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错误 LNK2019 无法解析的外部符号 "public: virtual class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl cv::xfeatures2d::VGG::getDefaultName(void)const " (?getDefaultName@VGG@xfeatures2d@cv@@UEBA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ),函数 "[thunk]:public: virtual class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl cv::xfeatures2d::VGG::getDefaultName`vtordisp{4294967292,0}' (void)const " (?getDefaultName@VGG@xfeatures2d@cv@@$4PPPPPPPM@A@EBA?AV?$ba