HMODULE hDll = CoLoadLibrary(<lib name>);
   m_fpDllGetClassObject = (DLLGETCLASSOBJECT)GetProcAddress(hDll, "DllGetClassObject");
   CComPtr<IClassFactory> pCf;
   CLSID clsid;
   CLSIDFromString(L"{guid of the class}", &clsid);
   m_fpDllGetClassObject(clsid, IID_ClassFactory, (LPVOID*)&pCf);
   pCf->CreateInstance(...);
   ...