C ++应用程序在退出时不会终止所有进程 [英] C++ application does not kill all processes on exit

问题描述

这是我的main.cpp，它启动mainwindow：

This is my main.cpp which starts the mainwindow:

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    TabWindow w;
    w.show();
    return a.exec();
}

即使使用 a.connect ）我不明白为什么myApplication.exe仍然运行后，我关闭mainwindow。 有关点击退出按钮后，如何完全结束所有流程的任何建议？

Even with the a.connect(...) I do not understand why myApplication.exe still runs after I close the mainwindow. Any suggestions on how I can fully end all processes after the quit button is clicked?

编辑 a href =http://qt-project.org/doc/qt-5/qguiapplication.html#exec =nofollow> Qt文档说：
我们建议您连接清除代码到aboutToQuit（）信号，而不是将它放在应用程序的main（）函数中。这是因为在一些平台上，QApplication :: exec（）调用可能不会返回。

The Qt Documentation says this: We recommend that you connect clean-up code to the aboutToQuit() signal, instead of putting it in your application's main() function. This is because, on some platforms, the QApplication::exec() call may not return.

推荐答案

在 @ratchetfreak 在我的问题，我想出了问题在哪里。

Thanks to the comment posted by @ratchetfreak in my question, I figured out where the problem was.

在我的MainWindow中，我开始未终止的工作线程，因此在应用程序关闭后仍然保存为进程。为了解决这个问题，我注册了关闭事件并且跟踪线程的存在 - 即基本上忽略了closeEvent，直到线程也被删除。

In my MainWindow, I started a worker thread which was not terminated and thus still persisted as a process after the application was closed. In order to fix this, I registered the close event and kept track of the existence of the thread - i.e. basically, ignored the closeEvent until the thread was deleted as well.

void MainWindow::closeEvent(QCloseEvent *event)
{
    if (workerThreadExists) {
        // Gracefully exiting all tasks inside the worker thread
        while (workerThreadExists){
            event->ignore();
        }
        event->accept();

    }
}

code> workerThreadExists 只是一个 BOOLEAN ，一旦创建线程设置为true，然后当线程设置为false被删除。希望这有助于！

...and for me workerThreadExists is just a BOOLEAN that is set to true once the thread is created and then it is set to false when the thread is deleted. Hope this helps!

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