[Fedora-trans-ar] RE: Arabic issue #32: The conversion of a localized 'const QString' to 'double' returns 0
Right. The problem is occurring when going from const char * to QString, not when going
from QString to int (which is properly locale dependent when using QLocale::toDouble).
comma is in latin-1, so there's no problem. ١٢٣ is not latin-1, so won't transcode
it to utf16 correctly unless it's been told to do something else.
And yes, I suspect the reason for latin1 as the standard 8bit codec is performance:
latin-1 is identical to the first 256 code points of utf16, so the processing required to
'cast' 8bit const char * to utf16 QString this way is thus minimized.
QString::from* methods are provided for several other common codecs (utf8 among them) to
make it easy to be explicit (and there's the QT_NO_CAST_ASCII macros to force you to
always be explicit), and QTextCodec for all the rest.
-----Original Message-----
From: Munzir Taha [mailto:munzirtaha@newhorizons.com.sa]
Sent: Saturday, May 07, 2005 2:59 PM
To: qt4-preview-feedback(a)trolltech.com
Cc: Puetz Kevin A; fedora-trans-ar(a)redhat.com
Subject: Re: Arabic issue #32: The conversion of a localized
'const QString' to 'double' returns 0
On Yaum al-Sabt 28 Rabi` al-Awal 1426 01:54, you wrote:
> I would say that depends on whether or not you've called
> QTextCodec::setCodecForCStrings() to tell it bare const char * and
> QByteArray should be interpreted as utf-8 (I believe the default is
> latin-1, but I'd probably be explicit if I was using anything other
> than ascii).
Thanks a lot Puetz for your reply but what's confusing me is if I can
QLocale::setDefault(QLocale::German);
d = QString( "1234,56" ).toDouble(&ok); // ok == true, d
== 1234.56 without calling QTextCodec::setCodecForCStrings()
or trUtf8, why not for QLocale::Arabic? Is this because the
German comma is within ascii range? Is this justified? Is it
for performance reasons that the default is latin-1 and not utf8?
> > > QLocale ar(QLocale::Arabic);
> > > double d = ar.toDouble( "١٢٣" );
> > Now I found if I do it like this:
> > d = arabic.toDouble(QObject::trUtf8("١٢٣"));
> >
> > It works! Should I consider this bug as invalid?
--
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