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class ring:public QObject{

    Q_OBJECT

private:
    int hour;
    int minute;
    QString ring_name;

public:
    ring(){
        hour=0;
        minute=0;
        ring_name="SomeName";
    }
public slots:
    void change_all_slot(int h, int m){
        hour=h;
        minute=m;
    }
};

ring *n1=new ring();
QTextEdit *name_edit=new QTextEdit();
QTimeEdit *time_edit=new QTimeEdit();
QPushButton *save_button=new QPushButton(QString::fromLocal8Bit("Сохранить"));
QTime s=time_edit->time();
QObject::connect(save_button,SIGNAL(clicked()),n1,SLOT(change_all_slot(s.hour(),s.minute())));

Object::connect: No such slot ring::change_all_slot(s.hour(),s.minute()) in ..\intime\main.cpp:49

QObject::connect(save_button,SIGNAL(clicked()),this,SLOT(change_all_slot()));
////////////////////////
public slots:
    void change_all_slot(){
        n1->hour = time_edit->time().hour();
        n1->minute = time_edit->time().minute();
    }
};