有人知道这个报错吗
--------------------Configuration: 111 - Win32 Debug--------------------
Compiling...
111.cpp
Generating Code...
Skipping... (no relevant changes detected)
111View.cpp
Linking...
111View.obj : error LNK2001: unresolved external symbol "protected: void __thiscall CMy111View::OnFileOpen(void)" (?OnFileOpen@CMy111View@@IAEXXZ)
Debug/111.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
111.exe - 2 error(s), 0 warning(s)