Pointers in Structures

Hello all,

I have a question about setting pointers within structures.
This is what I had in mind:

from binascii import *
from ctypes import *

class MyStruct(Structure):
     _fields_ = [("foo", c_uint), ("bar", POINTER(c_uint))]


But, as you can see below, setting s.bar does not change the memory 
content of s:

In [2]: s = MyStruct()

In [3]: byref(s)
Out[3]: <cparam 'P' (0x101e346d0)>

In [4]: hexlify(string_at(0x101e346d0, 8))
Out[4]: '0000000000000000'

In [5]: x = c_uint(1)

In [6]: p = pointer(x)

In [7]: s.foo = x

In [8]: s.bar = p

In [9]: hexlify(string_at(0x101e346d0, 8))
Out[9]: '0100000000000000'

What am I doing wrong?

Thanks,
Guy

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