[solved] Object::connect: No such slot

deleted28

I modified the example "Configuration Dialog" (from Qt 4.8/ creator2.8)
for learning by doing. On a QPushbutton clicked event on one of the pages
of a QStackedWidget a short message should be printed out.
I'm not able to set the connect SIGNAL correctly. What is wrong here ?
@class TestPage : public QWidget
{
public:
TestPage(QWidget *parent = 0);

private:
QPushButton *pb_1 ;
QPushButton *pb_2 ;
QPushButton *pb_go;

private slots:
void xxx();

};@

@TestPage::TestPage(QWidget *parent)
: QWidget(parent)
{

QGroupBox *gb_avalPorts = new QGroupBox("Availabe ports");

pb_1 = new QPushButton("1");
pb_2 = new QPushButton("2");

QVBoxLayout *sniffLayout = new QVBoxLayout;
sniffLayout->addWidget(pb_1);
sniffLayout->addWidget(pb_2);
gb_avalPorts->setLayout(sniffLayout);

pb_go = new QPushButton("Go");

QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addWidget(gb_avalPorts);
mainLayout->addWidget(pb_go);
mainLayout->addSpacing(12);

// mainLayout->addStretch(1);
setLayout(mainLayout);

connect(pb_go, SIGNAL(clicked()), this, SLOT(xxx()));

}

void TestPage::xxx()
{
qDebug() << "bingo";

}
@

immediately on startup i get message:
Object::connect: No such slot QWidget::xxx()

SGaist

Hi,

You are missing the Q_OBJECT macro in your class declaration

deleted28

Never would find this without your hint, thx.
but now:
pages.cpp:-1: error: undefined reference to `vtable for TestPage'

i just addes line 3

@class TestPage : public QWidget
{
Q_OBJECT

public:
TestPage(QWidget *parent = 0);

private:
QPushButton *pb_1 ;
QPushButton *pb_2 ;
QPushButton *pb_go;

private slots:
void xxx();

};@

SGaist

You need to run qmake when you add/remove the Q_OBJECT macro before building

koahnig

Probably a good idea to "rerun qmake" and "rebuild".

deleted28

Yup ! Great ! Thank you !