请告知为什么下面的AdjustTokenPrivileges
函数总是返回true,从而给出:“AdjustTokenPrivileges error 6”(即句柄无效)?
stackoverlow抱怨我没有解释这个
我不知道还有什么要补充的。我是c ++的新手。
HANDLE hToken;
OpenProcessToken(GetCurrentProcess, TOKEN_ADJUST_PRIVILEGES, &hToken);
SetPrivilege(hToken,L"SeBackupPrivilege",1 );
CloseHandle(hToken);
BOOL SetPrivilege(
HANDLE hToken, // access token handle
LPCTSTR lpszPrivilege, // name of privilege to enable/disable
BOOL bEnablePrivilege // to enable or disable privilege
)
{
TOKEN_PRIVILEGES oldtp; /* old token privileges */
TOKEN_PRIVILEGES tp;
DWORD dwSize = sizeof (TOKEN_PRIVILEGES);
LUID luid;
if ( !LookupPrivilegeValue(
NULL, // lookup privilege on local system
lpszPrivilege, // privilege to lookup
&luid ) ) // receives LUID of privilege
{
printf("LookupPrivilegeValue error: %u\n", GetLastError() );
return FALSE;
}
tp.PrivilegeCount = 1;
tp.Privileges[0].Luid = luid;
if (bEnablePrivilege)
tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
else
tp.Privileges[0].Attributes = 0;
// Enable the privilege or disable all privileges.
if ( !AdjustTokenPrivileges(
&hToken,
FALSE,
&tp,
sizeof(TOKEN_PRIVILEGES),
(PTOKEN_PRIVILEGES) &oldtp,
(PDWORD) &dwSize) )
{
printf("AdjustTokenPrivileges error: %u\n", GetLastError() ); //Get error 6 here (ie invalid handle)
return FALSE;
}
if (GetLastError() == ERROR_NOT_ALL_ASSIGNED)
{
printf("The token does not have the specified privilege. \n");
return FALSE;
}
return TRUE;
}
答案 0 :(得分:1)
您应该请求TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY
并正确调用该函数:
if (!OpenProcessToken(GetCurrentProcess(),
TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
return FALSE;
并请:始终检查有效的退货值!
有关完整示例,请参阅:How to Shut Down the System
仅供参考:您的功能SetPrivilege
已从Enabling and Disabling Privileges in C++
答案 1 :(得分:0)
&hToken -> hToken
if ( !AdjustTokenPrivileges(
hToken,
FALSE,
&tp,
sizeof(TOKEN_PRIVILEGES),
(PTOKEN_PRIVILEGES) &oldtp,
(PDWORD) &dwSize) )