C++ Alternative to OpenProcess() (Program not willing to grant me permission) - c++

Question

I'm fairly new to C++ so my question is: Is there an alternative to OpenProcess()?The game does not let me get access to it, tried asking for smaller access than PROCESS_ACCESS_ALL since that might be a huge red flag. But here's my source code:
#include "stdafx.h"
#include <iostream>
#include <string.h>
#include <Windows.h>
int main()
{
HWND hWnd = FindWindow(NULL, "Growtopia");
if (hWnd == NULL)
{
std::cout << "ERROR: Unable to find window process" << std::endl;
Sleep(2500);
exit(-1);
}
DWORD pID;
GetWindowThreadProcessId(hWnd, &pID);
HANDLE hProc = OpenProcess(PROCESS_ALL_ACCESS, false, pID);
if (!hProc)
{
std::cout << "Error: Unable to gain access to window" << std::endl;
Sleep(2500);
exit(-1);
}
return 0;
}
PS: The game I'm trying to gain access to is Growtopia if you couldn't find it out by the FindWindow() function :)
Thanks in advance.
Edit: My purpouse of the program is to edit a value of an adress

Answer 1

My purpouse of the program is to edit a value of an adress
That requires the use of WriteProcessMemory(), which requires PROCESS_VM_WRITE and PROCESS_VM_OPERATION permissions to the target process:
HANDLE hProc = OpenProcess(PROCESS_VM_WRITE | PROCESS_VM_OPERATION, false, pID);
To open a process with those permissions, the calling thread needs the "SeDebugPrivilege" privilege enabled, which means it has to be running as a user that is allowed to obtain debug privileges, such as an admin.
Run your app as a debug user (or dynamically impersonate such a user), then use OpenThreadToken() to open the calling thread's current access token and adjust it with AdjustTokenPrivileges() to make sure the "SeDebugPrivilege" privilege is active, before then calling OpenProcess():
Changing Privileges in a Token
How to obtain a handle to any process with SeDebugPrivilege