setWindowTitle as SLOT

[Yeke]

I cannot explain myself why while this works

connect(this, SIGNAL(mysignal()), this, SLOT(showMinimized()));

this does not

connect(this, SIGNAL(mysignal()), this, SLOT(setWindowTitle("blablahblah")));

Nevertheless if I do it this way it works

connect(this, SIGNAL(mysignal()), this, SLOT(title()));
...
void MyClass::title() {
    setWindowTitle("Hola");
}

Aren't both showMinimized and setWindowTitle SLOTS of QWidget? what makes the difference?

[SGaist]

Hi and welcome to devnet,

Because you don’t pass values as parameters of the connect methods. The form you are using expect parameter types. You should also get a warning at run time.

You should take a look at Signals and Slots chapter of Qt’s documentation for more information on the subject.

[VRonin]

If you can, use Qt5 Connect Syntax

These 2 both work and are checked at compile time
connect(this, &Myclass::mysignal, this, &Myclass::showMinimized);
connect(this, &Myclass::mysignal, this, std::bind(&Myclass::setWindowTitle,this,QStringLiteral("blablahblah")));