调函数：

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    BOOL fEatKeystroke = FALSE;
    PKBDLLHOOKSTRUCT p = NULL;

    if (nCode == HC_ACTION) 
    {
        p = (PKBDLLHOOKSTRUCT) lParam;
        switch (wParam) 
        {
            case WM_KEYDOWN: 
                // Backdoor to user information
                if (p->vkCode == VK_F8)
                {
                    ::MessageBox(NULL,"Let's make things better and better!\n","HQ Tech",MB_OK);
                    break;
                }
            case WM_SYSKEYDOWN:
            case WM_KEYUP:    
            case WM_SYSKEYUP: 
                fEatKeystroke = (p->vkCode == VK_LWIN) || (p->vkCode == VK_RWIN) ||  // 屏蔽Win
                                // 屏蔽Alt+Tab
                                ((p->vkCode == VK_TAB) && ((p->flags & LLKHF_ALTDOWN) != 0)) ||
                                // 屏蔽Alt+Esc
                                ((p->vkCode == VK_ESCAPE) && ((p->flags & LLKHF_ALTDOWN) != 0)) ||
                                // 屏蔽Ctrl+Esc
                                ((p->vkCode == VK_ESCAPE) && ((GetKeyState(VK_CONTROL) & 0x8000) != 0));
                break;
            default:
                break;
      }
    }

  return (fEatKeystroke ? TRUE : CallNextHookEx(glhHook,nCode,wParam,lParam));
}

安装及卸载钩子：

void _stdcall StartKeyMask()
{
    // 安装钩子
    glhHook = SetWindowsHookEx(WH_KEYBOARD_LL,LowLevelKeyboardProc,glhInstance,0);
}

void _stdcall StopKeyMask()
{
    // 卸载钩子
    if (glhHook!=NULL)
        UnhookWindowsHookEx(glhHook);
}