谢谢指教。太深了，留此存档，以后慢慢体会。STATIC member VARIABLE 在COM中可以用吗？为什么在VC中用了STATIC MEMBER VARIABLE 后出现“error LNK2001: unresolved external symbol "private: static long CJobID::m_nID" (?m_nID@CJobID@@0JA)”？