[Qt-interest] Problem using URL with special characters

[Atlant Schmidt]

Thiago:

  If:

    1. It's "the same mistake that everyone does" and

    2. "QUrl's ... constructor is unusable"

  It's not really "everyone's mistake"; it's a bug in Qt.

  Now if the design of QUrl can't be fixed so its constructor
  must remain unusable, maybe Qt needs to replace the construc-
  tor with the printing of an error message and an ASSERT(false)
  or some other construct that will prevent "everyone" from
  blundering into this design problem?

                                   Atlant

-----Original Message-----
From: qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com [mailto:qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com] On Behalf Of Thiago Macieira
Sent: Friday, August 26, 2011 18:38
To: qt-interest at qt.nokia.com
Subject: Re: [Qt-interest] Problem using URL with special characters

On Friday, 26 de August de 2011 16:07:26 kent williams wrote:
> 'https://predict-hd.net/xnat/REST/projects/FMRI_HD_024/subjects/0252/experim
> ents/45602/scans/2?xnat:mrScanData/parameters/addParam[name%3DReviewed]/addf
> ield=Yes'

> So I'm guessing the problem is that that the QUrl encoding is garbling
> my URL.  If I call toEncoded() I get this:
>
> https://predict-hd.net/xnat/REST/projects/FMRI_HD_024/subjects/0252/experime
> nts/45602/scans/2?xnat:mrScanData/parameters/addParam%5Bname%253DReviewed%5D
> /addfield=Yes
>
> In particular it's replacing my square brackets, and garbling the %3D
> (encoded '=')
>
> I'm new to using Qt in this way and I'm baffled as to how to get to
> NOT screw up my URL.  Any ideas?

Note that the encoding of the brackets as %5B and %5D is perfectly correct.
Focus on what's wrong: your original URL had %3D and the encoded form you
produced says %253D.

My guess is that you made the same mistake that everyone does: due to a flaw in
QUrl's design, it's constructor is unusable. Please add this to your code:

#define QT_NO_URL_CAST_FROM_STRING

And make sure you never call the QUrl constructor.

You want to use QUrl::formEncoded.

--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
   Software Architect - Intel Open Source Technology Center
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358

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