Windows processor architecture via Windows API

win_proc_arch.py

import ctypes
 
DWORD = ctypes.c_ulong
DWORD_PTR = DWORD
LPVOID = ctypes.c_void_p
WORD = ctypes.c_ushort

# MSDN info: http://msdn.microsoft.com/en-us/library/ms724958(VS.85).aspx

class SYSTEM_INFO_struct(ctypes.Structure):
    _fields_ = [
        ('wProcessorArchitecture', WORD),
        ('wReserved', WORD)
    ]
 
class SYSTEM_INFO_union(ctypes.Union):
    _fields_ = [
        ('dwOemId', DWORD),
        ('struct', SYSTEM_INFO_struct)
    ]
 
class SYSTEM_INFO(ctypes.Structure):
    _fields_ = [
        ('union', SYSTEM_INFO_union),
        ('dwPageSize', DWORD),
        ('lpMinimumApplicationAddress', LPVOID),
        ('lpMaximumApplicationAddress', LPVOID),
        ('dwActiveProcessorMask', DWORD_PTR),
        ('dwNumberOfProcessors', DWORD),
        ('dwProcessorType', DWORD),
        ('dwAllocationGranularity', DWORD),
        ('wProcessorLevel', WORD),
        ('wProcessorRevision', WORD)
    ]
 
LPSYSTEM_INFO = ctypes.POINTER(SYSTEM_INFO)

def GetSystemInfo():
    _GetSystemInfo = ctypes.windll.kernel32.GetSystemInfo
    _GetSystemInfo.argtypes = [LPSYSTEM_INFO]
    _GetSystemInfo.restype = None
    si = SYSTEM_INFO()
    _GetSystemInfo(ctypes.byref(si))
 
    return si
 
def GetNativeSystemInfo():
    _GetNativeSystemInfo = ctypes.windll.kernel32.GetNativeSystemInfo
    _GetNativeSystemInfo.argtypes = [LPSYSTEM_INFO]
    _GetNativeSystemInfo.restype = None
    si = SYSTEM_INFO()
    _GetNativeSystemInfo(ctypes.byref(si))
 
    return si
 
pGNSI = ctypes.windll.kernel32.GetProcAddress(
    ctypes.windll.kernel32.GetModuleHandleA('kernel32'),
    'GetNativeSystemInfo')
 
# Call GetNativeSystemInfo if supported or GetSystemInfo otherwise
if pGNSI:
  si = GetNativeSystemInfo()
else:
  si = GetSystemInfo()
 
print('Processor architecture: {}'.format(si.union.struct.wProcessorArchitecture))
 
'''
# x86
PROCESSOR_ARCHITECTURE_INTEL = 0
# Intel Itanium-based
PROCESSOR_ARCHITECTURE_IA64 = 6
# AMD/Intel x64
PROCESSOR_ARCHITECTURE_AMD64 = 9
# x86 emulator (WOW64)
PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 = 10
# Neutral
PROCESSOR_ARCHITECTURE_NEUTRAL = 11
# Unknown architecture
PROCESSOR_ARCHITECTURE_UNKNOWN = 0xFFFF
'''