1. 写在前面

唔… 在公司睡了三天地板, 总算搞出来了…

环境: Qt5.14, Win10系统

2. 建立插件工程

1. 选择C++ Library
   
   
2. 创建路径
   
   
3. 建立cpp和头文件
   
   
4. 配置编译工具
   
   
5. 设置为Git
   
   
6. 生成工程文件.pro
   
   

3. 逻辑代码移植

1. 核心代码逻辑额…
   
   作为一名熟练的
   
   Ctrl
   
   +
   
   C
   
   和
   
   Ctrl
   
   +
   
   V
   
   操作工(面向开源的Ctrl + C Ctrl + V工程师), 这一点我就不卖弄了… 抄VectorCAN的逻辑就好了 ^v^

2. 具体的还需要看用的CAN盒子, 厂家提供的二次开发的dll文件;
   
   用过周立功和广成科技这两家的CAN盒子, 本以为可以通用上, 结果发现广成科技的CAN盒子驱动层的dll似乎是在周立功家的基础上再封装了一次; 无奈之下只好重写一份;

3. 关于具体的逻辑
   
   3.1. 流程
   
   
   loadDriver
   
   ==>
   
   interfaces
   
   ==>
   
   canCreate
   
   ==>
   
   openCAN
   
   ==>
   
   setupChannel
   
   ==>
   
   setBaudRate
   
   ==>
   
   startCAN
   
   ==>
   
   startRead
   
   ==>
   
   startWrite
   
   
   3.2. 接收
   
   开一个1ms~10ms的定时器, 定时接收报文插入接收队列;
   
   3.3. 发送
   
   发送队列由device接管, 插件这边只管插入发送队列, 后续通过定时器为0, 也就是尽可能快的发送出去;

2. main.cpp
   
   主要是查找有效的设备列表availableDevices和生成设备createDevice

// main.cpp
#include "gcusbcaniicbackend.h"

#include <QtSerialBus/qcanbus.h>
#include <QtSerialBus/qcanbusdevice.h>
#include <QtSerialBus/qcanbusfactory.h>

#include <QtCore/qloggingcategory.h>

#include "StatusErrorsDefine.h"
#include "debugLog.h"

QT_BEGIN_NAMESPACE

Q_LOGGING_CATEGORY(QT_CANBUS_PLUGINS_GCUSBCANIIC, "qt.canbus.plugins.gcusbcaniic")

class GCUsbCanBusPlugin : public QObject, public QCanBusFactoryV2
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QCanBusFactory" FILE "plugin.json")
    Q_INTERFACES(QCanBusFactoryV2)

public:
    QList<QCanBusDeviceInfo> availableDevices(QString *errorMessage) const override
    {
        if (Q_UNLIKELY(!GCUsbCANIICBackend::canCreate(errorMessage)))
            return QList<QCanBusDeviceInfo>();

//        QString strDes = "About to return interfaces";
//        QString strFun = "availableDevices";
//        DebugLogMethod::DebugLog(strFun, strDes);
//        QString strWarn = QString("%1 Warning!").arg(strDes);
//        QString strCrit = QString("%1 Critical!").arg(strDes);
//        qCWarning(QT_CANBUS_PLUGINS_GCUSBCANIIC, "%ls", qUtf16Printable(strWarn));
//        qCritical(QT_CANBUS_PLUGINS_GCUSBCANIIC, "%ls", qUtf16Printable(strCrit));

        return GCUsbCANIICBackend::interfaces();
    }

    QCanBusDevice *createDevice(const QString &interfaceName, QString *errorMessage) const override
    {
        QString errorReason;
        if (Q_UNLIKELY(!GCUsbCANIICBackend::canCreate(&errorReason))) {
            qCWarning(QT_CANBUS_PLUGINS_GCUSBCANIIC, "%ls", qUtf16Printable(errorReason));
            if (errorMessage)
                *errorMessage = errorReason;
            return nullptr;
        }

//        QString strDes = "About to return device";
//        QString strFun = "createDevice";
//        DebugLogMethod::DebugLog(strFun, strDes);

        auto device = new GCUsbCANIICBackend(interfaceName);
        return device;
    }
};

QT_END_NAMESPACE

#include "main.moc"

3. backend.h

// GCUsbCANIICBackend 
#ifndef GCUSBCANIICBACKEND_H
#define GCUSBCANIICBACKEND_H

#include "GCUsbCANIIC_global.h"

#include <QtSerialBus/qcanbusframe.h>
#include <QtSerialBus/qcanbusdevice.h>
#include <QtSerialBus/qcanbusdeviceinfo.h>

#include <QtCore/qvariant.h>
#include <QtCore/qvector.h>
#include <QtCore/qlist.h>

#include <QLoggingCategory>

QT_BEGIN_NAMESPACE

class GCUsbCANIICBackendPrivate;

Q_DECLARE_LOGGING_CATEGORY(QT_CANBUS_PLUGINS_GCUSBCANIIC)

//class GCUSBCANIIC_EXPORT GCUsbCANIICBackend
class GCUsbCANIICBackend : public QCanBusDevice
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(GCUsbCANIICBackend)
    Q_DISABLE_COPY(GCUsbCANIICBackend)
public:
    explicit GCUsbCANIICBackend(const QString &name, QObject *parent = nullptr);
    ~GCUsbCANIICBackend();

    bool open() override;
    void close() override;

    void setConfigurationParameter(int key, const QVariant &value) override;

    bool writeFrame(const QCanBusFrame &newData) override;

    QString interpretErrorFrame(const QCanBusFrame &errorFrame) override;

    static bool canCreate(QString *errorReason);
    static QList<QCanBusDeviceInfo> interfaces();

private:
    GCUsbCANIICBackendPrivate * const d_ptr;    // the name after GCUsbCANIICBackend##Private is believed to used the d_ptr pointer
};

QT_END_NAMESPACE

#endif // GCUSBCANIICBACKEND_H

4. 后话

能用就好哈 ^w^