second;
break;
        }
    }

if (result.isNull() && (
key == QCanBusDevice::LoopbackKey ||
key == QCanBusDevice::ReceiveOwnKey)) {
return tr("unspecified");
    }

return result.toString();
}

void ConnectDialog::revertSettings()
{
m_ui->pluginListBox->setCurrentText(m_currentSettings.pluginName);
m_ui->interfaceListBox->setCurrentText(m_currentSettings.deviceInterfaceName);
m_ui->useConfigurationBox->setChecked(m_currentSettings.useConfigurationEnabled);

QString value = configurationValue(QCanBusDevice::LoopbackKey);
m_ui->loopbackBox->setCurrentText(value);

value = configurationValue(QCanBusDevice::ReceiveOwnKey);
m_ui->receiveOwnBox->setCurrentText(value);

value = configurationValue(QCanBusDevice::ErrorFilterKey);
m_ui->errorFilterEdit->setText(value);

value = configurationValue(QCanBusDevice::BitRateKey);
m_ui->bitrateBox->setCurrentText(value);

value = configurationValue(QCanBusDevice::CanFdKey);
m_ui->canFdBox->setCurrentText(value);

value = configurationValue(QCanBusDevice::DataBitRateKey);
m_ui->dataBitrateBox->setCurrentText(value);
}

void ConnectDialog::updateSettings()
{
m_currentSettings.pluginName = m_ui->pluginListBox->currentText();
m_currentSettings.deviceInterfaceName = m_ui->interfaceListBox->currentText();
m_currentSettings.useConfigurationEnabled = m_ui->useConfigurationBox->isChecked();

if (m_currentSettings.useConfigurationEnabled) {
m_currentSettings.configurations.clear();
// process LoopBack
if (m_ui->loopbackBox->currentIndex() != 0) {
ConfigurationItem item;
item.first = QCanBusDevice::LoopbackKey;
item.second = m_ui->loopbackBox->currentData();
m_currentSettings.configurations.append(item);
        }

// process ReceiveOwnKey
if (m_ui->receiveOwnBox->currentIndex() != 0) {
ConfigurationItem item;
item.first = QCanBusDevice::ReceiveOwnKey;
item.second = m_ui->receiveOwnBox->currentData();
m_currentSettings.configurations.append(item);
        }

// process error filter
if (!m_ui->errorFilterEdit->text().isEmpty()) {
QString value = m_ui->errorFilterEdit->text();
bool ok = false;
int dec = value.toInt(&ok);
if (ok) {
ConfigurationItem item;
item.first = QCanBusDevice::ErrorFilterKey;
item.second = QVariant::fromValue(QCanBusFrame::FrameErrors(dec));
m_currentSettings.configurations.append(item);
            }
        }

// process raw filter list
if (!m_ui->rawFilterEdit->text().isEmpty()) {
//TODO current ui not sfficient to reflect this param
        }

// process bitrate
const int bitrate = m_ui->bitrateBox->bitRate();
if (bitrate > 0) {
const ConfigurationItem item(QCanBusDevice::BitRateKey, QVariant(bitrate));
m_currentSettings.configurations.append(item);
        }

// process CAN FD setting
ConfigurationItem fdItem;
fdItem.first = QCanBusDevice::CanFdKey;
fdItem.second = m_ui->canFdBox->currentData();
m_currentSettings.configurations.append(fdItem);

// process data bitrate
const int dataBitrate = m_ui->dataBitrateBox->bitRate();
if (dataBitrate > 0) {
const ConfigurationItem item(QCanBusDevice::DataBitRateKey, QVariant(dataBitrate));
m_currentSettings.configurations.append(item);
        }
    }
}