Qt 插槽和信号未连接：无此信号

Question

我正在尝试处理 Qt 中的插槽和信号，为此我尝试执行以下操作：
MyTestClass class 应该向ReceiverClass class 发送信号，代码：

测试类.h

class MyTestClass : public QObject
{
    Q_OBJECT
public:
    MyTestClass();
    void makeSignal();
signals:
    void sendSignal();
};

我的测试类.cpp

MyTestClass::MyTestClass()
{
}

void MyTestClass::makeSignal()
{
    emit sendSignal();
}

存储类.h

class ReceiverClass : public QObject
{
    Q_OBJECT
public:
    ReceiverClass();
public slots:
    void receiverSlot();
};

存储类.cpp

ReceiverClass::ReceiverClass()
{
}

void ReceiverClass::receiverSlot()
{
    qInfo() << "receiverSlot called!\n";
}

主文件

...
MyTestClass testObj;
ReceiverClass receiverObj;

QObject::connect(&testObj, SIGNAL(&testObj::sendSignal()), &receiverObj, SLOT(&receiverObj::receiverSlot));

testObj.makeSignal();
...

但是，我遇到了这样的错误。
为什么 Qt 看不到信号？

QObject::connect: No such signal MyTestClass::&testObj::sendSignal() in ..\testQtProject\main.cpp:15

Answer 1

QObject::connect(&testObj, SIGNAL(&testObj::sendSignal()), &receiverObj, SLOT(&receiverObj::receiverSlot));

您正在混合 Qt 中连接信号和插槽的 2 种方法的语法，请使用：

QObject::connect(&testObj, SIGNAL(sendSignal()), &receiverObj, SLOT(receiverSlot()));

或者

QObject::connect(&testObj, &testObj::sendSignal, &receiverObj, &receiverObj::receiverSlot);

For more informations, look at https://doc.qt.io/qt-5/signalsandslots.html and https://wiki.qt.io/New_Signal_Slot_Syntax