ReadProcess Memory 299 on Windows 8 - c++

Question

I have this program that works perfectly in windows 7 but on windows 8 the readprocessmemory seems to be blank when I output it.Get Last error code 299. I Did not create this part of of program for read process but I use it because it was working for windows 7. The game handles and aria location are same on windows 8 machine, I double checked them. and The game handle is found. The address works fine in windows 7.
hGameWindow = FindWindow(L"WFElementClient Window",NULL);
if(hGameWindow) {
GetWindowThreadProcessId( hGameWindow, &dwProcId );
if( dwProcId != 0 ) {
hProcHandle = OpenProcess( PROCESS_ALL_ACCESS, FALSE, dwProcId );
if( hProcHandle == INVALID_HANDLE_VALUE || hProcHandle == NULL ) {
GameStatus = "Failed to open process for valid handle";
}else{
GameStatus = "Game Found";
myaddr = FindPointerAddr(hProcHandle, ariaBase, aOffset);
// IsGameAvail = true;
}
}
else GameStatus = "Failed to obtain process id";
}
else GameStatus = "game handle not found";
ReadProcessMemory(hProcHandle, (LPCVOID)myaddr, &buffer, sizeof(buffer), NULL);
int FindPointerAddr(HANDLE pHandle,int baseaddr, DWORD offsets[])
{
int Address = baseaddr;
int offset = 0;
int offsetCount = 5;
for (int i = 0; i < offsetCount; i++)
{
ReadProcessMemory(pHandle, (LPCVOID)Address, &Address , 4, NULL);
Address+=offsets[i];
}
return Address;
}

Answer 1

Security permissions have changed from Windows 7 to Windows 8.
You may need to run as administrator and set SeDebugPrivelage now, when you were not required to on previous versions of Windows. Such as when calling OpenProcess() with PROCESS_ALL_ACCESS because PROCESS_VM_READ requires SeDebugPrivelage
Here is how you set SeDebugPrivelage:
bool SetDebugPrivilege(bool Enable)
{
HANDLE hToken{ nullptr };
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, &hToken))
return false;
TOKEN_PRIVILEGES TokenPrivileges{};
TokenPrivileges.PrivilegeCount = 1;
TokenPrivileges.Privileges[0].Attributes = Enable ? SE_PRIVILEGE_ENABLED : 0;
if (!LookupPrivilegeValueA(nullptr, "SeDebugPrivilege", &TokenPrivileges.Privileges[0].Luid))
{
CloseHandle(hToken);
return false;
}
if (!AdjustTokenPrivileges(hToken, FALSE, &TokenPrivileges, sizeof(TOKEN_PRIVILEGES), nullptr, nullptr))
{
CloseHandle(hToken);
return false;
}
CloseHandle(hToken);
return true;
}