Raising Python exceptions from C code

I’m trying to figure out how I can raise a Python exception from a function in my .i file.  It’s fairly easy to call PyErr_SetString in the function, but the problem is that Python expects that when an exception occurs no value should be returned by the called function.  My function returns a pointer, but it’s NULL if an error occurs.  This NULL gets wrapped in a SWIG_NewPointerObj(SWIG_as_voidptr(result), … ) call and returned to Python which results in Python complaining about the returned value.  What I’d like to have happen in the wrapper is:

   resultobj =  (!result && PyErr_Occurred()) ? NULL : SWIG_NewPointerObj(SWIG_as_voidptr(result), SWIGTYPE_p_void, 0 |  0 );

This way, if the result is NULL and a Python exception happened during the function, a NULL would be returned to make Python happy.

Maybe there’s a better way to do what I’m attempting, but this was what I came up with.  I’m just not sure how to get this syntax into my wrappers without post-processing them.

Kevin Smith
[email protected]






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