QTCore4.dll Error (was Re: [Qgis-user] bug)

[Alister Hood]

> > > So could this be the problem?  A conflict of interest for this
> file?
> >
> > Is indeed a conflict with other copies of the same .dll installed by
> > other programs
> >
> > https://trac.osgeo.org/qgis/ticket/2965
> 
> 
> Well... where getting warmer :)
> I went and renamed the QtCore4_.dll file to
>  QtCore4_old.dll
> 
> and ran the CCleaner program to make sure everything was gone.

I think CCleaner won't achieve much - isn't it intended to clean up 
after programs that have been uninstalled?
The problem is probably due to other QT libraries (i.e. not QtCore) 
in the system directory, and maybe other dependencies too. 

I think you need to uninstall the program that put the QT libraries 
there.  Perhaps this could even be an old version of QGIS - does 
anyone know if the Windows installer ever put QT in the system 
directory?

> This setup version includes Grass ... is there a version of Qgis 1.6
> which
> does NOT include grass?  Perhaps grass is causing the conflict of
> interest?
> 
> 
> Grass GIS seems to be a competing mapping program as it appears todo
> the
> same things as Qgis
> http://en.wikipedia.org/wiki/GRASS_GIS
>  And it too seems to be a lovely program. (for those who know how to
> use it)
> :)
> 
> So it appears that this discussion has now gone off topic, as Grass
has
>  it's own mailing list and support system, there is a handy 'start
> Grass now
> button' and a handy 'Uninstall Grass' option too.  The instruction
file
> requires me to actually read it... so maybe it'll help :)
> 
> http://lists.osgeo.org/mailman/listinfo/grass-user
> 

The GRASS included in the QGIS installer won't conflict with QGIS.  If 
you also had a standalone GRASS installed maybe that could cause 
problems.  
But GRASS does not use QT.  Your problem is the program that thought it 
was a good idea to install QT libraries in the Windows system directory.


Did you say that an older installer of QGIS does work?  Which one?


Alister