Qt and error handling strategy
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.
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, 开发者_运维知识库I can refuse to use exceptions in my code and switch to some other strategy.
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?
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;
Throwing exceptions out of an event handler is not supported in Qt. Avoid that, and there should not be any problem with exceptions.
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