这个是什么错误提示
EX40Dlg.obj : error LNK2001: unresolved external symbol "protected: void __thiscall CEX40Dlg::OnChangeEditName(void)" (?OnChangeEditName@CEX40Dlg@@IAEXXZ)
Debug/EX40.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
EX40.exe - 2 error(s), 0 warning(s)
