VirtualQueryEx 返回 ERROR_BAD_LENGTH (Python)

Question

我正在尝试执行 VirtualQueryEx 函数，但收到错误 24 (ERROR_BAD_LENGTH)，我无法弄清楚我做错了什么。这是我的代码（仅包括必要的部分）。

import ctypes as ct
from ctypes.wintypes import *


SIZE_T = ct.c_size_t
PVOID = LPVOID


class MEMORY_BASIC_INFORMATION(ct.Structure):
    _fields = (
        ("BaseAddress", PVOID),
        ("AllocationBase", PVOID),
        ("AllocationProtect", DWORD),
        ("PartitionId", WORD),
        ("RegionSize", SIZE_T),
        ("State", DWORD),
        ("Protect", DWORD),
        ("Size", DWORD),
    )


k32 = ct.WinDLL('kernel32')
VirtualQueryEx = k32.VirtualQueryEx
VirtualQueryEx.argtypes = HANDLE, LPCVOID, ct.POINTER(MEMORY_BASIC_INFORMATION), SIZE_T
VirtualQueryEx.restype = SIZE_T


info = MEMORY_BASIC_INFORMATION()
# proch comes from an OpenProcess call and the starting address I chose is one I picked from CheatEngine for testing.
bytes_returned = VirtualQueryEx(proch, 0x1408E125, ct.byref(info), ct.sizeof(info))
if bytes_returned == 0:
    print(f"Error occurred: {k32.GetLastError()}")
else:
    print(bytes_returned)

Answer 1

我不敢相信我错过了这个，但我把 _fields 而不是 _fields_ 放在 MEMORY_BASIC_INFORMATION 类中。更改后，它工作正常。