試圖使用ctypes調用wincred api

我想使用ctypes API讀取Windows Credential Vault，但我不確定如何將函數結果轉回可用的ctypes.Structure。試圖使用ctypes調用wincred api

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

結果：

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

該函數返回true，所以它的工作原理，但指針內容似乎空白。我究竟做錯了什麼？

來源

2014-11-21 Stavr00

因爲它看起來像你在x86上在你的CREDENTIALS類型幫助中添加'_pack_ = 1'嗎？從ctypes.wintypes '從ctypes的進口結構，指針，WinDLL' '進口LPWSTR，DWORD，BOOL，FILETIME，LPVOID'： – Flexo 2014-11-22 11:05:59

oledll應該是windll。 oledll用於返回HRESULT的功能。

CREDENTIAL的定義缺少一些字段（LastWritten和Persist）。定義（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;

來源

2014-11-23 10:04:32

感謝您的幫助，我已經固定的結構定義使用WINDLL類型 – Stavr00 2014-11-24 15:45:15

試圖使用ctypes調用wincred api

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