[Tutor] ctypes wintypes
Michael C
mysecretrobotfactory at gmail.com
Thu Oct 5 15:34:28 EDT 2017
Sorry about asking these super obvious little things, I am actually a 1st
student, but I acing my programming 101 at the moment lol
On Thu, Oct 5, 2017 at 12:27 PM, Michael C <mysecretrobotfactory at gmail.com>
wrote:
> First of all, thanks for the reply.
>
>
> How do I see the values of each field? This doesn't work.
>
> print(PMEMORY_BASIC_INFORMATION.Protect)
>
> thanks!
>
> On Thu, Oct 5, 2017 at 11:34 AM, eryk sun <eryksun at gmail.com> wrote:
>
>> On Tue, Oct 3, 2017 at 10:30 PM, Michael C
>> <mysecretrobotfactory at gmail.com> wrote:
>> >
>> > I am trying to create SYSTEM_INFO structure and
>> MEMORY_BASIC_INFORMATION
>> > structure
>>
>> First, avoid relying on constants, enumerations, and structures
>> published on MSDN. It's not always right. Get the SDK and use the
>> header files instead. MEMORY_BASIC_INFORMATION is defined in winnt.h,
>> and SYSTEM_INFO is defined in sysinfoapi.h.
>>
>> MEMORY_BASIC_INFORMATION is simple. Don't worry about the
>> MEMORY_BASIC_INFORMATION32 and MEMORY_BASIC_INFORMATION64 versions.
>> Those are meant for a debugger that's reading this structure directly
>> from the memory of another process.
>>
>> SYSTEM_INFO is a bit tricky, given the anonymous struct and union. I
>> prefer to nest the definitions, but you could flatten it as separate
>> definitions if you like. Refer to the docs for how to use _anonymous_:
>>
>> https://docs.python.org/3/library/ctypes#ctypes.Structure._anonymous_
>>
>> Here are the definitions. Please don't mindlessly copy and paste.
>> Recreate them on your own and use this example as a reference.
>>
>> import ctypes
>> from ctypes.wintypes import WORD, DWORD, LPVOID
>>
>> PVOID = LPVOID
>> SIZE_T = ctypes.c_size_t
>>
>> # https://msdn.microsoft.com/en-us/library/aa383751#DWORD_PTR
>> if ctypes.sizeof(ctypes.c_void_p) == ctypes.sizeof(ctypes.c_ulonglong):
>> DWORD_PTR = ctypes.c_ulonglong
>> elif ctypes.sizeof(ctypes.c_void_p) == ctypes.sizeof(ctypes.c_ulong):
>> DWORD_PTR = ctypes.c_ulong
>>
>> class MEMORY_BASIC_INFORMATION(ctypes.Structure):
>> """https://msdn.microsoft.com/en-us/library/aa366775"""
>> _fields_ = (('BaseAddress', PVOID),
>> ('AllocationBase', PVOID),
>> ('AllocationProtect', DWORD),
>> ('RegionSize', SIZE_T),
>> ('State', DWORD),
>> ('Protect', DWORD),
>> ('Type', DWORD))
>>
>> PMEMORY_BASIC_INFORMATION = ctypes.POINTER(MEMORY_BASIC_INFORMATION)
>>
>> class SYSTEM_INFO(ctypes.Structure):
>> """https://msdn.microsoft.com/en-us/library/ms724958"""
>> class _U(ctypes.Union):
>> class _S(ctypes.Structure):
>> _fields_ = (('wProcessorArchitecture', WORD),
>> ('wReserved', WORD))
>> _fields_ = (('dwOemId', DWORD), # obsolete
>> ('_s', _S))
>> _anonymous_ = ('_s',)
>> _fields_ = (('_u', _U),
>> ('dwPageSize', DWORD),
>> ('lpMinimumApplicationAddress', LPVOID),
>> ('lpMaximumApplicationAddress', LPVOID),
>> ('dwActiveProcessorMask', DWORD_PTR),
>> ('dwNumberOfProcessors', DWORD),
>> ('dwProcessorType', DWORD),
>> ('dwAllocationGranularity', DWORD),
>> ('wProcessorLevel', WORD),
>> ('wProcessorRevision', WORD))
>> _anonymous_ = ('_u',)
>>
>> LPSYSTEM_INFO = ctypes.POINTER(SYSTEM_INFO)
>>
>
>
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