Hi I'm trying to load a key from "HKLM\\SYSTEM\\CurrentControlSet\\Services\\Fax" but i'm getting error 5 (Access Denied). I'm not able to figure it out what is wrong with my code.


Here is my code

#include <windows.h>
#include <tchar.h>
#include <stdio.h>

BOOL SetPrivilege(
HANDLE hToken, // access token handle
LPCTSTR lpszPrivilege, // name of privilege to enable/disable
BOOL bEnablePrivilege // to enable or disable privilege
)
{
TOKEN_PRIVILEGES tp;
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) NULL,
(PDWORD) NULL) )
{
printf("AdjustTokenPrivileges error: %u\n", GetLastError() );
return FALSE;
}

if (GetLastError() == ERROR_NOT_ALL_ASSIGNED)

{
printf("The token does not have the specified privilege. \n");
return FALSE;
}

return TRUE;
}
void _tmain(int argc, TCHAR *argv[])
{

HKEY hKey;
LONG lErrorCode;
HANDLE ProcessToken;
LPCWSTR subkey = L"SYSTEM\\CurrentControlSet\\Services\\Fax";


if (OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &ProcessToken))
{

SetPrivilege(ProcessToken, SE_BACKUP_NAME, TRUE);
SetPrivilege(ProcessToken, SE_RESTORE_NAME, TRUE);
SetPrivilege(ProcessToken, SE_RESTORE_NAME, TRUE);

}


lErrorCode = RegOpenKeyEx(HKEY_LOCAL_MACHINE,subkey , 0, KEY_ALL_ACCESS, &hKey);
if (lErrorCode != ERROR_SUCCESS)
{
_tprintf(TEXT("Error in RegOpenKeyEx (%d).\n"), lErrorCode);
return;
}
else
{
_tprintf(TEXT("Key is successfully Opened\n"));
}

lErrorCode = RegSaveKey(hKey,L"c:\\load.reg",0);
if (lErrorCode != ERROR_SUCCESS)
{
_tprintf(TEXT("Error in RegSaveKey (%d).\n"), lErrorCode);
return;
}
else
{
_tprintf(TEXT("Key is successfully Saved \n"));
}

lErrorCode = RegLoadKey(HKEY_LOCAL_MACHINE,subkey,L"c:\\load.reg");
if (lErrorCode != ERROR_SUCCESS)
{
_tprintf(TEXT("Error in RegLoadKey (%d).\n"), lErrorCode);
return;
}
else
{
_tprintf(TEXT("Key is successfully loaded \n"));
}

lErrorCode = RegCloseKey(hKey);
if (lErrorCode != ERROR_SUCCESS)
{
_tprintf(TEXT("Error in closing the key (%d).\n"), lErrorCode);
return;
}
else
{
_tprintf(TEXT("Key is successfully closed \n"));
}
}


This is my OUTPUT

Key is successfully Opened
Key is successfully Saved
Error in RegLoadKey (5).