[Qt-interest] QFtp put functions has a bug?

[Thiago Macieira]

Em Quarta-feira 11 Fevereiro 2009, às 16:28:45, Pavel Koshevoy escreveu:
> Thiago Macieira wrote:
> > tank wrote:
> >> Thiago Macieira 写道:
> >>> QFtp only supports Latin1.
> >>
> >> i want to know
> >>    how to put a file that's name is chinese ???
> >
> > You can't. QFtp is limited to Latin 1.
>
> That's broken. Is there a technical reason for this?

Yes: all commands are queued in QFtp using a QStringList. It sends them one by 
one and checks that they were successful.

However, since they are stored in a QStringList, QFtp has to know which 
encoding to use. The code just assumes it's Latin 1 and has no way of changing 
it.

Also note that the Qt API uses QString for filenames, meaning it always has to 
convert to the 8-bit locale format when operating with files on Unix platforms. 
When dealing with remote servers, however, you can't assume the locale 
encoding is valid.

QFtp therefore needs a new feature to specify which codec to use for remote 
filenames.

> Will QFtp support
> international file names (QString or UTF-8 std::string) in the future?

No, it will not. We're not adding any new features to QFtp anymore.

Instead, we may add that feature to QNetworkAccessManager. In fact, it should 
be considered a bug in it: since it operates on URLs, the IRI specification 
(RFC 3987) applies. That means URLs are always encoded in UTF-8. The failure 
to use UTF-8 in file names is a bug (because we use QFtp behind the scenes).

However, URLs can hold arbitrary binary data in the path: if your remote 
server uses an encoding different from UTF-8, you can encode it with percent-
encoding in the URL. For example, the file "中国.txt" would be encoded as:

	ftp://someserver/path/%d6%d0%b9%fa.txt

in GB2312.
-- 
Thiago Macieira - thiago.macieira (AT) nokia.com
  Senior Product Manager - Nokia, Qt Software
     Sandakerveien 116, NO-0402 Oslo, Norway
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