Windows processor architecture via Windows API

win_proc_arch.py

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

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

class ProcessorArchitecture(IntEnum):
    # 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

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():
    # Call GetNativeSystemInfo if supported or GetSystemInfo otherwise
    SystemInfo = ctypes.windll.kernel32.GetSystemInfo

    if ctypes.windll.kernel32.GetProcAddress(
        ctypes.windll.kernel32.GetModuleHandleA('kernel32'),
        'GetNativeSystemInfo',
    ):
        SystemInfo = ctypes.windll.kernel32.GetNativeSystemInfo

    SystemInfo.argtypes = [LPSYSTEM_INFO]
    SystemInfo.restype = None
    si = SYSTEM_INFO()
    SystemInfo(ctypes.byref(si))

    return si

si = GetSystemInfo()

print('union.dwOemId', si.union.dwOemId)
print('union.struct.wProcessorArchitecture', si.union.struct.wProcessorArchitecture)
print('union.struct.wReserved', si.union.struct.wReserved)
print('dwPageSize', si.dwPageSize)
print('lpMinimumApplicationAddress', si.lpMinimumApplicationAddress)
print('lpMaximumApplicationAddress', si.lpMaximumApplicationAddress)
print('dwActiveProcessorMask', si.dwActiveProcessorMask)
print('dwNumberOfProcessors', si.dwNumberOfProcessors)
print('dwProcessorType', si.dwProcessorType)
print('dwAllocationGranularity', si.dwAllocationGranularity)
print('wProcessorLevel', si.wProcessorLevel)
print('wProcessorRevision', si.wProcessorRevision)
print()
print('Processor architecture: {}'.format({
    ProcessorArchitecture.PROCESSOR_ARCHITECTURE_AMD64: 'AMD/Intel x64',
    ProcessorArchitecture.PROCESSOR_ARCHITECTURE_IA32_ON_WIN64: 'x86 emulator (WOW64)',
    ProcessorArchitecture.PROCESSOR_ARCHITECTURE_IA64: 'Intel Itanium-based',
    ProcessorArchitecture.PROCESSOR_ARCHITECTURE_INTEL: 'x86',
    ProcessorArchitecture.PROCESSOR_ARCHITECTURE_NEUTRAL: 'Neutral',
    ProcessorArchitecture.PROCESSOR_ARCHITECTURE_UNKNOWN: 'Unknown',
}.get(si.union.struct.wProcessorArchitecture)))