尝试使用ctypes调用wincred api

Question

我试图使用cTypesAPI读取Windows凭据保险库，但我不确定如何将函数结果转换回可用的ctypes.结构. 在

import ctypes
class CREDENTIALS(ctypes.Structure):
    _fields_ = [
        ("Flags", ctypes.c_int),
        ("Type", ctypes.c_int),
        ("TargetName", ctypes.c_wchar_p),
        ("Comment", ctypes.c_wchar_p),
        ("CredentialBlobSize", ctypes.c_int),
        ("CredentialBlob", ctypes.c_wchar_p),
        ("AttributeCount", ctypes.c_int),
        ("Attributes", ctypes.c_wchar_p),
        ("TargetAlias", ctypes.c_wchar_p),
        ("UserName", ctypes.c_wchar_p)
]
advapi32 = ctypes.oledll.LoadLibrary('Advapi32.dll')
advapi32.CredReadW.restype = ctypes.c_bool
advapi32.CredReadW.argtypes = [ctypes.c_wchar_p, ctypes.c_int, ctypes.c_int, ctypes.POINTER(CREDENTIALS)]
target = "login.example.com"
pcred = ctypes.pointer(CREDENTIALS())
ok = advapi32.CredReadW(target,1,0,pcred)
cred = pcred.contents
print ok, pcred, cred.UserName, cred.CredentialBlob

结果：

1 <__main__.LP_CREDENTIALS object at 0x012CECB0> None None

函数返回true，因此它可以工作，但指针内容似乎为空。我做错什么了？在

Answer 1

oledll应该是windll。oledll用于返回HRESULT的函数。在

CREDENTIAL的定义缺少一些字段（LastWritten和{}）。定义（link）是：

typedef struct _CREDENTIAL {
  DWORD                 Flags;
  DWORD                 Type;
  LPTSTR                TargetName;
  LPTSTR                Comment;
  FILETIME              LastWritten;
  DWORD                 CredentialBlobSize;
  LPBYTE                CredentialBlob;
  DWORD                 Persist;
  DWORD                 AttributeCount;
  PCREDENTIAL_ATTRIBUTE Attributes;
  LPTSTR                TargetAlias;
  LPTSTR                UserName;
} CREDENTIAL, *PCREDENTIAL;