Qt - Connected but doesn't work

Question

I have problem with one class in my project, after click appears new window with QTableWidget and QPushButton, after clicking the button I should have "test" on stdout, but nothing shows, here are parts of this code:

Header:

class ClientsSelector : public QWidget {
Q_OBJECT

public:
ClientsSelector(InvoiceTab* parent);
QWidget *window;

private:
QPushButton *accept;

public slots:
void loadData();

Constructor:

window = new QWidget();
layout = new QGridLayout();
layout->addWidget(table, 0, 0);

/*code*/

accept = new QPushButton(QString::fromUtf8("Load data"));
connect(accept, SIGNAL(clicked()), this, SLOT(loadData()));
layout->addWidget(accept, 0, 1);

/*code*/

window->setLayout(layout);

window->show();

Method:

void ClientsSelector::loadData() {

QTextStream std(stdout);
std << "test" << endl;

}

I have not even one warning nor error. I have nothing on stdout, it looks like button was connected to wrong object(?)

Answer 1

How do you instantiate ClientsSelector? Isn't it a singleton or global variable by chance? Try moving the connect call to a separate init function which is called after the ClientsSelector constructor. It helped me in similar WTF situations. It has something to do with the fact that each QObject inheritor has a static metadata member and you can't be sure about when it is fully initialized until the constructor finishes. connect won't work without that metadata.

See for example here: http://www.qtcentre.org/threads/9479-connect-in-constructor

If still lost, go through this checklist. Qt signals are so easy to use, everybody sometimes forgets it also has some requirements.