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I'm trying to run the face detection example provided by dlib. I have set up my library directories and my include folders. I've included source.cpp in the project, and have added the files from the externals folder into it as well. When I run the program it said to enable jpeg support by defining jpeg support, which i did, but then it wont compile and provide 2 similar errors about an unresolved external.

unresolved external symbol "public: __thiscall dlib::jpeg_loader::jpeg_loader(class std::basic_string,class std::allocator > const &)" (??0jpeg_loader@dlib@@QAE@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function "void __cdecl dlib::load_jpeg > >(class dlib::array2d > &,class std::basic_string,class std::allocator > const &)" (??$load_jpeg@V?$array2d@EV?$memory_manager_stateless_kernel_1@D@dlib@@@dlib@@@dlib@@YAXAAV?$array2d@EV?$memory_manager_stateless_kernel_1@D@dlib@@@0@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) DLIBtemplate

This is my code header: 

#define DLIB_JPEG_SUPPORT
#include <dlib/image_processing/frontal_face_detector.h>
#include <dlib/gui_widgets.h>
#include <dlib/image_io.h>
#include <iostream>

using namespace dlib; using namespace std;

user2426860
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1 Answers1

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You have to define DLIB_JPEG_SUPPORT for all your .cpp files, not just one of them. You set it as a compiler setting in your project, not by writing #define in one file.

Davis King
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