qt的ftp系统qurl问题

Question

mainwindow.cpp:523:37: error: incomplete type ‘QUrl’ used in nested name specifier
     QDesktopServices::openUrl(QUrl::fromLocalFile("/home/主目录/文档"));

代码：

void MainWindow::on_pushButton_2_clicked()
{
    QDesktopServices::openUrl(QUrl::fromLocalFile("/home/主目录/文档"));

}

Answer 1

C和C++完整教程：https://blog.csdn.net/it_xiangqiang/category_10581430.html
C和C++算法完整教程：https://blog.csdn.net/it_xiangqiang/category_10768339.html