C++ – How to resolve “error LNK2019: unresolved external symbol”?

c++linkerstatic-librariesvisual-c++

I've got this MFC application I'm working on that needs to have an embedded database. So I went hunting for a slick, fast "embeddable" database for it and stumbled accross SQLite.

I created a DB with it, and I created a static library project with Visual Studio 2008. the library project will be used in another main project.

In the library project, I created a class DBClass with a method AddFeedToDB(CFeed f). The library project uses the .lib file from codeproject (cppsqlite3.lib).

When compiling the static library, no error is detected, but when I try to use the library project file in the main project, I get these type of errors:

error LNK2019: unresolved external symbol "public:void __thiscall
   CppSQLite3DB::close(void)" (?close@CppSQLite3DB@@QAEXXZ 
   referenced in function "public: int __thiscall
   CTalkingFeedsDB::AddFeedToDB(class CFeed,char const*)" (?
   AddFeedToDB@CTalkingFeedsDB@@QAEHVCFeed@@PDB@Z

What am I missing?

Best Solution

I know it is already 2 years since this question... but i run in the same situation here. Added all the header files... added the lib directories.. and keep having this error. So i added manually the lib to the Configuration Properties -> Linker -> Input -> Aditional Dependencies and all works for me.