CODEWITHSUNDEEP
c++qtargumentsqt5signals-slots
albert
albert

Reputation: 1816

How to pass more than one argument to SLOT function in qt5?

As a sample, i have a function 

void MyClass::foo( int i, int j ){ cout << i+j; }

and i wish that one signal execute a slot on some function of the class

connect( Object, SIGNAL( mysignal() ), SLOT( this->foo(1,2) ) );

With one argument its work, but show errors with 2 or more arguments on slot.

Upvotes: 1

Views: 3143

Answers (2)

parsley72
parsley72

Reputation: 9037

Note that in Qt5 you can use the new signal/slot syntax and write this:

connect( pointerToObjectEmittingTheSignal, &MyClass::my_signal, 
         this, &MyOtherClass::my_slot);

the advantage being that if you make a mistake you'll get a compile-time error instead of a runtime error.

Upvotes: 3

Alexey
Alexey

Reputation: 5978

QT has excellent documentation on signals and slots http://qt-project.org/doc/qt-5/signalsandslots.html, make sure you understand the syntax. In your case it will be something like 

connect( pointerToObjectEmittingTheSignal, SIGNAL(my_signal(int, int) ), 
         this, SLOT(my_slot(int, int));

In addition, your signal declaration should take two arguments of type int and int

signals:
     void my_signal(int, int);

Upvotes: 4

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