winforms - Linking error running a C++ program in Windows Forms -


some time ago made c++ program worked involving classes , main launched rest of application. need create graphic interface run program first idea build dll out of program , import windows forms application on visual studio 2008 turned not work.

i decided import code directly copied files folder inside project , wrote (gp_app old main , fwindow form @ new app)

gp_app.h

public ref class gp_app {     public: static int run_gp(); };

gp_app.cpp

public static int gp_app::run_gp(){    /* implementation */  }

fwindow.h

private: system::void button1_click(system::object^  sender, system::eventargs^  e) {              gp_app::run_gp();          }

but keeps giving me error when compile

fwindow.obj : error lnk2020: unresolved token (06000001) gp_app::run_gp

any idea solve it? or thinking should dll , how make work? ui windows pass parameters , showing terminal window running app. sorry if question dumb (i'm c++ rookie), sorry poor english , mistakes formatting question (couldn't format wanted code)


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