主要流程：

1、向系统注册一个或者多个原始输入设备

2、在你注册的原始输入设备数据发生变化时，系统发送一个消息及新数据到你的进程

3、调用GetRawInputData或者GetRawInputBuffer来获取这些数据



简单修改了下，把一些不需要的信息去掉了，把头文件稍微改了下，因为有些人的SDK有点旧。然后加了当前键盘焦点窗口判断（很简单的实现，但是用起来很方便：）。

-main processes : 1, the registration system to one or more original input device 2, You registered in the original input data equipment changes, the system sends a message and the new data to your process 3, GetRawInputData or call to obtain this GetRawInputBuffer some simple modification of the data, some of the information need not remove the head slightly changed the document, because some of the SDK bit. Then increasing the current keyboard focus window judgment (realization of a simple, but very convenient to use up :).