Python and ROOT

Dear ROOTers,  

I have a pile of C++ code that uses ROOT to display running histograms. Works nicely.

I'm using SWIG to provide a Pyton interface for my code, that also works nicely but up to a point.

SWIG creates a C++ wrapper which is used to create a shared library which is linked against the ROOT libraries.

It also create a .py package which I can import and if I don't use ROOT things also work nicely. The moment I use a class which calls on ROOT functions, Python crashes with the following message:  

>>> net=Dynamic.D_DynamicNetwork()

>>> net.ConfigureSimulation(par_run)

dlopen error: /usr/not-backed-up/root/lib/root/libASImage.so: undefined symbol: _ZNK7TObject7DoErrorEiPKcS1_Pc

Load Error: Failed to load Dynamic link library /usr/not-backed-up/root/lib/root/libASImage.so

Error in <TGHScrollBar::TGHScrollBar>: arrow_*.xpm not found

Error in <TGVScrollBar::TGVScrollBar>: arrow_*.xpm not found  

This symbol is in libCore.so, so I'm curious why the error is generated in libASImage.so. I have checked that I link against libCore.so and anyway the problem occurs at loading time. My LD_LIBRARY_PATH is set correctly (my C++ code wouldn't work if not). Loading the libraries directly in Python reproduces the problem.

Does anyone know what goes on here?  

>>> import ctypes

>>> ctypes.cdll.LoadLibrary("libCore.so")

<CDLL 'libCore.so', handle 9be2568 at b7f6508c>

>>> ctypes.cdll.LoadLibrary("libASImage.so")

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/usr/lib/python2.5/ctypes/__init__.py", line 395, in LoadLibrary

    return self._dlltype(name)

  File "/usr/lib/python2.5/ctypes/__init__.py", line 312, in __init__

    self._handle = _dlopen(self._name, mode)

OSError: /usr/not-backed-up/root/lib/root/libASImage.so: undefined symbol: _ZNK7TObject7DoErrorEiPKcS1_Pc  

Thanks,

Marc

-

Dr. Marc de Kamps

Biosystems Group

School of Computing

University of Leeds

LS29JT, Leeds, UK  

dekamps_at_comp.leeds.ac.uk

http:/www.comp.leeds.ac.uk/dekamps   Received on Tue Jul 08 2008 - 19:35:12 CEST