On quinta-feira, 24 de janeiro de 2013 14.51.24, Joshua Grauman wrote:
> Sorry for all the emails, but I finally tracked it down.
> QTextCodec::codecForName("UTF-8") is returning 0 because I call it before
> QApplication is initialized. I'm not sure if this is expected behavior or
> not. In any case, on the other platforms it's not a problem.
It's definitely a bug. Please remember that most Qt API is not supported before
the QCoreApplication object is initialized, so this bug will have a low
priority of fixing.
> But where there is definitely a bug in Qt is that
> QTextCodec::codecForName("UTF-8") caches the results, even when it returns
> 0. So my early call of QTextCodec::codecForName("UTF-8") gets a 0 cached
> for UTF-8, which then later causes QTextStream::readLine() to crash when
> it calls QTextCodec::codecForName("UTF-8"). So looking at the Qt code, an
> extra condition should be added to make sure null pointers aren't cached
> in the QTextCodec::codecForName() function. Thanks!
Indeed. The ICU-based codec system has a cache.
However, at first glance, I don't see anything that would cause the lookup to
fail before QCoreApplication.
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
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