Qt和错误处理策略 [英] Qt and error handling strategy

问题描述

其实，我明白使用例外的主要优点和缺点。我在我的项目中默认使用它们作为错误处理策略。
但现在我开始一个Windows CE项目与Qt库，我看到Qt的创建者拒绝使用类层次结构中的异常。

Actually, I do understand major pros and cons of using exceptions. And I use them in my projects by default as error-handling strategy. But now I'm starting a Windows CE project with Qt library, and I see that Qt creators refused to use exceptions in the class hierarchy.

如果我使用异常，我需要仔细翻译他们/从错误代码（或一些对象，或只是吞下）在我/ Qt代码界限。否则，我可以拒绝在我的代码中使用异常并切换到其他策略。

So, if I use exceptions I will need to carefully translate them to and from error codes (or some objects, or just swallow) on my/Qt code bounds. Otherwise, I can refuse to use exceptions in my code and switch to some other strategy.

在我的情况下，最好的错误处理策略 - 使用异常或使用错误代码，等等...？
你有Qt开发的经验和你使用什么错误处理策略？

What would be the best error handling strategy in my case - to use exceptions or to use error-codes, or etc...? Do you have experience with Qt development and what error handling strategy did you use?

推荐答案

覆盖QApplication :: notify（）并处理异常（不是100％的返回值）。您可以从信号处理程序抛出异常，但不会以这种方式传播到Qt。

Override QApplication::notify() and handle exceptions there (not 100% on the return value). You can "throw" exceptions from signal handlers but they don't get propagated to Qt in this way.

bool
notify(QObject * rec, QEvent * ev)
{
  try
  {
    return QApplication::notify(rec,ev);
  }
  catch(my::Exception & e)
  {
    QMessageBox::warning(0,
                         tr("An error occurred"),
                         e.message());
  }
  catch(...)
  {
    QMessageBox::warning(0,
                         tr("An unexpected error occurred"),
                         tr("This is likely a bug."));
  }
  return false;

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