What means this error and how can i fix it?

[A Former User]

Hello,
what means this error and how can i fix it?

C:\Users\henri\Documents\Kodi\Kodi\main.cpp:242: Fehler: could not convert 'fullScreen->QPushButton::<anonymous>.QAbstractButton::click()' from 'void' to 'bool'
         if(fullScreen->click ())
                              ^

Hallo,
was bedeutet dieser Fehler und wie kann ich ihn beheben?

C:\Users\henri\Documents\Kodi\Kodi\main.cpp:242: Fehler: could not convert 'fullScreen->QPushButton::<anonymous>.QAbstractButton::click()' from 'void' to 'bool'
         if(fullScreen->click ())
                              ^

Complete Code snippet:
Kompletter Code-Ausschnitt:

QPushButton *fullScreen = new QPushButton;
        fullScreen->setText ("[ ]");
        fullScreen->resize (15, 15);
        if(fullScreen->click ())
            container->setMinimumSize(QSize(screenSize.width() / 1, screenSize.height() / 1));

Thanks for help,
danke,

Henrik

[A Former User]

Hi! It's declared as void QAbstractButton::click(), so it does not return any value (void) but your if (something) requires something to return a value that is of type bool or that can be implicitely converted to bool.

[mrjj]

Besides @Wieland explanation why it dont work, i would like to add the following

You can never check for a button being clicked using a function like that.
" if(fullScreen->click ())"

You would always need to connect
connect(button, SIGNAL( clicked() ) , this, SLOT( yourslot))
and then in the function yourslot do what you want.

Howver, if u have c++11 enabled , you can cheat a little using something
called lambda, which allows to define the slot locally.

like this

 connect(loadTextFileButton, &QPushButton::clicked, []()
 {
     qDebug()<<"clicked";
 });

[A Former User]

Thanks,

when i copy and paste your Code:

connect(fullScreen, &QPushButton::clicked, 
{
qDebug()<<"clicked";
});

I geht this:
error: expected '}'
note: to match this '{'

And the ; behind "clicked" is red underlined...

[mrjj]

@HenrikSt.

hi if you are using mingw compiler, make sure it
has
config+=c++11

in the pro file.

This enable c++ 11 and that is needed for this syntax.

[A Former User]

I have it:
CONFIG += c++11

[A Former User]

But the error is still there

[mrjj]

oh forum ate some of the syntax

 connect(loadTextFileButton, &QPushButton::clicked, []()
 {
     qDebug()<<"clicked";
 });

note the []

it removed it before.

[A Former User]

It works,

thanks a lot