Read one or more items in a group. The results are returned via the client's
IOPCcallback connection established through the server's IConnectionPointContainer.
Reads are from 'DEVICE' and are not affected by the ACTIVE state of the group
or item. ( IOPCAsyncIO2::Read )
Syntax
Parameters
- arrHSrv
- Array of server item handles of the items to be read
- transactionID
- The Client generated transaction ID. This is included in
the 'completion' information provided to the OnReadComplete.
- cancelID
- Place to return a Server generated ID to be used in case the operation needs to be canceled.
- arrErr
Return Value
HRESULT success/error code
Requirements
Target Platforms: Windows 7/8/10, Windows Server 2003/2008/2012/2016, .NET 4.x
See Also