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c++ - 为 qlibrary 在 dll 中编译 qobject 时出错

问题描述

我编写了一些用于动态加载 *.dll 文件的核心。作为主要工具，我使用 Qt 5.12 企业版。该 dll 必须通过 QLibrary 下载其他 qobject 继承类，以便在核心程序中连接和使用它，通过信号/插槽连接它。但是在编译 dll 时，应该通过 qlibrary 下载，我收到一条错误消息“vtable 的未定义引用，驱动程序接口”，我在堆栈溢出上看到了相同的问题，但其中的解决方案是尝试清理和重建项目，不不适合我。也许我应该包括其他 moc 文件，但是哪个？我使用 qmake 作为构建系统。所有纯虚方法都在继承类中重新定义。下面列出。

#ifndef DRIVER101104_H
#define DRIVER101104_H

#include "driver101-104_global.h"
#include "driverinterface.h"
#include "protocol101104wrapper.h"
#include <QObject>
#include <functional>
#include <QHash>

class Driver101104 : public DriverInterface
{
    Q_OBJECT
public:
    Driver101104();
    virtual ~Driver101104();
    // DriverInterface interface
public:
    void setMessageAsString(const QString &_message);
    QString getMessageAsString();
    void initializeChannel(const QJsonObject& _parameters);
    bool downloadTagsModel(const QHash<QString, std::shared_ptr<TagModel> > &_tagModels);
    void setCallBackFunction(const QString &_nameOfCallBack, std::function<void (const QString &)> _callback);
private:
    protocol101104Wrapper wrapper;
};

extern "C"{
    DRIVER101104SHARED_EXPORT DriverInterface* createDriverClass(){
        return new Driver101104();
    }
}

#endif // DRIVER101104_H



#ifndef DRIVERINTERFACE_H
#define DRIVERINTERFACE_H
#include <QHash>
#include <memory>
#include <functional>
#include <QJsonObject>
#include <QObject>

class TagModel;

class DriverInterface : public QObject
{
    Q_OBJECT
public:
    DriverInterface() : QObject(nullptr){

    }

    virtual ~DriverInterface() {

    }
    /*This methods are for external type of driver connection!
     * All other logick have to be In usual cases.*/
    virtual void setMessageAsString(const QString& _message) = 0;
    virtual QString getMessageAsString() = 0;

    /*This method for type of external LinkAgent and external driver!*/
    virtual void initializeChannel(const QJsonObject& _parameters) = 0;
    virtual void setCallBackFunction(const QString& _nameOfCallBack,
                                     std::function<void (const QString& _message)> _callBack) = 0;


    /*Usual type of working, Device download tags model into it's own storage
     * and serialize or deserialize it.*/
    virtual bool downloadTagsModel(const QHash<QString, std::shared_ptr<TagModel>>& _tagModels) = 0;
};

    #endif // DRIVERINTERFACE_H



#-------------------------------------------------
#
# Project created by QtCreator 2019-10-14T15:08:10
#
#-------------------------------------------------

QT       -= gui

TARGET = Driver101-104
TEMPLATE = lib

DEFINES += DRIVER101104_LIBRARY

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

include(LibHeaders.pri)
include(LibSources.pri)

CONFIG += c++11

SOURCES += \
        callbacknames.cpp \
        driver101104.cpp \
        protocol101104wrapper.cpp \
        servicenames.cpp

HEADERS += \
        callbacknames.h \
        driver101104.h \
        driver101-104_global.h  \
        driverinterface.h \
        enums.h \
        protocol101104wrapper.h \
        servicenames.h

unix {
    target.path = /usr/lib
    INSTALLS += target
}



#include "driver101104.h"

Driver101104::Driver101104():DriverInterface()
{
}

Driver101104::~Driver101104()
{

}

void Driver101104::setMessageAsString(const QString &_message)
{

}

QString Driver101104::getMessageAsString()
{

}

/**
 * @brief Driver101104::initializeChannel
 * @param _parameters
 */
void Driver101104::initializeChannel(const QJsonObject& _parameters)
{
   wrapper.channelInitializer(_parameters);
}


/**
 * @brief Driver101104::downloadTagsModel
 * Here should be something that return code
 * of error for this program
 * @param _tagModels
 * @return
 */

bool Driver101104::downloadTagsModel(const QHash<QString, std::shared_ptr<TagModel> >& _tagModels)
{
    return true;
}

void Driver101104::setCallBackFunction(const QString &_nameOfFunction, std::function<void (const QString&)> _callback)
{
    wrapper.setCallBackFunction(_nameOfFunction,_callback);
}

标签： c++qtdllqmake

解决方案

我找到了这个问题的答案，我重写了driverInterface和driver01104的类，之后，一切都正确了。库已加载并正常工作。仅与信号和插槽的连接不起作用。

    #ifndef DRIVER101104_H
#define DRIVER101104_H

#include <QObject>
#include <functional>
#include <QHash>
#include "driver101-104_global.h"
#include "protocol101104wrapper.h"
#include "driverinterface.h"

class DRIVER101104SHARED_EXPORT Driver101104 : public DriverInterface
{
    Q_OBJECT
public:
    Driver101104(QObject* parent = nullptr);
    virtual ~Driver101104();

public:
    void initializeChannel(const QJsonObject &_parameters);
    void setCallBackFunction(const QString &_nameOfCallBack,
                             std::function<void (const QString &)> _callback);
    bool downloadTagsModel(const QHash<QString,
                           std::shared_ptr<TagModel> > &_tagModels);
    void setMessageAsString(const QString &_message);
    QString getMessageAsString();


private:
    protocol101104Wrapper* wrapper;
};

extern "C"{
    DRIVER101104SHARED_EXPORT DriverInterface* createDriverClass();
}

#endif // DRIVER101104_H



#ifndef DRIVERINTERFACE_H
#define DRIVERINTERFACE_H

#include <QObject>
#include <functional>
#include <QString>
#include <memory>
#include <QHash>
#include <QJsonObject>

class TagModel;

class DriverInterface : public QObject
{
    Q_OBJECT
public:

    DriverInterface(QObject* parent = nullptr): QObject(parent){

    }

    virtual ~DriverInterface(){

    }

    virtual void setMessageAsString(const QString& _message) = 0;
    virtual void initializeChannel(const QJsonObject& _parameters) = 0;
    virtual void setCallBackFunction(const QString &_nameOfCallBack,
                             std::function<void (const QString &)> _callback) = 0;
    virtual bool downloadTagsModel(const QHash<QString,
                           std::shared_ptr<TagModel> >& _tagModels) = 0;
    virtual QString getMessageAsString() = 0;

signals:
    void callBackMessage(QJsonObject _message);

};

#endif // DRIVERINTERFACE_H

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