No matching function for QObject::connect

Question

I\'m writing a program that send an UDP frame every 10 mS. Here\'s how my program is supposed to work :

I\'ve got a client class :

//Con         


        

Answer 1

There can be several reasons for the issue in general:

• You do not inherit QObject.

• You do not have the Q_OBJECT macro in your class.

• You do not define the method as slot in your header file where the class is declared.

Your issue is the first which can be seen here:

class clientSupervision

You should change your code to:

class clientSupervision : public QObject
//                      ^^^^^^^^^^^^^^^^

Of course, the constructor implementation and signature would need to change, too, as follows:

explicit clientSupervision(QObject *parent = Q_NULL_PTR) : QObject(parent) { ... }

In addition, you seem to leak your QTimer instance as it does not get the parent as a parameter to the constructor.

Furthermore, the QObject:: scope is needless in your code as your class ought to inherit QObject directly or indirectly either way.

Even more, I would highly encourage you to utilize the new signal-slot syntax.