音量设置/读取，VB调用API实现——对雄仔提供的代码做了一点修订(可真正读取音量。原版本http://www.pudn.com/downloads9/sourcecode/windows/detail35742.html)-Volume Set/Get, VB API calls to achieve- to provide for the 雄仔 did a little revision of the code (which can actually Get the volume. The