CODEWITHSUNDEEP
c++qt
Rajeshwar
Rajeshwar

Reputation: 11651

Signal and slot example not working

While trying to familiarize myself to the signal slot concept. I came up with the following code

class Person: public QObject
{
    Q_OBJECT 
public:
    void SignalEmitter(QString Words); //This emits the signal
    Person(QObject *parent = 0);
signals:
    void Call(QString Words); //This is the signal
};

class Animal: public QObject
{
    Q_OBJECT 
public:
    Animal(QObject *parent = 0);
public slots:
    void Respond(QString Words); //This is the slot
};

class SomeClass: public QObject
{

    Q_OBJECT 
        public:
        SomeClass(QObject *parent = 0);
};

Now the objective is simple - The person sends a signal and the animal receives it in a slot Here is my implementation

void Person::SignalEmitter(QString Words)
{
    //Emit the signal
    emit Call("Signal emitted");
}

void Animal::Respond(QString Words)
{
    qDebug() <<"Responding " << Words;
    std::string d= "Breakpoint should be here";
}

//This is the code

SomeClass::SomeClass(QObject *parent):QObject(parent)
{
    Person *p = new Person();
    Animal *a = new Animal();
    connect(p,SIGNAL(SignalEmitter(QString)) ,a,SLOT(Respond(QString)));
    p->SignalEmitter("Lassie");
    std::string d = "dd";
}

Unfortunately the breakpoint never hits Animal::Respond(QString Words) any suggestions on what I might be doing wrong ?

Upvotes: 1

Views: 144

Answers (1)

Muckle_ewe
Muckle_ewe

Reputation: 1123

I believe the SIGNAL in the following

connect(p,SIGNAL(SignalEmitter(QString)) ,a,SLOT(Respond(QString)));

should be

SIGNAL(Call(QString))

You connect a signal to a slot, i.e. Call to Respond

Upvotes: 2

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