Question

我有一个定义结构的dll。在此结构中，字段的类型为CRITICAL_SECTION，包含在windows.h中。如何在python中定义ctypes结构来引用这种类型？由于CRITICAL_SECTION本身就是一个结构（在其自己的定义中引用了其他结构），我真的必须定义python ctype等价物，这样我才能引用python CRITICAL_SECTION吗？还有更好的方法吗？

示例C程序：

...
typedef struct some_struct {
    ...
    CRITICAL_SECTION field1;
} SOME_STRUCT;
...

示例Python程序：

...
class SOME_STRUCT(Structure):
    _fields_ = [... ('field1', CRITICAL_SECTION)]

如何让ctypes识别CRITICAL_SECTION是什么，而不是将所有内容定义为ctypes识别的原始类型？

Answer 1

您必须正确地获得顶级结构大小。 InitializeCriticalSection应该处理设置结构。

查看Windows标头，这应该适用于32位和64位系统：

from ctypes import *
from ctypes import wintypes as w

# Set to an unsigned int type that is 32- or 64-bit depending on OS architecture.
# I didn't see a wintype that worked.
ULONG_PTR = c_size_t

class CRITICAL_SECTION(Structure):
    _fields_ = [('DebugInfo',w.LPVOID),
                ('LockCount',w.LONG),
                ('RecursionCount',w.LONG),
                ('OwningThread',w.HANDLE),
                ('LockSemaphore',w.HANDLE),
                ('SpinCount',ULONG_PTR)]

k32 = WinDLL('kernel32')
InitializeCriticalSection = k32.InitializeCriticalSection
InitializeCriticalSection.argtypes = POINTER(CRITICAL_SECTION),
InitializeCriticalSection.restype = None

s = CRITICAL_SECTION()
InitializeCriticalSection(byref(s))

定义具有未知字段类型的python ctypes结构

1 个答案: