1。如果vb是OCX，则会自动生成封装类
2。一般的DLL 
CoInitialize(NULL);
    _clsNewDentalEditor *p;
    HRESULT ht = CoCreateInstance(CLSID_clsNewDentalEditor, NULL, CLSCTX_INPROC_SERVER,   IID__clsNewDentalEditor, (void **)&p);
 CComVariant Param1, Param2, Param3, Param4;
 ht = p->Exec(&Param1, &Param2, &Param3, &Param4);
   CoUninitialize();