Convert CFStringRef to QString

cross platform c++ header file. separate c++ file for each platform: windows, linux, mac. Deals with platform specific implementation of enumerating windows.

on the mac side: I have a CFStringRef populated. the header file defines a QString object. I need to pass the contents of the CFStringRef to the QString.

How can this be achieved?

This is the static function used internally by Qt (from src/corelib/kernel/qcore_mac.cpp):

QString QCFString::toQString(CFStringRef str)
{
    if (!str)
        return QString();

    CFIndex length = CFStringGetLength(str);
    if (length == 0)
        return QString();

    QString string(length, Qt::Uninitialized);
    CFStringGetCharacters(str, CFRangeMake(0, length), reinterpret_cast<UniChar *> 
        (const_cast<QChar *>(string.unicode())));
    return string;
}

Update (2020): nowadays use QString::fromCFString() as @ehopperdietzel suggested in his answer.