Python ctypes-使用GetVersionEx函数获取0

说明：我正在尝试获取函数GetVersionEx的结果，但我始终在输出中获得“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：我怎样才能使这个函数工作并得到真正的结果

编辑：@eryksun在调用GetVersionExW函数之前，我做了以下操作：

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

输出为：452

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但是info的最终结果仍然是0

下面是一个调用以填充or记录的示例设置

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下面是一个调用以填充或记录的示例设置

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您正在调用GetVersion而不是。另外，您还没有正确定义结构；szCSDVersion字段应为WCHAR*128数组。您还没有按照文档中的说明设置DWOSVersionInfo字段，例如op.dwosVersionInfo=sizeofop_info。这是必需的，因为GetVersionExW还可以填充更大的结构。@eryksun好的，你说得对，如果我得到它，我会尽力让你知道，谢谢anyway@eryksun我不知道在哪里声明DWOSVersionInfoSize字段的值被分配给实例，而不是声明。您可以重写uuu init_uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu。另外，请注意，调用返回BOOL结果，如果调用失败，该结果将为false。在这种情况下，您可以根据上一个Windows错误引发ctypes.WinError以获取异常。您正在调用GetVersion而不是。另外，您还没有正确定义结构；szCSDVersion字段应为WCHAR*128数组。您还没有按照文档中的说明设置DWOSVersionInfo字段，例如op.dwosVersionInfo=sizeofop_info。这是必需的，因为GetVersionExW还可以填充更大的结构。@eryksun好的，你说得对，如果我得到它，我会尽力让你知道，谢谢anyway@eryksun我不知道在哪里声明DWOSVersionInfoSize字段的值被分配给实例，而不是声明。您可以重写uuu init_uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu。另外，请注意，调用返回BOOL结果，如果调用失败，该结果将为false。在这种情况下，您可以根据上一个Windows错误引发ctypes.WinError以获取异常。

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()