ctypes structure with a variable-size field at the end

Hi,

I would like to know how to write a ctypes::Structure with a variable-size
field at the end.
It occurs in many protocols to have a data field with a size early defined.
I have been searching a solution through the web (very usual question) for a
while but without any success ...

Attempt #1: Append a new field to the list _fields_ does NOT work...
<code>
class LV(Structure):
  _fields_ = [('Length', c_ushort)]

lv = LV()
lv.Length = 5
lv._fields_.append(('Value', c_ubyte * 5) # ==> added but not usable
<end of code>

Attempt #2: use of ctypes.resize() seems to fail for ctypes.Structure

First, is it possible? if so, how to write it?
I Hope someone could help me!
Thanks.

.: Gatch, Python 2.5.4, CTypes 1.0.3

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