[Qt-interest] QFileInfo returning wrong value in != operator

[Scott Aron Bloom]

Depends on how your QFileInfo was created...


-----Original Message-----
From: qt-interest-bounces+scott.bloom=onshorecs.com at qt.nokia.com [mailto:qt-interest-bounces+scott.bloom=onshorecs.com at qt.nokia.com] On Behalf Of Eric Clark
Sent: Wednesday, August 17, 2011 9:05 AM
To: Qt Interest (qt-interest at trolltech.com)
Subject: Re: [Qt-interest] QFileInfo returning wrong value in != operator



> -----Original Message-----
> From: Scott Aron Bloom [mailto:Scott.Bloom at onshorecs.com]
> Sent: Monday, August 15, 2011 9:03 PM
> To: Jason H; Eric Clark; qt-interest at trolltech.com
> Subject: RE: [Qt-interest] QFileInfo returning wrong value in != 
> operator
> 
> I have used it with success, except I check for exists.. and if it 
> doesn’t, I just compare the absolute paths directly
> 
> Which would fail in the situation where there are .. and . in the path 
> Scott

Scott,

This may have confused me a little, but doesn’t the absolute path always resolve any . or ..?

Thanks,
Eric

> 
> 
> -----Original Message-----
> From: Jason H [mailto:scorp1us at yahoo.com]
> Sent: Monday, August 15, 2011 2:02 PM
> To: Scott Aron Bloom; Eric Clark; qt-interest at trolltech.com
> Subject: Re: [Qt-interest] QFileInfo returning wrong value in != 
> operator
> 
> Should probably use a Null string and isNull() instead of isEmpty().
> 
> You want a relational database-style null, where a null is not equal 
> to all other nulls. It's probably too late to change canonicalPath to 
> return a isNull()able null string, comparing first the nulls, then 
> looking at string contents. I wonder how the self-tests fare...
> 
> But in other news, I think we have a situation where a non-existent 
> file is the same as all other non-existent files... Which does kind-of make sense.
> 
> But it seems as if QFileInfo::operator== () is pretty broken anyway.
> 
> ________________________________
> From: Scott Aron Bloom <Scott.Bloom at onshorecs.com>
> To: Eric Clark <eclark at ara.com>; qt-interest at trolltech.com
> Sent: Monday, August 15, 2011 4:43 PM
> Subject: Re: [Qt-interest] QFileInfo returning wrong value in != 
> operator
> 
> 
> I believe there is a bug on this, (or there was that I filed years 
> ago)
> 
> It stems from the fact that operator == (and !=) use (or used to) 
> canonicalPath, which returns empty string if the file does not exist
> 
> My bug suggeste it be documented that the results are unknown if the 
> files don’t exist
> 
> Scott
> 
> From:qt-interest-bounces+scott.bloom=onshorecs.com at qt.nokia.com
> [mailto:qt-interest-bounces+scott.bloom=onshorecs.com at qt.nokia.com]
> On Behalf Of Eric Clark
> Sent: Monday, August 15, 2011 12:09 PM
> To: Qt Interest (qt-interest at trolltech.com)
> Subject: [Qt-interest] QFileInfo returning wrong value in != operator
> 
> Hello All,
> 
> I am currently using Qt 4.7.1 and I am running into a problem with 
> QFileInfo. I have two instances of QFileInfo and they both point to different files.
> However, the == operator keeps saying they are the same. Here is the 
> exact paths of the two files:
> 
> 1.       C:/Users/eclark/EndgameFramework/FourStoryDemo.db
> 2.       C:/Users/eclark/EndgameFramework/test.db
> 
> The two files are clearly different. However, QFileInfo keeps saying 
> they are the same. The only thing I could see that may be a problem is 
> the fact that the files do not exist yet. Does the == operator check 
> for existence? Does anyone know why this would be happening?
> 
> Thanks in Advance!
> Eric
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> Qt-interest at qt.nokia.com
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