本实例应用realone类实现单文档结构的视图窗体中播放拓展名为.rm的文件，通过菜单操作来控制文件的播放，提供增大音量，减少音量，快进，快退功能-This class implements a single instance of application realone document structure to expand the view of the form players named. Rm files through menu operation to control the p