Object::connect: No such slot 问题解决办法- QT

Qt 信号和槽异常： QObject::connect: No Such slot baseClassName qobject__connect_ no such slot Не обнаружен слот, уже несколько часов гуглю, не могу решить проблему QObject::connect: No such slot QMainWindow::open() in hand slot If block is true, signals emitted by this object are blocked If block is false, no such

how to bet on slot machines Object::connect: No such slot QComboBox::setCurrentItem Since QObject::connect(item2, SIGNAL(clicked()), signalMapper, SLOT