I realized my wrapping was broken, fixing that below...
On Jan 25, 12:47 am, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
wrote:
> I'm trying to wrap GNU readline withctypes(the Python readline
> library doesn't support the callback interface), but I can't figure out
> how to set values to a variable inside the library. This is Python 2.5
> on Linux. Here's what I have so far--if you comment out the memmove
> call (3 lines) it works as expected:
[SNIP]
> I need to assign ourfunc to RL_ATTEMPTED_COMPLETION_FUNCTION, but
> obviously simple assignment rebinds the name rather than assigning it
> to the C variable.
>
> Usingctypes.memmove to overwrite it(as I have here) will run the
> function but segfault when ourfunc goes to return (poking around with
> the debugger shows it's dying inctypes' callbacks.c at line 216, "keep
> = setfunc(mem, result, 0);" because setfunc is NULL). I'm not entirely
> sure that's not because of some error in the prototyping or restype
> setting rather than as a result of memmove, but the memmove seems
> sketchy enough (only sets the function pointer itself presumably, not
> anything thatctypeswrappers need) that I'm looking for a better way
> to do it.
>
> As it is, returning rv directly or simply returning None causes the
> same segfault.
>
> Any idea?
>
> Thanks very much for your time!
# START
#!/usr/local/bin/python2.5
import ctypes
ctypes.cdll.LoadLibrary("libcurses.so")#, mode=ctypes.RTLD_GLOBAL)
ctypes.CDLL("libcurses.so", mode=ctypes.RTLD_GLOBAL)
ctypes.cdll.LoadLibrary("libreadline.so")
readline = ctypes.CDLL("libreadline.so")
RL_COMPLETION_FUNC_T = \
ctypes.CFUNCTYPE(ctypes.POINTER(ctypes.c_char_p),
ctypes.c_char_p, ctypes.c_int, ctypes.c_int)
RL_LINE_BUFFER = ctypes.c_char_p.in_dll(readline, "rl_line_buffer")
RL_ATTEMPTED_COMPLETION_FUNCTION = \
RL_COMPLETION_FUNC_T.in_dll(readline,
"rl_attempted_completion_function")
def our_complete(text, start, end):
print "Test", text, start, end
rv = None
arrtype = ctypes.c_char_p*4
globals()["rv"] = arrtype("hello", "hatpin", "hammer", None)
globals()["crv"]=ctypes.cast(rv, ctypes.POINTER(ctypes.c_char_p))
return rv
ourfunc = RL_COMPLETION_FUNC_T(our_complete)
_readline = readline.readline
_readline.argtypes = [ctypes.c_char_p]
_readline.restype = ctypes.c_char_p
ctypes.memmove(ctypes.addressof(RL_ATTEMPTED_COMPLETION_FUNCTION),
ctypes.addressof(ourfunc),
4)
line = _readline("Input: ")
print "INPUT was: ", line
#END
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