I just contact with opc agreement, in writing when the client: according to the example to write http://blog.csdn.net/greston/article/details/34825241#cpp
, connect the opc service all have no questions,
On the traverse the OPC service Group, there was a problem:
Hr=m_pIServer - & gt; CreateGroupEnumerator (eScope IID_IEnumUnknown, (IUnknown * *) & amp; PEnum);
Hr is the return value is always S_FALSE; Opc great god what might be the problem?