I don't see a clean way to create a numpy array from a ctypes pointer object. Is the __array_interface_ in ctypes the thing thats missing needed to make this happen? I've followed Albert's Scipy cookbook on ctypes here
http://www.scipy.org/Cookbook/Ctypes <-- getting dated now for numpy SVN but the idea is clear This shows clean ways to 1) Create a ctype array object from a numpy array: npptr= nparray.__array_interface__['data'][0] ctarray = (c_double * nparray.size).from_address(npptr) 2) Create a numpy array from a ctypes array (not a pointer): ctarray = (c_double * 2)() nparray = N.array( ctarray ) But if I'm starting with say, a POINTER(c_int) and a separate size argument that's returned from a ctypes foreign function or provided by _fields_ element in a ctypes structure, then I'm unclear how to provide the pointer in Python to numpy. The numpy methods or creating an array in Python as I see it are basically two: N.array, N.asarray <-- require a sequence object N.fromstring, N.frombuffer <-- not available unless given c_char_p and even thats wrong if I don't want zero termination. The attributes in nparray.__array_interface_ are not writable, so no joy there. On the C side the PyArray_SimpleNewFromData( ..dimensions, ...data ptr) C API does the job nicely. Is there a ctypes paradigm for SimpleNew...? Mark ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
