MouseWheel Event

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

using namespace std;

HHOOK hHock = NULL;
LRESULT CALLBACK LowLevelMHook( int nCode , WPARAM wParam , LPARAM lParam);

int WINAPI main(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdParam, int iCmdShow)
{
    MSG msg;

    hHock = SetWindowsHookEx(WH_MOUSE_LL, LowLevelMHook , 0,0);

    while(!GetMessage(&msg, 0, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    UnhookWindowsHookEx(hHock);
    return 0;
}

LRESULT CALLBACK LowLevelMHook ( int nCode , WPARAM wParam , LPARAM lParam)
{
    MSLLHOOKSTRUCT LLMouseStruct = *(MSLLHOOKSTRUCT*)lParam;
    if(wParam==WM_MOUSEWHEEL)
    {
        int MouseData = (int)LLMouseStruct.mouseData;
        if(MouseData < 0)
        {
            cout << "MW DOWN!\n";
        }
        else
        {
            cout << "MW UP!\n";
        }
    }
    return CallNextHookEx(hHock, nCode, wParam, lParam);
}