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
获得其DACL。所有的断言都进行得很顺利,直到我到达所说的GetSecurityInfo
函数调用为止,这给出了无效的句柄值错误(错误6)。我究竟做错了什么?
这是一个更详细的项目的一部分,因此我只在这里给出(或我认为是什么,但是我也可以添加其余的)相关部分:RegCreateKeyEx
的包装器,使输出更易于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;
}
上面函数的包装器,应在检查是否有效后返回创建键的句柄:
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;
}
以及
GetSecurityInfo
的包装器,其原因和功能与RegCreateKey
版本相同: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));
输出在问题出在哪里很明确(我实现了一个更详细的断言,即在检查条件之后,将其打印出来,并在条件失败的情况下显示错误文本):
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!
最佳答案
函数CreateNewRegKey
返回指向HKEY
的指针,该指针应按值返回HKEY
。您将此指针传递给GetSecurityInfo()
,而它需要一个HANDLE
。编译器不会注意到,因为HANDLE
被声明为typedef void *HANDLE;
。
要更正错误,请替换:
与
HKEY createdKey = NULL;
并使用
RegCreateKeyEx_safe()
调用&createdKey
以传递HKEY
的地址。关于c++ - 给出的C++ Windows API GetSecurityInfo无效句柄,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/48009227/