Dag Sverre Seljebotn wrote:
> Chris Colbert wrote:
>> Given our previous conversation, it will probably be easier to use
>> ctypes to get the function handles for dynamically loaded libraries
>> and *somehow* get that function pointer into Cython.
>>
>> My attempt is like so (for a simple example) but Cython is complaining
>> during compilation:
>>
>>
>> from ctypes import *
>>
>> cdef extern from "Python.h":
>> void* PyLong_AsVoidPtr(object)
>>
>> cdef int a
>>
>> libc = CDLL('libc.so.6')
>> timefunc = libc.time
>>
>> cdef object tptr = ctypes.addressof(timefunc)
>> cdef int (*mytime)()
>> mytime = PyLong_AsVoidPtr(tptr)
>>
> I think this should do it:
>
> ctypedef int (*timefuncptr)()
> cdef timefuncptr mytime
> mytime = <timefuncptr>ctypes.addressof(libc.time)
Sorry, that should be
mytime = <timefuncptr><size_t>ctypes.addressof(libc.time)
i.e. convert to typed integer of pointer size before converting to
pointer. The same goes for the example below.
>
> That is, unless ctypes.addressof returns the address of the *pointer*
> to the function stored in libc.time (I'm not familiar enough with
> ctypes). In that case it is instead:
>
> mytime = (<timefuncptr*>ctypes.addressof(libc.time))[0]
>
> Dag Sverre
>
_______________________________________________
Cython-dev mailing list
[email protected]
http://codespeak.net/mailman/listinfo/cython-dev
