c++ - Problems importing a .lib into another project -

I am using Visual Studio 2008 under Windows 7. I have a .lib and together. The file is (which makes a difference if WxWidgets is compiled) without any issues.

I am trying to import that library into a GUI project, but when I do, can not I see the interest in the main category which I am interested in?

I have added #include "MyLib.h" to Guinea and added mylib.lib to those libraries, but for some The reason I get:

  MyLib.obj: error LNK2001: unknown external symbol "public: __thiscall MyLibClass :: MyLibClass (zero)" (?? 0MyLibClass @@ QAE @ XZ)  

Why can this happen?

Perhaps you are referring to the old version of the library? Are you certain that libraries connected to project settings are set on the right track?