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")));