User`s guide

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OPC Interface of NuDAQ PCI card OPC Server

3.4 Custom Interface/Client Side

IOPCDataCallback

HRESULT OnReadComplete (dwTransid, hGroup, hrMasterquality,

hrMastererror, dwCount, phClientItems, pvValues, pwQualities,

pftTimeStamps, pErrors);

HRESULT OnWriteComplete (dwTransid, hGroup, hrMastererr, dwCount,

phClientItems, pErrors);

HRESULT OnCancelComplete (dwTransid, hGroup);

HRESULT OnDataChange (dwTransid, hGroup, hrMasterquality,

hrMastererror, dwCount, phClientItems, pvValues, pwQualities,

pftTimeStamps, pErrors);

IOPCShutdown

void ShutdownRequest (szReason);

IAdviseSink (old)

void OnDataChange (pFE, pSTM);

Note: all other functions can be stubs which return E_NOTIMPL.

About the detail of each method of interface, please refer to “OPC Data

Access Custom Interface Specification” manual on the OPC Foundation

website http://www.opcfoundation.org.