例程：视频播放程序VideoPlayer 说明： 本例程实现了视频播放的基本功能，包括打开音频文件、播放、停止、暂停以及拖动 进度条调整播放进度等。-Example: video player VideoPlayer Descr iption: This routine implements the basic functions of video playback, including open audio files, play, stop, pause, and drag t