连接的时候报错,帮我看看
--------------------Configuration: MyTest- Win32 Debug--------------------
Linking...
MyTest.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall CMyApp::ExitInstance(void)" (?ExitInstance@CMyApp@@UAEHXZ)
Debug/MyTest.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
超市管理.exe - 2 error(s), 0 warning(s)
怎么修改??