说明：  利用键盘钩子开发按键发音程序。按键能发音，其关键就是让程序能够知道当前键盘上是哪个键被按下，并播放相应的声音,
(Pronunciation keys using the keyboard hook development program. Keys to pronunciation, the key is to let the program to know the current keyboard which key is pressed, and play the corresponding sound)