Qt-interest Archive, March 2007
QObject connect trouble
Message 1 in thread
Hello,
I think I'm missing something with the 'connect' thing between two classes.
I have an UI form, in which I have some code :
class BoardWindow : public QMainWindow, public Ui::BoardWindow
{
Q_OBJECT
...
Myclass *myclass;
}
BoardWindow::BoardWindow( QWidget *parent , Qt::WindowFlags flags )
: QMainWindow( parent, flags )
{
myclass = new Myclass(this);
connect(ui.myButton,SIGNAL(pressed()), myclass, SLOT(slotMyAction()));
...
}
And I have my working class
class Myclass : public QObject
{
// Q_OBJECT
public:
Myclass(BoardWindow *bw);
~Myclass();
public slots:
void slotMyAction();
...
}
This code does not work, because at run time I get an error :
Object::connect: No such slot QObject::slotMyAction()
Object::connect: (sender name: 'myButton')
I have tried to uncomment the Q_OBJECT in Myclass definition, but the
compile produces errors at linking step :
Myclass.o : in the function "Myclass"
myclass.cpp : xx undefined reference to "vtable for Myclass"
Myclass.o : in the function "~Myclass"
myclass.cpp : yy undefined reference to "vtable for Myclass"
What am I missing ?
Thanks in advance
--
[ signature omitted ]
Message 2 in thread
eb schrieb:
> Hello,
>
> I think I'm missing something with the 'connect' thing between two classes.
>
> I have an UI form, in which I have some code :
>
> class BoardWindow : public QMainWindow, public Ui::BoardWindow
> {
> Q_OBJECT
> ...
> Myclass *myclass;
> }
>
> BoardWindow::BoardWindow( QWidget *parent , Qt::WindowFlags flags )
> : QMainWindow( parent, flags )
> {
> myclass = new Myclass(this);
> connect(ui.myButton,SIGNAL(pressed()), myclass, SLOT(slotMyAction()));
> ...
> }
>
>
> And I have my working class
>
> class Myclass : public QObject
> {
> // Q_OBJECT
> public:
> Myclass(BoardWindow *bw);
> ~Myclass();
>
> public slots:
> void slotMyAction();
> ...
>
> }
>
> This code does not work, because at run time I get an error :
> Object::connect: No such slot QObject::slotMyAction()
> Object::connect: (sender name: 'myButton')
>
>
>
> I have tried to uncomment the Q_OBJECT in Myclass definition, but the
> compile produces errors at linking step :
> Myclass.o : in the function "Myclass"
> myclass.cpp : xx undefined reference to "vtable for Myclass"
> Myclass.o : in the function "~Myclass"
> myclass.cpp : yy undefined reference to "vtable for Myclass"
>
>
> What am I missing ?
A qmake run after you added Q_OBJECT
Christian Ehrlicher
--
[ signature omitted ]
Message 3 in thread
Christian Ehrlicher wrote:
> A qmake run after you added Q_OBJECT
>
> Christian Ehrliche
Yes, it worked.
Thanks
--
[ signature omitted ]
