open函数打开设备，准备音乐文件



play函数播放音乐，必须先打开设备



stop停止



pause暂停



close关闭设备



暂停播放后调用play函数恢复播放



支持MP3，wma，等格式-open function to open the device, ready to play music files, music function, you must first open the device stop stop pause pause pause close off the device function is called after play resumed playback support for MP3, wma, and other formats