fatal error LNK1120: 1 unresolved externals vc6.0 编译错错

MergerBmpView.obj : error LNK2001: unresolved external symbol "public: void __thiscall CMergerBmpView::SaveBmpToFile(char *,struct HBITMAP__ *)" (?SaveBmpToFile@CMergerBmpView@@QAEXPADPAUHBITMAP__@@@Z)
Debug/MergerBmp.exe : fatal error LNK1120: 1 unresolved externals
如何解决??万分感激!!