Classes for OPC DA Client Development
EasyDAClient- The EasyDAClient object is the main object that allows simple access to OPC DA servers.
DAVtq- This class holds the value, timestamp, and quality (also called VTQ, which is returned when an OPC item is read.
EasyDAItemChangedEventArgs- This class provides the data for the EasyDAClient.ItemChanged event
DAGroupParameters- This class contains subscription parameters, such as the requested update rate.
DAVtqResult- This class holds the result of an operation in the form of a DAVtq.
ServerDescriptor- This class contains information necessary to identify and connect to an OPC server, such as the server’s ProgID.
DAItemDescriptor- This class contains information necessary to identify an OPC item, such as its ItemID.
Classes for OPC A&E Client Development
EasyAEClient- The EasyAEClient object is the main object that allows simple access to OPC A&E servers.
AEEvent- Contains event notification information
AENodeElement- Contains information gathered about an OPC node (area or source in server’s area space)
AESubscriptionFilter- Contains the filtering criteria to be used for the event subscription
EasyAEClientParameters- Contains parameters that influence operations that target a specific OPC server as a whole
AEConditionState- Contains current state information about an OPC condition instance.
