c++ - QObject connection function

Question

I checked other similar questions and tried their solutions but they don't work for me.

I'm basically trying to make a http client that only makes post requests. In order to do this, I need to connect QNetworkManager's finished signal to some callback slot.

Here's my code.

h file:

...
public slots:
   void finishedSlot(QNetworkReply* reply);
private:
    QNetworkAccessManager *network_manager;
...

cpp file:

...
Class1::Class1(){
    network_manager = new QNetworkAccessManager(this);
    QObject::connect(network_manager, SIGNAL(finished(QNetworkReply *)), this, SLOT(finishedSlot(QNetworkReply *)));
}
...
void Class1::finishedSlot(QNetworkReply* reply)
{
    // some logic with reply
}
...

As you can see, the slot is definitely present and it is declared under public slots in header file. So I have no idea why this is happening. I already tried clean, run qmake, and rebuild.

The error message is:

"QObject::connect: No such slot QObject::finishedSlot(QNetworkReply *)"

Any idea?

Answer 1

You probably forgot to use the Q_OBJECT macro. Every class that implements its own slots/signals needs that macro. Don't forget that you need to add your header/source file to the .pro file.