Python ctypes - 使用 GetVersionEx 函数获取 0

Question

说明:我正在尝试获取函数 GetVersionEx 的结果，但输出始终为“0”:

class op_info(Structure):
     _fields_ = [
        ('dwOSVersionInfoSize', DWORD),
        ('dwMajorVersion', DWORD),
        ('dwMinorVersion', DWORD),
        ('dwBuildNumber', DWORD),
        ('dwPlatformId', DWORD),
        ('szCSDVersion', DWORD)
     ]

def info():
    op = op_info()
    ctypes.windll.Kernel32.GetVersion(byref(op))
    return op.dwMajorVersion

print info()

问题:如何让这个功能发挥作用并得到真正的结果？

编辑:@eryksun 我在调用 GetVersionExW 函数之前做了这个:

 import sys
 op.dwOSVersionInfoSize = sys.getsizeof(op_info)

输出为:452

但是info()的最终结果还是0

Answer 1

这是调用 GetVersionExW 的示例设置填写 OSVERSIONINFO或 OSVERSIONINFOEX记录。

import ctypes
from ctypes.wintypes import BYTE, WORD, DWORD, WCHAR

kernel32 = ctypes.WinDLL('kernel32', use_last_error=True)

class OSVERSIONINFO(ctypes.Structure):
    _fields_ = (('dwOSVersionInfoSize', DWORD),
                ('dwMajorVersion',      DWORD),
                ('dwMinorVersion',      DWORD),
                ('dwBuildNumber',       DWORD),
                ('dwPlatformId',        DWORD),
                ('szCSDVersion',        WCHAR * 128))    
    def __init__(self, *args, **kwds):
        super(OSVERSIONINFO, self).__init__(*args, **kwds)
        self.dwOSVersionInfoSize = ctypes.sizeof(self)
        kernel32.GetVersionExW(ctypes.byref(self))

class OSVERSIONINFOEX(OSVERSIONINFO):
    _fields_ = (('wServicePackMajor', WORD),
                ('wServicePackMinor', WORD),
                ('wSuiteMask',        WORD),
                ('wProductType',      BYTE),
                ('wReserved',         BYTE))

def errcheck_bool(result, func, args):
    if not result:
        raise ctypes.WinError(ctypes.get_last_error())
    return args

kernel32.GetVersionExW.errcheck = errcheck_bool
kernel32.GetVersionExW.argtypes = (ctypes.POINTER(OSVERSIONINFO),)

def get_os_major_version():
    info = OSVERSIONINFO()
    return info.dwMajorVersion

if __name__ == '__main__':
    print get_os_major_version()