Question

我尝试创建一个Qt application。使用Valgrind时，我发现有QMenu引起的内存泄漏。无法确切地弄清楚这一点。我确实尝试遵循QT example for QTMenu class，但即使这样做也会导致泄漏。 Valgrind在addMenu调用中通知泄漏发生在这里：

void MainWindow::createMenu()
{
    //Create menus
    QAction *quit = new QAction("&Quit", this);
    QMenu *file = menuBar()->addMenu("&File");
    file->addAction(quit);
    connect(quit, &QAction::triggered,
    [=]() {
        QApplication::quit();
    });

    //Creating instances of ticker and timer here
    //Done so that the connection between ticker and timer is possible
    ticker = new Ticker(this);
    timer = new Timer(this);
    connect(timer, &Timer::timeout, ticker, &Ticker::playSound);
}

这恰好是Valgrind日志

The leaks happen with 78 (32 direct, 46 indirect) bytes in 1 blocks are definitely lost in loss record 11,297 of 16,371
  in MainWindow::createMenu() in /home/user/Documents/C/QT/Metronome/MainWindow.cpp:47
  1: operator new(unsigned long) in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so
  2: 0x1630a434
  3: /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  4: QMainWindow::menuBar() const in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.5.1
  5: MainWindow::createMenu() in /home/user/Documents/C/QT/Metronome/MainWindow.cpp:47
  6: MainWindow::setMainWindow() in /home/user/Documents/C/QT/Metronome/MainWindow.cpp:20
  7: MainWindow::MainWindow(QWidget*) in /home/user/Documents/C/QT/Metronome/MainWindow.cpp:6
  8: main in /home/user/Documents/C/QT/Metronome/main.cpp:22

所以我的问题是，如何布置菜单以避免内存泄漏？顺便说一句，删除QAction，QMenu部分不会导致泄漏。

Answer 1

在main()函数中执行此操作有助于解决此问题：

MainWindow *window = new MainWindow();

QMenu的内存泄漏

1 个答案: