实现位图文件的动画　它按照一定的次序播放一组相关位图-Bitmap File animation it according to a certain order of a group of related broadcast Bitmap

在屏幕上显示音量控制信息 调用Core Audio APIs 适应于vista win7-This sample uses the Core Audio APIs to implement an on-screen display that shows volume changes to the output stream that plays through the default audio-rendering endpoint device. The on-screen display a