Problem with access to shared memory(W2K) SOLVED

[Claudio Grondi]

I have got a solution to my problem from Thomas Heller by email.

The problem was solved by using .from_address() instead of
causing trouble cast() - here the solution as a generalized
example of code for reading access to shared memory area
with given 'appropriateName':

from ctypes import *
FILE_MAP_READ = 2

strNameOfSharedMemoryAreaToAccess = 'appropriateName'

handle = windll.kernel32.OpenFileMappingA(
   FILE_MAP_READ
  , 0
  , strNameOfSharedMemoryAreaToAccess
)
if not handle:
  raise WinError()

addr = windll.kernel32.MapViewOfFile(
   handle
  ,FILE_MAP_READ
  ,0
  ,0
  ,0
)
if not addr:
  raise WinError()

class structureOfSharedMemoryArea(Structure):
  _fields_ = [
     ("Elem01" , c_short ) # or any other ctype or ctype structure
     ("Elem02" , c_long )
     ...
     ("ElemNN" , c_long )
  ]

contentOfSharedMemoryArea = structureOfSharedMemoryArea.from_address(addr)

print 'Elem01 ', contentOfSharedMemoryArea.Elem01
print 'Elem02 ', contentOfSharedMemoryArea.Elem02
...
print 'ElemNN ', contentOfSharedMemoryArea.ElemNN

Claudio