Hi all,
I have a mmap and a data structure in it. I know the structure's
location in the mmap and what structure it is. It has a ctypes
definition.
I want to initialize a ctypes object to point to a part of the mmap.
Here is my attempt:
>>> b
<mmap.mmap object at 0x009FEDB8>
>>> c= ctypes.pointer( b )
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\programs\Python25\lib\ctypes\__init__.py", line 318, in
pointer
return POINTER(type(inst))(inst)
File "C:\programs\Python25\lib\ctypes\__init__.py", line 262, in
POINTER
{'_type_': cls})
TypeError: _type_ must have storage info
and then use 'cast', but it fails here.
Is there some way to combine ctypes with struct.pack_into and
struct.unpack_from? Can I access the mmap's buffer directly? Could
be very handy and I'm willing to talk about the C function involved.
What kind of modification to mmapmodule would we be looking at? Does
someone want to do it with me?
I am looking at mmapmodule.c, line 75, access to the char * data
member of mmap_object. Link is here:
http://www.google.com/codesearch?hl=en&q=mmapmodule.c+show:C2urmIRSr9c:7uYx_idG-6A:xyEMaz16V1Y&sa=N&cd=11&ct=ri&cs_p=http://svn.python.org/snapshots/python25.tar.bz2&cs_f=python/Modules/mmapmodule.c
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