求教

出现错误 :error LNK2001: unresolved external symbol __imp__PathFileExistsA@4
SearchFile.obj : error LNK2001: unresolved external symbol \"__declspec(dllimport) int __cdecl _findclose(long)\" (__imp_?_findclose@@YAHJ@Z)
SearchFile.obj : error LNK2001: unresolved external symbol \"__declspec(dllimport) int __cdecl _findnext(long,struct _finddata_t *)\" (__imp_?_findnext@@YAHJPAU_finddata_t@@@Z)
SearchFile.obj : error LNK2001: unresolved external symbol \"__declspec(dllimport) long __cdecl _findfirst(char const *,struct _finddata_t *)\" (__imp_?_findfirst@@YAJPBDPAU_finddata_t@@@Z)
Debug/usb.exe : fatal error LNK1120: 4 unresolved externals
Error executing link.exe.
可是我已经包含了相关的头文件了,
请问该如何解决

Project-settings-Link-Object/library modules:
加上:shlwapi.lib