[PyKDE] Using SIP modules from embedded Python

[Paul Giannaros]

On Monday 19 February 2007 13:34, Phil Thompson wrote:
> On Monday 19 February 2007 12:55 pm, Paul Giannaros wrote:
> > Hi there,
> > I have wrapped key bits of Kate's interface (as documented at
> > http://developer.kde.org/documentation/library/3.5-api/kdebase-apidocs/ka
> >te /html/) with SIP. Firstly, thanks for SIP -- along with good
> > documentation, ease of use, and Qt/KDE support it was a piece of cake.
> > However, my intention is to use that library from within a C++ Kate
> > Plugin. The plugin embeds Python and (so far) just attempts to import the
> > SIP-created module. Doing so gives an ImportError, however, which I do
> > not get if I just import the module from the interactive interpreter.
> >
> > The error is:
> > ImportError: /usr/lib/python2.5/site-packages/sip.so: undefined symbol:
> > _Py_ZeroStruct.
> >
> > Both my C++ plugin and my SIP extension link to python (the SIP extension
> > does because if I don't I get a 'PyCObject_Type' undefined error when
> > trying to import it).
> >
> > Another interesting thing is that If I isolate the importing code from
> > the Kate plugin with a simple application, it imports fine.
> >
> > Any ideas what's going wrong?
>
> There are a couple of things your plugin needs to do (for a Qt4 example see
> the new Designer plugin in current PyQt4 snaphots).
>
> You need to make sure the Python shared library is loaded and that it
> exports all of its symbols.

I'm currently just linking to it on the command line (via -lpython2.5) when I 
link my library. I see from designer/pluginloader.cpp that you use 
QLibrary::load as well? I tried doing that but setLoadHints isn't available 
here (Qt 3.3) and just calling load() causes the same error.

>
> You should also make sure you link against the Python shared library and
> not the static one.
>

I can verify that I'm linking to the shared library via `ldd mykateplugin.so`:
....
libpython2.5.so.1.0 => /usr/lib/libpython2.5.so.1.0 (0xb7d16000
....

> Phil
>
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