Installing JModelica after PythonXY

To get JModelica 1.5 to work with PythonXY 2.6.5.6 on win7 Professional, the following steps will work:

1. Install PythonXY using default options.
2. Start the JModelica install. When given a choice on where install, choose C:\.
3. Add a path file to the site-packages directory in python. In a default install of PythonXY, the location is “C:\Python26\Lib\site-packages”. The name of the file should be “jmodelica.pth”. The contents of the file is a single line “C:\JModelica.org-1.5\Python”. To understand how Python paths work, see this reference.
4. Open “C:\JModelica.org-1.5\setenv.bat” with a text editor. Manually set all of the environment variables in your system to match the environment variables defined in this file.
5. Start a python interpreter in PythonXY.
6. Follow the direction for testing in “C:\JModelica.org-1.5\README.TXT”. The tests should complete successfully.

Addendum:
   This approach also works with JModelica 1.6 and PythonXY 2.7.2.
   Simply substitute "JModelica.org-1.6" for "JModelica.org-1.5" in the above steps.

This work is licensed under a Creative Commons Attribution By license.

PythonXY 2.6.2 + Panda3d 1.7.0 + JModelica 1.1b1 – How to get to work together

If Panda3D 1.7.0 is added to Python using a ‘pth’ file, then JModelica 1.1b1 will load the wrong ‘mscvrt.dll’ and fail to initialize. This problem occurs:

In [1]: import jmodelica.examples.cstr as cstr
C:\Python26\lib\site-packages\jpype\_pykeywords.py:18: DeprecationWarning: the s
ets module is deprecated
  import sets
---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)

C:\JModelica.org-1.1b1\work\<ipython console> in <module>()

C:\JModelica.org-1.1b1\Python\jmodelica\examples\cstr.py in <module>()
      9 from jmodelica.initialization.ipopt import NLPInitialization
     10 from jmodelica.initialization.ipopt import InitializationOptimizer
---> 11 from jmodelica.simulation.sundials import TrajectoryLinearInterpolation
     12 from jmodelica.simulation.sundials import SundialsDAESimulator
     13 from jmodelica.optimization import ipopt

C:\JModelica.org-1.1b1\Python\jmodelica\simulation\sundials.py in <module>()
     14
     15 try:
---> 16     from pysundials import cvodes
     17     from pysundials import ida
     18     from pysundials import nvecserial

C:\Python26\lib\site-packages\pysundials\cvodes.py in <module>()
     38
     39 import ctypes
---> 40 import sundials_core
     41 import nvecserial
     42

C:\Python26\lib\site-packages\pysundials\sundials_core.py in <module>()
     87 f.close()
     88
---> 89 libc = loadlib("c")
     90 try:
     91         libc.fdopen.argtypes = [ctypes.c_int, ctypes.c_int]

C:\Python26\lib\site-packages\pysundials\sundials_core.py in loadlib(libname)
     63                 lib = ctypes.CDLL(libpaths[libname])
     64         except OSError, e:
---> 65                 raise OSError("%s\nCannot load shared library %s. Please
check you config file and ensure the paths to the shared libraries are correct.
"%(e, libpaths[libname]))
     66         return lib
     67

OSError: [Error 1114] A dynamic link library (DLL) initialization routine failed

Cannot load shared library C:\Panda3D-1.7.0\bin\msvcrt.dll. Please check you con
fig file and ensure the paths to the shared libraries are correct.

The occurs in pysundials because the util.find_library('msvcrt') in the ctypes module is attempting to load the ‘msvcrt.dll’ which is installed with Panda3D. This problem can be fixed by forcing pysundials to load a compatible msvcrt.dll file, rather than the most recent. This is done by modifying pysundials_core.py to point to the correct dll. The following change starting at line 42 will force a specific dll to be loaded. The path and dll to use will be specific to each system.

if os.name == "nt":
    #clib = util.find_library('msvcrt')
    clib = 'C:\\Program Files (x86)\\Java\\jdk1.6.0_17\\jre\\bin\\msvcrt.dll'
else:
    clib = util.find_library('c')