dockwidget 显示与隐藏
QDockWidget * dock2 = new QDockWidget(this);
QDockWidget * myWidget2 = new QDockWidget;
dock2->setWidget(myWidget2);
this->addDockWidget(Qt::LeftDockWidgetArea, dock2);
QPushButton* btn = new QPushButton(this);
btn->setText(tr("something"));
btn->move(600, 600);
btn->show();
connect(btn,&QAction::triggered,this,dock2->hide());
最后一行报错: error: invalid use of void expression
connect(btn,&QAction::triggered,this,dock2->hide())
求大神指点!!!!