Qt sending signal to static slot in another class

Asked Aug 01 '17 at 13:43

Active Aug 01 '17 at 15:18

Viewed 612 times

I find these answers here, here and here, but no one can help me for my case because my slot is in another class and the answers is for static slot in the same class.
Consider this code:

class Util : public QObject
{
    Q_OBJECT
    public slots:
         static void clean(); // static

    private:
        Util(QObject *parent=0): QObject(parent){} // be always static
};

class Handler: public QObject
{
    Q_OBJECT
    public:
       Handler(QObject *parent=0): QObject(parent){}
    signals:
        void cleanup();
};

and MainWindow function connectSignal();

void MainWdindow::connectSignal()
{
    Handler *handler = new Handler();
   connect(handler, SIGNAL(cleanup), &Util::clean) // compile error 
}

the error is:

 no matching function for call MainWindow::connect(Handler*&, const char*, void(*)())
....
note: cannot convert Util::clean(type void(*)()) to type const QObject*

any help is appreciated. Thanks

UPDATE
Solved, solution in the comments

edited Aug 01 '17 at 15:18

asked Aug 01 '17 at 13:43

Phiber

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qt 5.6, windows && Linux – Phiber Aug 01 '17 at 13:45
3

`connect(handler, &Handler::cleanup, &Util::clean)` should work with sufficiently recent Qt version. – Igor Tandetnik Aug 01 '17 at 13:45
6

`connect(handler, SIGNAL(cleanup), &Util::clean)` looks like you mixed Qt4 and Qt5 signal connection style, Try this instead: `QObject::connect(handler, &Handler::cleanup, &Util::clean);`. – Scheff's Cat Aug 01 '17 at 13:45
@Igor Tandetnik It works !, thank you. One of you put this as answer to be accepted. – Phiber Aug 01 '17 at 14:07
@Scheff see above – Phiber Aug 01 '17 at 14:07
@Phiber https://stackoverflow.com/questions/45251898/qt-multithreading-how-to-update-two-qlabels/45251994#45251994 – Farhad Aug 01 '17 at 14:14

Qt sending signal to static slot in another class

0 Answers0