int MRK3LINK_Open(void (*pfLog)(const char* s),void (*pfErrorOut)(const char* s));

static void _LogHandler(const char* sLog) {
   printf(sLog);
}

static void _ErrorOutHandler(const char* sError) {
   MessageBox(NULL, sError, "2-Link", MB_OK);
}

MRK3LINK_Open(_LogHandler, _ErrorOutHandler);