QT opens the print dialog box in a text editor

qt And Open the print dialog box in a text editor

QAction* actPrint;
actPrint = menu->addAction(tr("print"));
connect(actPrint, SIGNAL(triggered()), this, SLOT(doPrint()));

void MainWindow::doPrint()
{
    QTextDocument * document = ui->textEdit->document();
    QPrinter printer;
    QPrintDialog dlg(&printer, this);
    dlg.setWindowTitle(tr(" Print the document "));
    if (dlg.exec() != QDialog::Accepted) {
        return;
    }
    document->print(&printer);
}