[Help Request] Address Read/Write Help

#include <iostream>
#include <Windows.h>

HANDLE hProcHandle;

int main()
{
	bool GameRunning = false;
	LPCSTR LGameWindow = "Call of Duty® Ghosts Multiplayer"; //Game Name, wichtig das er genau so wie der Window Titel ist
	
	while(!GameRunning)
	{
		HWND hGameWindow = NULL;
		DWORD ProcId = NULL;
		hProcHandle = NULL;
		GameRunning = false;

		hGameWindow = FindWindow(NULL, LGameWindow);

		system("cls");
		if(hGameWindow)
		{
			GetWindowThreadProcessId(hGameWindow, &ProcId);
			if(ProcId != 0)
			{
				hProcHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, ProcId);
				if(hProcHandle == INVALID_HANDLE_VALUE || hProcHandle == NULL)
				{
					std::cout << "Failed to open process for valid handle";
				}
				else
				{					
					std::cout << "Game Found!";
					GameRunning = true;
				}
			}
			else
			{
				std::cout << "Failed to obtain process id";
			}
		}
		else
		{
			std::cout << "Game not found!";
		}
	}

	DWORD AmmoAddress = 0x1443A5774;

	WriteProcessMemory(hProcHandle, (PBYTE*) AmmoAddress, "100", sizeof(int), 0);
}