c++ - How to get which QradioButton invoke the SLOT -

i create several qradiobutton , connect same slot. in slot, want know qradiobutton invoke slot , related action. found there way using qobject_cast , qobject::sender(), seems not work. here code:

header file:

class dialoginput : public qdialog {     q_object  public:     dialoginput(qwidget *parent = 0);     qradiobutton *radio1;     qradiobutton *radio2;     qradiobutton *radio3; private slots:     void settext_2(); private:     qlabel *label_0_0;     qlabel *label_1; }; 

main file:

dialoginput::dialoginput(qwidget *parent): qdialog(parent){      label_0_0 = new qlabel("label_1:");     label_1 = new qlabel;        qwidget *window = new qwidget;     qvboxlayout *windowlayout = new qvboxlayout;      qgroupbox *box = new qgroupbox("display type");     radio1 = new qradiobutton("3");     radio2 = new qradiobutton("5");     radio3 = new qradiobutton("9");     qvboxlayout *radiolayout = new qvboxlayout;      connect(radio1,signal(clicked()),this,slot(settext_2()));     connect(radio2,signal(clicked()),this,slot(settext_2()));     connect(radio3,signal(clicked()),this,slot(settext_2()));      radiolayout->addwidget(radio1);     radiolayout->addwidget(radio2);     radiolayout->addwidget(radio3);      box->setlayout(radiolayout);      windowlayout->addwidget(box);     windowlayout->addwidget(label_0_0);     windowlayout->addwidget(label_1);      window->setlayout(windowlayout);     window->show();  } void dialoginput::settext_2(){      qobject *object = qobject::sender();     qradiobutton* pbtn = qobject_cast<qradiobutton*>(object);     qstring name = pbtn->objectname();      label_1->settext(name);      if(!qstring::compare(name, "3")){            }     else if(!qstring::compare(name, "5")){     }     else if(!qstring::compare(name, "9")){     }  } int main(int argc, char *argv[]) {     qapplication a(argc, argv);      dialoginput *input = new dialoginput();      return a.exec(); } 

you create separate wrapper slots each radio button, passes information function want call. this: -

class dialoginput : public qdialog {     q_object  public:     qradiobutton *radio1;     qradiobutton *radio2;     qradiobutton *radio3;  private slots:    void radio1selected() { settext_2(1); }    void radio2selected() { settext_2(2); }    void radio3selected() { settext_2(3); }  private:    void settext_2(int id); 

};

then connect each radio button: -

connect(radio1,signal(clicked()),this,slot(radio1selected())); connect(radio2,signal(clicked()),this,slot(radio2selected())); connect(radio3,signal(clicked()),this,slot(radio3selected())); 

now when settext_2 called, id represent selected radio button.