带ctype的ReadProcessMemory

Question

我在做一个小的单人教练。我不知道为什么ReadProcessMemory函数不起作用。通常它返回一个False或True，但在这种情况下什么也不返回。GetlastError（）给出了错误代码6。

#-*- coding: cp1252 -*-

import ctypes, win32ui, win32process ,win32api

PROCESS_ALL_ACCESS = 0x1F0FFF
HWND = win32ui.FindWindow(None,"Solitär").GetSafeHwnd()
print(HWND)
PID = win32process.GetWindowThreadProcessId(HWND)[1]
print(PID)
PROCESS = win32api.OpenProcess(PROCESS_ALL_ACCESS,0,PID).handle

rPM = ctypes.windll.kernel32.ReadProcessMemory
wPM = ctypes.windll.kernel32.WriteProcessMemory

ADDRESS1 = 0x00E97074
ADDRESS2 = ctypes.create_string_buffer(64)
pi = ctypes.pointer(ADDRESS2)
rPM(PROCESS,ADDRESS1,ADDRESS2,64,0)
print(ADDRESS2)
x=ctypes.windll.kernel32.GetLastError()
print(x)

Answer 1

查看MSDN ReadProcessMemory页面的社区注释，引用（sic）：

W7 wont run read process memory

You may need to check your access permissions for "SE_DEBUG_NAME" for the current processes token. If not enabled. Enabled it. This must be done as administrator of course.

还要完全声明返回类型并使用use_last_error参数，其中ctypes将在调用后直接在内部缓存GetLastError()值。否则，可能不正确。如果您在64位系统上，那么SIZE_T和指针是64位值，因此ctypes需要知道类型，以便为调用正确设置堆栈。

...
from ctypes import wintypes
...
rPM = ctypes.WinDLL('kernel32',use_last_error=True).ReadProcessMemory
rPM.argtypes = [wintypes.HANDLE,wintypes.LPCVOID,wintypes.LPVOID,ctypes.c_size_t,ctypes.POINTER(ctypes.c_size_t)]
rPM.restype = wintypes.BOOL
wPM = ctypes.WinDLL('kernel32',use_last_error=True).WriteProcessMemory
wPM.argtypes = [wintypes.HANDLE,wintypes.LPVOID,wintypes.LPCVOID,ctypes.c_size_t,ctypes.POINTER(ctypes.c_size_t)]
wPM.restype = wintypes.BOOL

ADDRESS1 = 0x00E97074
ADDRESS2 = ctypes.create_string_buffer(64)
bytes_read = ctypes.c_size_t()
print(rPM(PROCESS,ADDRESS1,ADDRESS2,64,ctypes.byref(bytes_read)))
print(ctypes.get_last_error())

另外，仅供参考，即使所有的修复都得到相同的错误值，但我没有经历启用SE_DEBUG_NAME的麻烦。

已解决

以下是问题所在：

PROCESS = win32api.OpenProcess(PROCESS_ALL_ACCESS,0,PID).handle

win32api.OpenProcess返回一个临时的PyHANDLE，该临时的PyHANDLE被销毁，并在检索到句柄后关闭句柄。

解决方法是使用：

PROCESS = win32api.OpenProcess(PROCESS_ALL_ACCESS,0,PID)
...
rPM(PROCESS.handle,ADDRESS1,ADDRESS2,64,0)

PROCESS然后保存PyHANDLE对象，句柄保持有效。