Qt实现简单的can通信 头文件和cpp文件和ui文件都要

以下是一个简单的 Qt 实现 CAN 通信的示例，包括头文件、源文件和 UI 文件。

CANWidget.h：

#ifndef CANWIDGET_H
#define CANWIDGET_H

#include <QWidget>
#include <QCanBus>
#include <QCanBusDevice>
#include <QTimer>

namespace Ui {
class CANWidget;
}

class CANWidget : public QWidget
{
    Q_OBJECT

public:
    explicit CANWidget(QWidget *parent = nullptr);
    ~CANWidget();

private:
    Ui::CANWidget *ui;
    QCanBusDevice *m_canDevice;
    QTimer *m_timer;

private slots:
    void onConnectButtonClicked();
    void onSendButtonClicked();
    void onTimeout();
};

#endif // CANWIDGET_H

CANWidget.cpp：

#include "CANWidget.h"
#include "ui_CANWidget.h"

#include <QDebug>
#include <QCanBusFrame>

CANWidget::CANWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::CANWidget),
    m_canDevice(nullptr),
    m_timer(nullptr)
{
    ui->setupUi(this);

    // 初始化定时器，用于周期性发送数据
    m_timer = new QTimer(this);
    connect(m_timer, &QTimer::timeout, this, &CANWidget::onTimeout);

    // 初始化 CAN 设备选择框
    const auto supportedDevices = QCanBus::instance()->availableDevices("socketcan");
    for (const auto &device : supportedDevices) {
        ui->deviceComboBox->addItem(device.name());
    }
}

CANWidget::~CANWidget()
{
    delete ui;
}

void CANWidget::onConnectButtonClicked()
{
    if (!m_canDevice) {
        // 创建 CAN 设备
        const QString deviceName = ui->deviceComboBox->currentText();
        m_canDevice = QCanBus::instance()->createDevice("socketcan", deviceName);

        // 打开 CAN 设备
        if (m_canDevice && m_canDevice->connectDevice()) {
            ui->connectButton->setText(tr("Disconnect"));
            ui->statusLabel->setText(tr("Connected"));
            ui->sendButton->setEnabled(true);
            m_timer->start(1000); // 1 秒钟发送一次数据
        } else {
            ui->statusLabel->setText(tr("Error: %1").arg(m_canDevice->errorString()));
            delete m_canDevice;
            m_canDevice = nullptr;
        }
    } else {
        // 断开 CAN 设备
        m_timer->stop();
        m_canDevice->disconnectDevice();
        delete m_canDevice;
        m_canDevice = nullptr;
        ui->connectButton->setText(tr("Connect"));
        ui->statusLabel->setText(tr("Disconnected"));
        ui->sendButton->setEnabled(false);
    }
}

void CANWidget::onSendButtonClicked()
{
    if (m_canDevice) {
        // 构造 CAN 帧
        QCanBusFrame frame;
        frame.setFrameId(ui->idLineEdit->text().toInt(nullptr, 16));
        frame.setPayload(QByteArray::fromHex(ui->dataLineEdit->text().toLatin1()));
        frame.setExtendedFrameFormat(ui->extendedCheckBox->isChecked());
        frame.setRemoteRequest(ui->remoteCheckBox->isChecked());

        // 发送 CAN 帧
        if (!m_canDevice->writeFrame(frame)) {
            ui->statusLabel->setText(tr("Error: %1").arg(m_canDevice->errorString()));
        }
    }
}

void CANWidget::onTimeout()
{
    if (m_canDevice) {
        // 构造 CAN 帧
        QCanBusFrame frame;
        frame.setFrameId(0x123);
        frame.setPayload("Hello, CAN!");
        frame.setExtendedFrameFormat(false);
        frame.setRemoteRequest(false);

        // 发送 CAN 帧
        if (!m_canDevice->writeFrame(frame)) {
            ui->statusLabel->setText(tr("Error: %1").arg(m_canDevice->errorString()));
        }
    }
}

CANWidget.ui：

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>CANWidget</class>
 <widget class="QWidget" name="CANWidget">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>CANWidget</string>
  </property>
  <layout class="QVBoxLayout" name="verticalLayout">
   <item>
    <layout class="QHBoxLayout" name="horizontalLayout">
     <item>
      <label for="deviceComboBox">
       <string>Device:</string>
      </label>
     </item>
     <item>
      <combobox editable="false" name="deviceComboBox"/>
     </item>
     <item>
      <pushbutton name="connectButton">
       <string>Connect</string>
      </pushbutton>
     </item>
    </layout>
   </item>
   <item>
    <groupbox title="CAN Frame" name="groupBox">
     <layout class="QVBoxLayout" name="verticalLayout_2">
      <item>
       <layout class="QHBoxLayout" name="horizontalLayout_2">
        <item>
         <label for="idLineEdit">
          <string>Id:</string>
         </label>
        </item>
        <item>
         <lineedit inputMask="HHHHHHHH" maxLength="8" name="idLineEdit"/>
        </item>
        <item>
         <checkbox name="extendedCheckBox">
          <string>Extended</string>
         </checkbox>
        </item>
        <item>
         <checkbox name="remoteCheckBox">
          <string>Remote</string>
         </checkbox>
        </item>
       </layout>
      </item>
      <item>
       <layout class="QHBoxLayout" name="horizontalLayout_3">
        <item>
         <label for="dataLineEdit">
          <string>Data:</string>
         </label>
        </item>
        <item>
         <lineedit inputMask="HH HH HH HH HH HH HH HH" maxLength="23" name="dataLineEdit"/>
        </item>
        <item>
         <pushbutton name="sendButton">
          <string>Send</string>
         </pushbutton>
        </item>
       </layout>
      </item>
     </layout>
    </groupbox>
   </item>
   <item>
    <label name="statusLabel">
     <string>Disconnected</string>
    </label>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>