Okay, thanks a lot for your reply Nick, I think you pushed me back on
the right way.
Now I started with trying to implement the callback functions and am
stuck at the following point:
I define my classes/structures/unions:
------------------------------CODE-----------------------------------------
class cdStream(Structure):
_fields_ = [("contextH", c_uint),
("open", c_void_p),
("close", c_void_p),
("read", c_void_p),
("write", c_void_p),
("seek", c_void_p),
("tell", c_void_p)]
class memunion(Union):
_fields_ = [("lpszFileName", c_char_p),
("pStream", cdStream)]
class cdStgMedium(Structure):
_fields_ = [("Type", c_uint),
("u", memunion)]
------------------------------\CODE----------------------------------------
then i define my functions (right now I do just nothing) and at the same
time I define the datatypes like they're listed in my C sample program:
------------------------------CODE-----------------------------------------
def pystreamopen (contextH, mode, pErr):
pass
cstreamopen = CFUNCTYPE(c_uint, c_ushort, c_uint)
def pystreamclose (contextH, pErr):
pass
cstreamclose = CFUNCTYPE(c_uint, c_uint)
def pystreamread (contextH, pBuf, pBufsize, pErr):
pass
cstreamread = CFUNCTYPE(c_uint, c_void_p, c_uint, c_uint)
def pystreamtell (contextH, pErr):
pass
cstreamtell = CFUNCTYPE(c_uint, c_uint)
def pystreamwrite (contextH, origin, offset, pErr):
print "writing..."
pass
cstreamwrite = CFUNCTYPE(c_uint, c_void_p, c_uint, c_uint)
------------------------------\CODE----------------------------------------
and now the problem starts: i want the pointers in the cdStream
Structure point at my functions and tried to do it the following way:
------------------------------CODE-----------------------------------------
data = cdStgMedium()
data.type = 0
data.u.pStream.contextH = c_uint(3) #must be some kind of identifier.
data.u.pStream.open = cstreamopen(pystreamopen)
data.u.pStream.close = cstreamclose(pystreamclose)
data.u.pStream.write = cstreamwrite(pystreamwrite)
data.u.pStream.tell = cstreamtell(pystreamtell)
data.u.pStream.read = cstreamread(pystreamread)
------------------------------\CODE----------------------------------------
unfortunately that doesn't work because Python returns a TypeError:
incompatible types, CFunctionType instance instead of c_void_p instance
Any ideas/help (please)?
Best regards,
Matt
--
http://mail.python.org/mailman/listinfo/python-list
