如何解决由新QT中的QObject无效类导致的“未定义引用”编译错误

问题描述

我需要一个信号发射器类，该类将与插槽连接。

但是遇到一些编译错误。已经尝试通过Internet进行许多修复。

基本类结构：

class emiterClass:public QObject
{
    Q_OBJECT;
signals:
    void testSignal();
public:
    emiterClass();
    ~emiterClass();

    void signalEmiter();
};

错误 Error showed in Image Here 也在文本中：

/usr/bin/ld: main.o: in function `emitterClass::emitSignal()':
/mnt/Data/Documents/DevP/QT/build-terminalhelp-Desktop-Debug/../terminalhelp/main.cpp:25: undefined reference to `emitterClass::testSignal()'
/usr/bin/ld: main.o: in function `main':
/mnt/Data/Documents/DevP/QT/build-terminalhelp-Desktop-Debug/../terminalhelp/main.cpp:45: undefined reference to `emitterClass::emitterClass()'
/usr/bin/ld: /mnt/Data/Documents/DevP/QT/build-terminalhelp-Desktop-Debug/../terminalhelp/main.cpp:45: undefined reference to `emitterClass::~emitterClass()'
/usr/bin/ld: /mnt/Data/Documents/DevP/QT/build-terminalhelp-Desktop-Debug/../terminalhelp/main.cpp:45: undefined reference to `emitterClass::~emitterClass()'
/usr/bin/ld: main.o: in function `responseClass::responseClass()':
/mnt/Data/Documents/DevP/QT/build-terminalhelp-Desktop-Debug/../terminalhelp/main.cpp:30: undefined reference to `vtable for responseClass'
/usr/bin/ld: main.o: in function `responseClass::~responseClass()':
/mnt/Data/Documents/DevP/QT/build-terminalhelp-Desktop-Debug/../terminalhelp/main.cpp:30: undefined reference to `vtable for responseClass'
collect2: error: ld returned 1 exit status
make: *** [Makefile:299: terminalhelp] Error 1
06:24:35: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project terminalhelp (kit: Desktop)
When executing step "Make"

我的系统：

安装版本：Qt 5.14.2

OS：Manjrao Linux

IDE：QT Creator 4.12.4

完整源代码

#include <QCoreApplication>
#include <QObject>
#include <QDebug>
#include <QtConcurrent/QtConcurrent>

class emitterClass:public QObject
{
    Q_OBJECT;
signals:
    void testSignal();
public:
    emitterClass();
    ~emitterClass();

    void emitSignal();
};


void emitterClass::emitSignal()
{
    while(1)
    {
        system("sleep 1"); //Sleeps for a second
        emit testSignal();
        qDebug()<<"Signal Emited\n";
    }
}

class responseClass:public QObject
{
    Q_OBJECT
public slots:
    void testSlot()
    {
        qDebug()<<"Signal Recieved\n";
    }
};


int main(int argc,char *argv[])
{
    QCoreApplication a(argc,argv);

    emitterClass ec;
    responseClass rc;

    QObject::connect(&ec,SIGNAL(testSignal()),&rc,SLOT(testSlot()));
    ec.emitSignal();
    
    return a.exec();
}

解决方法

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c++qobject qt