[Qt-interest] Hi Trolls, I have a problem of cohabitation between Qt 4.3.4 and Qt 4.7

[Fabio Giovagnini]

Thanks a lot.
Very very clear.

Best Regards


In data mercoledì 29 settembre 2010 12:55:30, Kai Koehne ha scritto:
: > On 9/29/2010 12:41 PM, ext Fabio Giovagnini wrote:
> > Thanks a lot for your answer;
> > Does your suggesiton  allow me to avoid modifing teh system path
> > variable?
> 
> No, you shouldn't motify the PATH variable, nor should you copy any Qt
> directories to System directories. That directly leads to the infamous
> dll hell.
> 
> > I need the modifiy it I will have the the same problem, or not?
> 
> According to e.g.
> http://msdn.microsoft.com/en-us/library/7d83bc18%28VS.71%29.aspx
> 
> the dlls in the same directory as the .exe will always take precedence
> over anything in %PATH%.
> 
> Actually via manifests you can even put the dlls in other places, but
> that's really cumbersome. If you stick with the setup I described
> everything should work.
> 
> Regards
> 
> Kai
> 
> PS: If you experience problems like this depends.exe is invaluable:
> http://www.dependencywalker.com/
> 
> > Thanks again and many regards
> > 
> > In data mercoledì 29 settembre 2010 12:04:03, Kai Koehne ha scritto:
> > :>  On 9/29/2010 10:55 AM, ext Fabio Giovagnini wrote:
> >>> Hi All, I try to explain better.
> >>> 
> >>> I distribute a tools in source version abd binary version together.
> >>> the binary version has the following folders' structure:
> >>> <install_DIR>\
> >>> tool
> >>> plugins
> >>> qtlib
> >>> 
> >>> and the nullsoft installer add to the system path<install_DIR>\qtlib
> >>> to make the tool runnable
> >> 
> >> That seems to be a dump idea. What you can do putting the needed Qt
> >> .dlls and plugin directories in the same directory as your app.exe .
> >> This way you don't have to set any system path. E.g.
> >> 
> >> <install_DIR>\tool.exe
> >> <install_DIR>\QtCore4.dll
> >> <install_DIR>\imageformats\qjpeg4.dll
> >> 
> >> Check out e.g. how creator does this.
> >> 
> >> Regards
> >> 
> >> Kai
> >> 
> >>> Well, now I have a version based on qt-4.3.4 and another version of the
> >>> same tool based on qt-4.7
> >>> 
> >>> If I install before teh qt-4.3.4 based one, and later the qt-4.7 based
> >>> one ; the last doesn't work telling me the application cannot find a
> >>> function in QtCore4.dll
> >>> 
> >>> This is right becouse I have first in the PATH the folder containing
> >>> the qt-4.3.4 version of QtCore4.dll and after the qt-4.7 version of
> >>> QtCore4.dll with the same name. So the dynamic linker loads teh first
> >>> one ignoring the second one being the right one.
> >>> 
> >>> How can I approach this problem.
> >>> 
> >>> Where could I study deeper about qt version cohabitation?
> >>> 
> >>> Thanks a lot

-- 
Ing. Fabio Giovagnini

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