Qt-QBasicTimer can only be used with threads started with QThread原因探究

项目中遇到这样一个bug,程序关闭后,终端报warning:

QBasicTimer can only be used with threads started with QThread

查找资料后发现,报错的原因很可能是因为使用了static QObject造成的,在这篇文章中我已经提到过,我们不应该使用static的QObject,该篇文章中的引用1提到:

In general, creating QObjects before the QApplication is not supported and can lead to weird crashes on exit, depending on the platform. This means static instances of QObject are also not supported. A properly structured single or multi-threaded application should make the QApplication be the first created, and last destroyed QObject.

在项目中检查发现确实使用了一个static的QDialog,并且ui包含combobox的时候退出时会打印warning,如果没有combobox则不会。
在这个贴子中,提问者的现象和我一致,猜测的原因是QObject和QApplication的析构顺序造成的。
综上,解决方法就是不要使用static QObject,不论是否有报warning,否则可能出现各种奇怪的问题

引用:

  1. https://forum.qt.io/topic/143202/weird-connection-between-qcombobox-qbasictimer-and-static-object-initialization/2
  2. https://blog.csdn.net/mrbone11/article/details/123406432

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