I've got an std::string content
that I know contains UTF-8 data. I want to convert it to a QString
. How do I do that, avoiding the from-ASCII conversion in Qt?
有一个名为fromUtf8
的QString
函数,它接受一个const char*
:
QString str = QString::fromUtf8(content.c_str());
QString::fromStdString(content)
is better since it is more robust. Also note, that if std::string
is encoded in UTF-8, then it should give exactly the same result as QString::fromUtf8(content.data(), int(content.size()))
.
Usually, the best way of doing the conversion is using the method fromUtf8 , but the problem is when you have strings locale-dependent.
In these cases, it's preferable to use fromLocal8Bit . Example:
std::string str = "ëxample";
QString qs = QString::fromLocal8Bit(str.c_str());
Since Qt5 fromStdString internally uses fromUtf8, so you can use both:
inline QString QString::fromStdString(const std::string& s)
{
return fromUtf8(s.data(), int(s.size()));
}
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