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Build your application in debug mode (add CONFIG+=debug into your project file) and make sure you have console support turned on (in Windows you need to add CONFIG+=console to your project file). Then rerun your application. You might get a warning message then like the following one, stating what the problem is:
Object::connect: No such signal QApplication::nonexistantsignal()
You can't use values in signal-slot connections, so any of these won't work:
QTimer::singleShot( 10000, this, SLOT(doSomething(10)));
connect(checkbox, SIGNAL(stateChanged(Qt::Checked)), this, SLOT(buttonChecked()));
Instead you have to connect to a custom slot and check the value there:
connect(checkbox, SIGNAL(stateChanged(int)), this, SLOT(buttonStateChanged(int)));
//...
void someClass::buttonStateChanged(int state){
if(state==Qt::Checked)
buttonChecked();
}
You can't put parameter names (nor values) inside SIGNAL() and SLOT() macros. This won't work:
connect(tableView, SIGNAL(doubleClicked(const QModelIndex &index)),
this, SLOT(myTableView_doubleClicked(const QModelIndex &index)));
Instead you should write:
connect(tableView, SIGNAL(doubleClicked(const QModelIndex &)),
this, SLOT(myTableView_doubleClicked(const QModelIndex &)));