python c interface problems

[saintlyav]

I recently made a python module which calls functions from a c program. I used SWIG to generate the wrapper code from an interface file, and compiled the module into a dll which i can import in python and call functions from. While some of the functions are working fine, the others are giving serious errors like:

Python 2.4.3 (#1, May 18 2006, 07:40:45)
[GCC 3.3.3 (cygwin special)] on cygwin
Type "help", "copyright" , "credits" or "license" for more information.
>>> import agent
>>> agent.dummy_foo ()
agent::dummy_fo o called!!
x val is: 25
0
>>> agent.get_agent _property(40,12 ,"agentclass ")
you are in get_agent_prope rty:
40 [main] python 5216 _cygtls::handle _exceptions: Error while dumping state
(probably corrupted stack)
Segmentation fault (core dumped)


As shown above, i have no problem calling a dummy function, but when i call the other function, i get the "corrupted stack" and "segmentati on fault" errors. I am running these on Cygwin.

Could anyone help me out with this?

[bartonc]

I recently made a python module which calls functions from a c program. I used SWIG to generate the wrapper code from an interface file, and compiled the module into a dll which i can import in python and call functions from. While some of the functions are working fine, the others are giving serious errors like:

Python 2.4.3 (#1, May 18 2006, 07:40:45)
[GCC 3.3.3 (cygwin special)] on cygwin
Type "help", "copyright" , "credits" or "license" for more information.
>>> import agent
>>> agent.dummy_foo ()
agent::dummy_fo o called!!
x val is: 25
0
>>> agent.get_agent _property(40,12 ,"agentclass ")
you are in get_agent_prope rty:
40 [main] python 5216 _cygtls::handle _exceptions: Error while dumping state
(probably corrupted stack)
Segmentation fault (core dumped)


As shown above, i have no problem calling a dummy function, but when i call the other function, i get the "corrupted stack" and "segmentati on fault" errors. I am running these on Cygwin.

Could anyone help me out with this?

If you have done the string interface correctly, then the problem must be in the C part, because the string is the only thing that will allocate memory in the interface.