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();
