从ctypes的c_char_p中检索字符串

Question

In Python, I have a ctypes.c_char_p's string, 'Hello, world'. It seems that python automatically encodes it to a number (see below from my ipython console). How can I retrieve the string, namely, 'Hello, world', from the ctypes.c_char_p object?

In [45]: from ctypes import c_char_p

In [46]: c_char_p("Hello, World")
Out[46]: c_char_p(4508383228)

Answer 1

As already mentioned in comments, although perhaps not as explicitly as some might require, the .value attribute converts from ctypes.c_char_p to a Python string.

This code round trips a Python string to a ctypes.c_char_p and then back to a Python string:

>>> p = c_char_p("Hello, World")
>>> p
c_char_p(140323010068388)
>>> type(p)
<class 'ctypes.c_char_p'>
>>> s = p.value
>>> s
'Hello, World'
>>> type(s)
<type 'str'>