MFC编程出错提示：error LNK2001:
这是什么问题MFC编程出错提示：
abKC.obj : error LNK2001: unresolved external symbol "public: __thiscall CDataKC::CDataKC(void)" (??0CDataKC@@QAE@XZ)
TabKC.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall CDataKC::~CDataKC(void)" (??1CDataKC@@UAE@XZ)
../../rgri/bin/tes.exe : fatal error LNK1120: 2 unresolved externals
