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MainWindow::MainWindow(QWidget *parent):
QMainWindow(parent)
{
setWindowTitle(tr("Main Window"));
openAction=new QAction(QIcon(":/images/doc-open"),tr("&open..."),this);
openAction->setShortcuts(QKeySequence::Open);
openAction->setStatusTip(tr("Open an existing file"));
connect(openAction,&QAction::triggered,this,&MainWindow::open);
QMenu *file=menuBar()->addMenu(tr("&File"));
file->addAction(openAction);
QToolBar *toolBar=addToolBar(tr("&File"));
toolBar->addAction(openAction);
QStatusBar *statusBar = statusBar();(问题出在这行)
statusBar->addAction(openAction);
}