"News Wombat" <newswom...@gmail.com> wrote in message
news:413f5a8f-69a0-4351-acc2-18d7edda8...@j3g2000vbp.googlegroups.com...
On Dec 11, 12:59 pm, MrJean1 <mrje...@gmail.com> wrote:
> In general, for shared libraries, you need to define those first as
> prototype using ctypes.CFUNCTYPE() and then instantiate each prototype
> once supplying the necessary parameter flags using
> prototype(func_spec, tuple_of_param_flags). See sections 15.16.2.3
> and 4 of the ctypes docs*.
I tried the cfuntype and proto steps, and it's not crashing now
(that's good), but now i'm just left with null pointers as a return
object. I'm still working through all of the examples you sent. They
were extremely helpful. Here's where I'm at now...
What is strange is I can actually get smiGetNode to work if I don't
cfunctype/proto it. If i do, nada. however, the smiGetNextNode fails
no matter what, usually with a segfault, but depending on how i
construct it, sometimes a null pointer.
constants.py: http://pastebin.com/f3b4Wbf0
libsmi.py: http://pastebin.com/XgtpG6gr
smi.c (the actual function): http://pastebin.com/Pu2vabWM
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constants.py, in SmiNode and SmiModule definitions:
- Any field defined "char*" in C should be "c_char_p" not
"POINTER(c_char_p)" (which is char**).
The function definition can be simplified, and 2nd argument corrected
(c_char_p not POINTER(c_char_p)). Python strings can be passed directly to
c_char_p arguments.
SmiGetNode = clibsmi.smiGetNode
SmiGetNode.argtypes = [POINTER(SmiModule),c_char_p]
SmiGetNode.restype = POINTER(SmiNode)
oid = "1.3.6.1.2.1.2.2"
sn=SmiGetNode(None,oid)
Give these fixes a try...
-Mark
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