hi guys, im current having problem in exporting dll, e.i, i want to export my dll with gui and its class functions. currently i can export a dll like this:

#ifdef Q_WS_WIN
#define MY_DLL __declspec(dllexport)
#else
#define MY_DLL
#endif

extern "C" MY_DLL int sum(int a, int b)
{
return (a + b);
}
now my question is, how can i export dll with gui as well as its class functions? many thnks