[Qt-interest] Qt with x64 computer

[Ian Thomson]

Hi,

Qt's classes sometimes use other Qt classes internally. If you did not 
specifically use a QHash then this will be the reason why it crashes 
there anyway.

Your code is no use to me. In fact you said that the application crashes 
in loadParameters and that loadParameters executes OK. I don't know what 
the loadParameters function is or what type the variable 'reg' is. Also, 
I don't know what pressing F11 does for you.

What I suggest you do is create a minimal example that does the same 
thing you're trying to do which causes your crash. Usually doing that is 
enough to highlight the problem, or if not, it will be easy for other 
people to discuss.

Cheers,
Ian.


P B wrote:
> Hi Ian,
>  
> I'm confused as to where the error stands in my code, I traced it up to 
> this. The application crashes at loadParameters(...) in the following code
>  
> ______________________________________________________
>    loadParamFile(const char *filename)
>    {
>      QString loadfile = QString(filename);
>      if(!loadfile.isEmpty())
>      {
>           QDir::setCurrent(QFileInfo(loadfile).absolutePath());
>           reg->loadParameters(loadfile.toStdString().c_str());
> ______________________________________________________
>  
>  
>  
>  
> The function loadParameters executes OK, the file is read and my 
> parameters take on the values in the file. then after when doing F11 it 
> seems to go into:
>  
> ______________________________________________________ 
> __CLR_OR_THIS_CALL ~basic_string()
> { // destroy the string
> _Tidy(true);
> }
> ______________________________________________________
>  
>  
> and crash at _Tidy(true). It brings up a failure and stops at qhash.h in 
> function :
>  
> Q_OUTOFLINE_TEMPLATE typename QHash<Key, T>::Node **QHash<Key, 
> T>::findNode(const Key &akey,
> uint *ahp) const
>  
>  
> at line:
>  
> while (*node != e && !(*node)->same_key(h, akey))
>  
>  
> Since the file is read I conclude the string is ok, I wonder what could 
> cause this. It is obviously due to my code, I wonder if it is related to 
> Qt now or is it a string problem?!? Why would the crash end up in Qhash?
>  
> Thanks again for helping, it's very appreciated,
>  
> Regards,
> Pascale
>  
> 
> 
>  > Date: Thu, 8 Jan 2009 12:29:02 +0000
>  > From: Ian.Thomson at iongeo.com
>  > To: qt-interest at trolltech.com
>  > Subject: Re: [Qt-interest] Qt with x64 computer
>  >
>  > Hi,
>  >
>  > This is probably caused by a problem in your code. Without seeing your
>  > code or, even better, a small example which demonstrates your problem, I
>  > doubt anyone will be able to help.
>  >
>  > Is it intentional that your hash type is a pointer to a pointer to a
>  > QObject?
>  >
>  > Cheers,
>  > Ian.
>  >
>  > P B wrote:
>  > > Hi André,
>  > >
>  > > I am completely new to compiling and using Qt. So since there's no
>  > > problem with x64, I'm obviously doing something wrong. Do you have an
>  > > idea what an error in Qhash could indicate? The stack indicates this
>  > > when stopping in debug mode: QtCored4.dll!QHash<QObject *,QObject *
>  > > *>::findNode(QObject * const & akey=, unsigned int * ahp=0x0240a058).
>  > >
>  > >
>  > > Thanks again for helping!
>  > >
>  > > Regards,
>  > > Pascale
>  > >
>  > > > Date: Thu, 8 Jan 2009 13:04:18 +0100
>  > > > From: apoenitz at trolltech.com
>  > > > To: chose29 at hotmail.com
>  > > > Subject: Re: [Qt-interest] Qt with x64 computer
>  > > >
>  > > > P B wrote:
>  > > > > Hi,
>  > > > >
>  > > > > I am new to Qt, using an open source version. [...]
>  > > > > Is there still a problem with Qt and x64? The debugger stops at :
>  > > >
>  > > > [Not sure what the "still" in the sentence means, anyway:]
>  > > >
>  > > > A fairly large portion of both Qt users and Qt developers use
>  > > > Qt on 64bit machines on Windows and Unix, so there does not
>  > > > seem to be a general "problem with Qt and x64".
>  > > >
>  > > > Regards,
>  > > > Andre'
>  > >
>  > >
>  > > 
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