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List: kde-core-devel
Subject: Re: Qt 4.8 QUrl.toLocalFile behavior change,
From: Thiago Macieira <thiago () kde ! org>
Date: 2011-10-29 7:25:03
Message-ID: 2906091.yU3oNfbFMX () doriath
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On Saturday, 29 de October de 2011 04:38:00 Milian Wolff wrote:
> 1) When does it manifest? Apparently when using QUrl("...") directly, if I'm
> not mistaken. But what if we use KUrl?
You're correct: this problem manifests when you use QUrl's constructor
directly, assuming it will understand a local file path for what it is and not
parse it is a URL. KUrl's constructor calls fromPathOrUrl, so it will try to
guess according to some heuristics.
The reason why this behaviour exists in QUrl and why I think KUrl is flawed is
that there's a category of URLs that are incomplete, the relative URLs, also
known as URL refs. That's what you see in the "href" or "src" attributes in
HTML: those are real URL components, but they are partial. They need to be
resolved against a base URL, usually the document's.
There's no way to tell apart a local file path from a URL ref and the examples
I gave show how it would be interpreted differently.
> 2) Is the -D... define to catch this problem at compile time already
> supported in Qt 4.7?
Yes.
Note it just makes the constructor explicit: it's meant to catch accidental
conversions. If you spell out QUrl, it will still get used.
--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
Software Architect - Intel Open Source Technology Center
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