我正在尝试使用Windows API在Windows 10中创建一个新的注册表项,即RegCreateKeyEx
函数,然后使用GetSecurityInfo
获取其DACL。所有断言都顺利进行,直到我说到GetSecurityInfo
函数调用,这会产生无效的句柄值错误(错误6)。我究竟做错了什么?
这是一个更复杂的项目的一部分,所以我只给出(或我认为它,但我可以添加其余的)相关部分:
RegCreateKeyEx
的包装器,使输出更容易使用并设置遇到的任何错误:
inline extern auto RegCreateKeyEx_safe(
_In_ const HKEY hKey,
_In_ const LPCTSTR lpSubKey,
_Reserved_ const DWORD Reserved,
_In_opt_ const LPTSTR lpClass,
_In_ const DWORD dwOptions,
_In_ const REGSAM samDesired,
_In_opt_ const LPSECURITY_ATTRIBUTES lpSecurityAttributes,
_Out_ const PHKEY phkResult,
_Out_opt_ const LPDWORD lpdwDisposition)
{
const auto result =
RegCreateKeyEx(
hKey,
lpSubKey,
Reserved,
lpClass,
dwOptions,
samDesired,
lpSecurityAttributes,
phkResult,
lpdwDisposition);
if (result != ERROR_SUCCESS)
SetLastError(result);
return result == ERROR_SUCCESS;
}
上述函数的包装器,它应该在检查它是否有效后返回创建的键的句柄:
inline extern auto CreateNewRegKey(
HKEY hKey,
LPCTSTR lpSubKey,
DWORD Reserved,
LPTSTR lpClass,
DWORD dwOptions,
REGSAM samDesired,
LPSECURITY_ATTRIBUTES lpSecurityAttributes,
LPDWORD lpdwDisposition)
{
auto createdKey = static_cast<PHKEY>(malloc(sizeof HKEY));
assert(
RegCreateKeyEx_safe(
hKey,
lpSubKey,
Reserved,
lpClass,
dwOptions,
samDesired,
lpSecurityAttributes,
createdKey,
lpdwDisposition));
assert(createdKey != INVALID_HANDLE_VALUE);
return createdKey;
}
和GetSecurityInfo
的包装,与RegCreateKey
版本相同的原因和功能:
inline extern auto GetSecurityInfo_safe(
_In_ const HANDLE handle,
_In_ const SE_OBJECT_TYPE ObjectType,
_In_ const SECURITY_INFORMATION SecurityInfo,
_Out_opt_ PSID* ppsidOwner,
_Out_opt_ PSID* ppsidGroup,
_Out_opt_ PACL* ppDacl,
_Out_opt_ PACL* ppSacl,
_Out_opt_ PSECURITY_DESCRIPTOR* ppSecurityDescriptor)
{
const auto result =
GetSecurityInfo(
handle,
ObjectType,
SecurityInfo,
ppsidOwner,
ppsidGroup,
ppDacl,
ppSacl,
ppSecurityDescriptor);
if (result != ERROR_SUCCESS)
SetLastError(result);
return result == EXIT_SUCCESS;
}
现在调用这些函数的代码如下:
const auto newRegKey =
CreateNewRegKey(
HKEY_CURRENT_USER,
SUBKEY_PATH,
NULL,
nullptr,
REG_OPTION_NON_VOLATILE,
KEY_ALL_ACCESS,
NULL, //securityAttributes,
nullptr);
assert(
GetSecurityInfo_safe(
newRegKey,
SE_REGISTRY_KEY,
DACL_SECURITY_INFORMATION,
NULL,
NULL,
oldDacl,
NULL,
NULL));
关于问题所在的输出非常清楚(我实现了一个稍微冗长的断言,在检查条件之后,它会打印它,以及错误文本以防条件失败):
SUCCESS: RegCreateKeyEx_safe( hKey, lpSubKey, Reserved, lpClass, dwOptions, samDesired, lpSecurityAttributes, createdKey, lpdwDisposition)
SUCCESS: createdKey != INVALID_HANDLE_VALUE
FAILURE: GetSecurityInfo_safe( newRegKey, SE_REGISTRY_KEY, DACL_SECURITY_INFORMATION, NULL, NULL, oldDacl, NULL, NULL)
ERROR-6: The handle is invalid.
断言:
#define _VERBOSE (1)
#define assert(cond) if((cond) == TRUE) \
{ if (_VERBOSE) cout << "SUCCESS:\t" << #cond << endl; } \
else \
{cout << "FAILURE:\t" << #cond << "\n\nERROR-" << GetLastError() << ":\t" << GetLastErrorAsString() << "\n\n"; exit(EXIT_FAILURE); }
先感谢您!
函数CreateNewRegKey
返回一个指向HKEY
的指针,它应该按值返回HKEY
。你将这个指针传递给GetSecurityInfo()
,它需要一个HANDLE
。编译器不会注意到因为HANDLE
被声明为typedef void *HANDLE;
。
要更正错误,请更正:
auto createdKey = static_cast<PHKEY>(malloc(sizeof HKEY));
同
HKEY createdKey = NULL;
并用RegCreateKeyEx_safe()
调用&createdKey
来传递HKEY
的地址。