005 如何获取QlineEdit/QtextEdit上的文本？如何输出文本到文件？

QString str = m_timeLineEdit->text();

QDateTime time = QDateTime::currentDateTime();
QString str = time.toString("yyyy-MM-dd");
QFile data(str+".txt");
if(data.open(QFile::WriteOnly | QFile::Truncate))
{
    QTextStream out(&data);
    out<toPlainText();
}
data.close();