QLocale::system().script() always returning 0 on Windows

djtrifun

I am trying to distinguish between Serbian Latin and Serbian Cyrillic locales on Windows, but QLocale::system().script() seem to always return 0 (QLocale::Script::AnyScript).

I tried on Windows 7 and Windows 8.1, with Qt 5.4.2 as well as Qt 4.8.5, always with the same result. I also tried with other multi-script languages, but I never got anything other than QLocale::Script::AnyScript.

Is this a bug, or am I doing something wrong? Haven't found a matching QTBUG so far.

Also, the documentation for QLocale::bcp47Name() states that it "returns the dash-separated language, script and country (and possibly other BCP47 fields) of this locale as a string": http://qt-project.org/doc/qt-5.0/qtcore/qlocale.html#bcp47Name
However, for both Serbain (Cyrillic, Serbia) and Serbian (Latin, Serbia) I get "sr-RS" (with Qt 4.8.5) or just "sr" (with Qt 5.4.2, due to an already reported regression https://bugreports.qt.io/browse/QTBUG-34872). I never get the script in the result string.

As a result, I couldn't find a regular way to distinguish between these locales. A possible workaround may be to examine the QLocale::system().nativeLanguageName(), but that's a very ugly hack that doesn't provide the solution for the general case, and I would rather avoid it if possible.

Thanks in advance for any help with this.

SGaist

Hi and welcome to devnet,

Seems like there's indeed something going on. What results should you have exactly ?

djtrifun

Hello SGaist,

Thanks for your response. I expect for Serbian (Cyrillic, Serbia) to get:

2 (QLocale::Script::CyrillicScript) from QLocale::system().script(), and
"sr-Cyrl-RS" from QLocale::system().bcp47Name().

Similarly, for Serbian (Latin, Serbia) I expect:

7 (QLocale::Script::LatinScript) from QLocale::system().script(), and
"sr-Latn-RS" from QLocale::system().bcp47Name().

Should I open new bugs for script() and bcp47Name()?

This is the workaround I made for bcp47Name:

QString bcp47Name;

#ifdef Q_OS_WIN
wchar_t buffer[LOCALE_NAME_MAX_LENGTH];
::GetUserDefaultLocaleName(buffer, LOCALE_NAME_MAX_LENGTH);
bcp47Name = QString::fromWCharArray(buffer);
#else
bcp47Name = QLocale::system().bcp47Name();
#endif

But didn't have a chance to try it on non-Windows platforms yet.

Thanks!