Unhandled Exception At Multiarray.pyd The 2nd Time The Program Runs

I'm making a .dll plug-in in c++ and embedding python 2.7 in it. Everything worked fine with simple .py programs until I imported a large program. The strangest thing is that the p

Solution 1:

I managed to work past this problem. It seems that some modules have problems when their initialization routines are called more than once, and numpyis one of those. The solution is to call Py_Finalize() only once at the very end of the program. Py_Initialize() can be called as many times as you want, as if Python is already initialized, Py_Initialize() is a non-op ...

And also, discovered that this solution turns the application faster since python doesn't need to restart every time there's a call to some of its function.

More information about it here

Solution 2:

Similar problem happens with pyHook and pyxhook library. Spent long time to figure out the reason of crash for those two modules but no clue available online. Now I am finding it is happening with numpy too. Hoping this one time Py_Finalize() will solve both of my problems.

The problem is solved after disabling python thread support in my embedded interpreter code by commenting the followings. By the way I am running the interpreter already in a POSIX thread created by my C code.

//PyEval_InitThreads();//gstate = PyGILState_Ensure();//PyGILState_Release(gstate);

Now I can run my py.script with numpy and pyHook many times. However it will cause the following error message at the end of the C code if the module thread is imported in python script directly or by any other imported module.

ExceptionKeyError: KeyError(14288,) in <module'threading'from'C:\python27\Lib\threading.pyc'> ignored

Still I feel It needs a better solution.