[PyQt] QLibraryInfo and images

[Hans-Peter Jansen]

Am Dienstag 13 Oktober 2009 schrieb Scott Frankel:
> Hi David,
>
> Thanks for considering my question.
>
> On Oct 5, 2009, at 5:58 PM, David Boddie wrote:
> > On Thu, 1 Oct 2009 23:04:49 -0700, Scott Frankel wrote:
> >> Can a qt.conf file be used to specify an images directory using the
> >> QLibraryInfo.LibraryLocation enum?
> >
> > Maybe you could use the Data entry for images:
> >
> >  http://doc.trolltech.com/4.5/qt-conf.html
>
> That's exactly what I'd thought, but didn't get positive results.
> Though it could be due to incorrect syntax.  For example, web
> searching turned up the following tip that helped resolve my "cannot
> move to target thread error"
> Create a file dist/<application.app>/Contents/Resources/qt.conf
> with contents as follows:
> [Paths]
> qt_plugpath=plugins
>
> Is there an analogous term, qt_plugpath, for data directory
> declarations?  I haven't been able to find a reference to either in
> any of the trolltech/nokia doc pages or the Qt Assistant.  qt_plugpath
> seems to work; but I'd feel more comfortable if I could find an
> official reference to it ;)
>
> >> I wonder if I'm barking up the right tree.  My app displays images
> >> that have been compiled as resources (.png, .tif, or .jpg) without
> >> issue on Fedora and Windows.  But it doesn't display them on OSX.
> >> (Note that I'm using a qt.conf file in my OSX app bundle to locate a
> >> plugins dir.)
> >
> > So, I guess you're packaging your application along with Qt and PyQt
> > in a
> > bundle and I assume that support for images is built as plugins, and
> > I'm
> > guessing that some misconfiguration is causing this to fail.
>
> Yes, though I haven't built any of the support for images explicitly.
> Rather I've configured my build machine using macports.  The issues I
> ran into building for OSX (ironically, the OS I'm developing on)
> placed me squarely between three technologies:  Qt/PyQt, py2app, and
> macports.  Finding which of the three was the culprit, or which could
> be used to provide a cure, proved a challenging task.
>
> >> The enum docs (http://doc.trolltech.com/4.4/qlibraryinfo.html) aren't
> >> specific about image data and my tests at possible syntax haven't
> >> yielded any positive results.
> >
> > The QLibraryInfo class and your resource files are two separate
> > things - I
> > assume that by "resources" you mean you compiled your image files to
> > Python
> > modules using pyrcc4. Is that the case?
>
> Yes, the images are compiled in a .qrc file.
>
> A solution that seems to be working is copying the tiff and jpg
> libraries to the plugin dir after building with py2app.  Once there,
> the qt_plugpath term works its OSX magic.

Hi Scott, you might try the pyinstaller svn version. It did quite some 
progress lately. There might still some issues left with plugins, but they 
can be resolved easily. 

My mac project succeeded with Python and Qt from their sites, a few 
utilities via macports, and a home rolled sip-4.8.2/PyQt-4.5.4 build.
With a few tweaks it builds as universal binary for 10.4 and 10.5. I found, 
that both versions behave largely different, when it comes to resolving 
libraries, where the plugins are a special case in that area.

Pete