Hi,
I'm trying to figure out why this works after lots and lots of messing about with
obo.librar_version is a c function which requires char ** as the input and does a strcpy to passed in char.
from ctypes import *
_OBO_C_DLL = 'obo.dll'
STRING = c_char_p
OBO_VERSION = _stdcall_libraries[_OBO_C_DLL].OBO_VERSION
OBO_VERSION.restype = c_int
OBO_VERSION.argtypes = [POINTER(STRING)]
def library_version():
s = create_string_buffer('\000' * 32)
t = cast(s, c_char_p)
res = obo.library_version(byref(t))
if res != 0:
raise Error("OBO error %r" % res)
return t.value, s.raw, s.value
library_version()
The above code returns
('OBO Version 1.0.1', '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00', '')
What I don't understand is why 's' does not have any value? Anyone have any ideas? Thx