Re: NtQuerySystemInformation

Why not call it as

spi = SYSTEM_HANDLE_INFORMATION()

retlen = c_ulong()

res = windll.ntdll.NtQuerySystemInformation(SystemHandleInformation,
                                            byref(spi),
                                            sizeof(spi),
                                            byref(retlen))


On Wed, Oct 28, 2015 at 2:03 PM, Diez B. Roggisch <[email protected]> wrote:

> Have you tried defining the signature of NtQuerySystemInformation? It
> could be that arguments are being truncated.
>
> Also, is that really a CDLL, not a WINDLL?
>
> Cheers,
>
> Diez
>
> On 28 Oct 2015, at 13:31, Cristian Badescu <[email protected]>
> wrote:
>
> Hello,
>
> I am trying to get handles information by using NtQuerySystemInformation
> but my code fails for some reason. I am using the following code to call
> NtQuerySystemInformation:
>
> from ctypes import *
> from ctypes.util import *
>
> class SYSTEM_HANDLE(Structure):
>
>     _fields_ = [("ProcessId", c_ulong),
>                 ("ObjetTypeNumber", c_byte),
>                 ("Flags", c_byte),
>                 ("Handle", c_ushort),
>                 ("Object", c_void_p ),
>                 ("GrantedAccess", c_ulong)
>                 ]
>
> class SYSTEM_HANDLE_INFORMATION(Structure):
>
>     _fields_ = [("HandleCount", c_ulong),
>                 ("Handles", SYSTEM_HANDLE * 1)
>                 ]
>
> handleInfoSize = 65536
>
> SystemHandleInformation = 16
>
> c_lib=CDLL(find_library("c"))
> malloc=c_lib.malloc
> malloc.restype=c_void_p
> handleInfo = malloc(handleInfoSize)
>
> pHandleInfo = cast(handleInfo, POINTER(SYSTEM_HANDLE_INFORMATION))
>
> retVal = cdll.ntdll.NtQuerySystemInformation(SystemHandleInformation, pHandleInfo, handleInfoSize, None)
>
>
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