编译错误，求大虾解答
--------------------Configuration: CONNECT - Win32 Debug--------------------
Linking...
CONNNECT.OBJ : error LNK2001: unresolved external symbol "long __stdcall WndProc(struct HWND__ *,unsigned int,unsigned int,long)" (?WndProc@@YGJPAUHWND__@@IIJ@Z)
Debug/CONNECT.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

CONNECT.exe - 2 error(s), 0 warning(s)


[解决办法]
WndProc 这个没有实现？