What is Wrong With My Code

#include <iostream>
#include <windows.h>

#define csgo "Counter-Strike: Global Offensive"
#define oAmmo 0x31FC
HANDLE Attach(LPCSTR wndName);
void Start(int memory, LPCSTR windowName);



int main()
{
	Start(oAmmo, csgo);

}

void Start(int memory, LPCSTR windowName)
{
	//attach window
	HANDLE hProc = Attach(windowName);
	if(hProc == NULL)
	{
		MessageBox(NULL, "Failed", NULL, MB_OK);
		return;
	}
	//*********************************************
	//					Fun Starts Here
	//*********************************************

	int Dat = 1337;

	
	if(!ReadProcessMemory(hProc, (LPVOID)memory, &Dat, sizeof(Dat), NULL))
	{
		std::cout << "Failed\n";
	}

	std::cout << Dat << std::endl;



	//close and stuff
	CloseHandle(hProc);
	Sleep(-1);
}

HANDLE Attach(LPCSTR wndName)
{
	HWND hack = FindWindow(NULL, wndName);
	
	if (hack == NULL)
	{
		MessageBox(NULL, "Could Not Find Window Invalid Name", NULL, MB_OK);
		return NULL;
	}

	DWORD proc_ID;
	GetWindowThreadProcessId(hack, &proc_ID);
	HANDLE hProc = OpenProcess(PROCESS_ALL_ACCESS, FALSE, proc_ID);
	if (!hProc)
	{
		MessageBox(NULL, "Could Not Find Process Try Again", NULL, MB_OK);
		return NULL;
	}
	return hProc;
}