求教

ljf22222

本人做Pro/E二次开发的时候用到了函数ProUtilCollectSolidSurfaces（），加了头文件#include "UtilCollect.h"；

但编译的时候出现如下错误:
IntfExp error LNK2019: unresolved external symbol "enum ProErrors __cdecl ProUtilCollectSolidSurfaces(struct sld_part *,struct geom * * *)" ([email=?ProUtilCollectSolidSurfaces@@YA?AW4ProErrors@@PAUsld_part@@PAPAPAUgeom@@@Z]?ProUtilCollectSolidSurfaces@@YA?AW4ProErrors@@PAUsld_part@@PAPAPAUgeom@@@Z[/email]) referenced in function "void __cdecl ShowAllSurfaces(class CTreeCtrl &,struct _TREEITEM *)" ([email=?ShowAllSurfaces@@YAXAAVCTreeCtrl@@PAU_TREEITEM@@@Z]?ShowAllSurfaces@@YAXAAVCTreeCtrl@@PAU_TREEITEM@@@Z[/email])


请教高手是什么原因？

Easy2009