读取游戏手柄状态的demo。 利用窗口的Message(0x03a2)消息接收游戏摇杆的反馈，再利用JoyGetPos或者 JoyGetPosEx读取状态的demo程序 -Read Gamestick state demo. The use of window Message (0x03a2) message receiving game rocker feedback, re-use or JoyGetPos read JoyGetPosEx state demo program