python2.5问题中的异常记录

Question

我使用的是Python2.5&下面的代码产生2个错误。 有人能帮我吗？你知道吗

class EXCEPTION_RECORD(Structure):
    _fields_ = [
        ("ExceptionCode", DWORD),
        ("ExceptionFlags", DWORD),
        ("ExceptionRecord", POINTER(EXCEPTION_RECORD)),
        ("ExceptionAddress", LPVOID),
        ("NumberParameters", DWORD),
        ("ExceptionInformation", ULONG_PTR * EXCEPTION_MAXIMUM_PARAMETERS)]

Python错误：

Traceback (most recent call last):
  File "E:\Python25\my_debugger_defines.py", line 70, in <module>
    class EXCEPTION_RECORD(Structure):
  File "E:\Python25\my_debugger_defines.py", line 74, in EXCEPTION_RECORD
    ("ExceptionRecord", POINTER(EXCEPTION_RECORD)),
NameError: name 'EXCEPTION_RECORD' is not defined

Microsoft文档：

The EXCEPTION_RECORD structure describes an exception. 

typedef struct _EXCEPTION_RECORD { // exr  
    DWORD ExceptionCode; 
    DWORD ExceptionFlags; 
    struct _EXCEPTION_RECORD *ExceptionRecord; 
    PVOID ExceptionAddress; 
    DWORD NumberParameters; 
    DWORD ExceptionInformation[EXCEPTION_MAXIMUM_PARAMETERS]; 
} EXCEPTION_RECORD; 

提前谢谢

Answer 1

显然，在定义类时不能引用类类型，例如：

>>> class C:
    f = C



Traceback (most recent call last):
  File "<pyshell#17>", line 1, in <module>
    class C:
  File "<pyshell#17>", line 2, in C
    f = C
NameError: name 'C' is not defined

但是，您可以通过执行以下操作来解决此问题：

>>> class C:
    pass

>>> C.f = C    

我将重新编写您的代码，如下所示：

class EXCEPTION_RECORD(Structure):
    pass

EXCEPTION_RECORD._fields_ = [
        ("ExceptionCode", DWORD),
        ("ExceptionFlags", DWORD),
        ("ExceptionRecord", POINTER(EXCEPTION_RECORD)),
        ("ExceptionAddress", LPVOID),
        ("NumberParameters", DWORD),
        ("ExceptionInformation", ULONG_PTR * EXCEPTION_MAXIMUM_PARAMETERS)]