Catch and disable Sleep and Win L buttons

DWORD BadVKCodes[] = { VK_MENU, VK_PAUSE, VK_PRINT, VK_EXECUTE, VK_SNAPSHOT,
                       VK_HELP, VK_LWIN, VK_RWIN, VK_APPS, VK_SLEEP, VK_F1,
                       VK_BROWSER_SEARCH, VK_BROWSER_FAVORITES, VK_BROWSER_HOME,
                       VK_VOLUME_MUTE, VK_VOLUME_DOWN, VK_VOLUME_UP,
                       VK_MEDIA_NEXT_TRACK, VK_MEDIA_PREV_TRACK, VK_MEDIA_STOP,
                       VK_LAUNCH_MAIL, VK_LAUNCH_MEDIA_SELECT, VK_LAUNCH_APP1, VK_LAUNCH_APP2,
                       VK_ICO_HELP, VK_PROCESSKEY, VK_PACKET };

LRESULT CALLBACK LowLevelKeyboardHookProcedure(int nCode, WPARAM wParam, LPARAM lParam)
{
    if (nCode < 0 || g_hWnd == NULL) // g_hWnd is my global window handle
    {
        return CallNextHookEx(NULL, nCode, wParam, lParam);
    }

    KBDLLHOOKSTRUCT *khs = reinterpret_cast<KBDLLHOOKSTRUCT *>(lParam);
    const int VKCodesCount = _countof(BadVKCodes);

    if ((khs->flags & LLKHF_ALTDOWN) == LLKHF_ALTDOWN)
    {
        // ALT key is down, do not want system messages, eat it
        return 1;
    }

    if (std::find(BadVKCodes, BadVKCodes + VKCodesCount, khs->vkCode) != BadVKCodes + VKCodesCount)
    {
        // vkCode is a bad code, eat it
        return 1;
    }

    return CallNextHookEx(NULL, nCode, wParam, lParam);
}