MFC"钩子“简单练习

    新建一个对话框工程，在OnInitDialog()接口中加入简单设置”鼠标钩子“和”键盘钩子“代码：
    

BOOL CHookDlg::OnInitDialog()
{
    CDialog::OnInitDialog();

    // Set the icon for this dialog. The framework does this automatically
    // when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);            // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon

    // TODO: Add extra initialization here
    hwnd = m_hWnd;
    hk_mouse = SetWindowsHookEx(WH_MOUSE, MouseProc, NULL, GetCurrentThreadId());
    hk_keyboard = SetWindowsHookEx(WH_KEYBOARD, KeyboardProc, NULL, GetCurrentThreadId());

    return TRUE; // return TRUE unless you set the focus to a control
}

    变量和接口定义：

// CHookDlg message handlers
HWND hwnd;
HHOOK hk_mouse;
HHOOK hk_keyboard;

LRESULT CALLBACK MouseProc( int nCode, WPARAM wParam, LPARAM lParam)
{
    UnhookWindowsHookEx(hk_mouse);    ///< 这样“钩子”就失效了
    return 1;
}

LRESULT CALLBACK KeyboardProc(int code, WPARAM wParam, LPARAM lParam)
{
    if (VK_SPACE == wParam || /*VK_RETURN == wParam ||*/
     (VK_F4 == wParam && (1 == (lParam >> 29) & 1)))    ///< “钩”空格键和Alt+F4
    {
        return 1;
    }
    else if (VK_ESCAPE == wParam)
    {
        ///< 向窗口发送关闭消息
        SendMessage(hwnd, WM_CLOSE, wParam, lParam);
        ///< 卸载钩子
        UnhookWindowsHookEx(hk_mouse);
        UnhookWindowsHookEx(hk_keyboard);
    }
    else
    {
        return CallNextHookEx(hk_keyboard,code,wParam,lParam);
    }
}

    至于编写对当前操作系统所有线程都起作用的钩子程序，可以练习练习；那一块需要了解动态链接库的操作等等；后面我想测试一个程序，获得登录qq时的密码......试试...