OPC Studio User's Guide and Reference
_EasyDAClient Interface Members
Properties  Methods 

OpcLabs.EasyOpcClassic Assembly > OpcLabs.EasyOpc.DataAccess.ComTypes Namespace : _EasyDAClient Interface

The following tables list the members exposed by _EasyDAClient.

Public Properties
 NameDescription
 PropertyThe alias provider to be used for resolving aliases by this component.  
 PropertyCapacity of the callback queue.  
 PropertyThe idle time before the internal thread executing the queued callbacks is stopped.  
 PropertyCan be used to distinguish otherwise equal widgets.  
 PropertyThe display string for the current object.  
 PropertyContains parameters that influence the behavior of just this instance of the component.  
 PropertySpecifies that you wish that the OpcLabs.EasyOpc.DataAccess.EasyDAClientCore object instance works with an "isolated" connection to the OPC server, i.e. one that is not shared with other instances.  
 PropertyContains parameters that influence the behavior of the component when it is isolated.  
 PropertyProvides dictionary of license data fields and their values.  
 PropertyCapacity of the event pull queue for item changes.  
 PropertyDetermines whether the component will deliver all callbacks in a queued manner.  
 PropertyGets the OPC technologies supported.  
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Public Methods
 NameDescription
 MethodBrowses the possible access paths of a specified OPC item. Specify server descriptor, and node descriptor.  
 MethodBrowses the possible access paths of a specified OPC item. Specify server descriptor, and node descriptor.  
 MethodBrowse for child branches. Specify machine name, and server class.  
 MethodBrowse for child leaves. Specify machine name, and server class.  
 MethodBrowses the specified branch (or root) in OPC server's address space, and returns information about child nodes (both branches and leaves) found. Specify server descriptor, parent item ID, and node filter.  
 MethodBrowse for available item properties of a specified OPC item. Specify server descriptor, and node descriptor.  
 MethodBrowses the specified computer and returns information about OPC (Data Access) servers found.  
 MethodChanges parameters of a subscription. Specify handle, and requested update rate.  
 MethodChanges parameters of subscriptions to multiple OPC items.  
 MethodChanges parameters of subscriptions to multiple OPC items.  
 Method  
 Method  
 Method  
 MethodObtains parameters of specified item subscription.  
 MethodGets values of multiple OPC properties, specifying an array of property arguments objects.  
 MethodGets a value of OPC property, using individual parameters specifying the OPC server, and OPC Item ID.  
 MethodGets values of multiple OPC properties, specifying an array of property arguments objects.  
 Method  
 MethodGets the service object of the specified type, given by type name.  
 Method  
 MethodDetermines whether the given item subscription handle is known to this client.  
 MethodAttempts to pull an OPC item change subscribed to by the OpcLabs.EasyOpc.DataAccess.IEasyDAClient.SubscribeMultipleItems or SubscribeItem method.  
 MethodAttempts to pull multiple OPC item changes subscribed to by the OpcLabs.EasyOpc.DataAccess.IEasyDAClient.SubscribeMultipleItems or SubscribeItem method.  
 MethodAttempts to pull multiple OPC item changes subscribed to by the OpcLabs.EasyOpc.DataAccess.IEasyDAClient.SubscribeMultipleItems or SubscribeItem method.  
 MethodReads a named item using individual parameters specifying its location, and using server's canonical data type.  
 MethodReads multiple named items from an OPC server or OPC servers, using array of argument objects as an input. Values, qualities and timestamps are returned.  
 MethodReads a value of named item using individual parameters specifying its location, using server's canonical data type.  
 MethodReads named items from an OPC server or OPC servers. Only the item values are returned (qualities and timestamps are not returned). Reads multiple named item values from a single OPC server, using array of argument objects as an input.  
 MethodReads multiple named items from an OPC server or OPC servers, using array of argument objects as an input. Values, qualities and timestamps are returned.  
 MethodReads named items from an OPC server or OPC servers. Only the item values are returned (qualities and timestamps are not returned). Reads multiple named item values from a single OPC server, using array of argument objects as an input.  
 MethodSets the object properties back to their defaults.  
 MethodSubscribe to OPC item. Specify machine name, server class, item ID, and requested update rate. No state object is specified (this overload is suitable for simple scenarios only).  
 MethodSubscribe to changes of multiple OPC items. The OpcLabs.EasyOpc.DataAccess.IEasyDAClient.ItemChanged event will be generated for each significant item change. Callback methods will be invoked if they are specified in the argument objects.  
 MethodSubscribe to changes of multiple OPC items. The OpcLabs.EasyOpc.DataAccess.IEasyDAClient.ItemChanged event will be generated for each significant item change. Callback methods will be invoked if they are specified in the argument objects.  
 Method  
 MethodUnsubscribe from changes of all OPC items.  
 MethodUnsubscribe from OPC item, specifying its handle.  
 MethodUnsubscribe from changes of multiple OPC items, specifying an "enumerable" of integer handles.  
 MethodUnsubscribe from changes of multiple OPC items, specifying an "enumerable" of integer handles.  
 MethodDefines a generalized method that classes must implement to create type-specific method for determining value equality of instances. Determines whether this instance has the same value as a given other instance.  
 MethodSubscribes to the specified OPC-DA item, and monitors its data until it has "good" quality, an error occurs, or the alloted time elapses.  
 MethodSubscribes to the specified OPC-DA items, and monitors their data until they have at least the quality specified for each item, an error occurs, or the alloted time elapses.  
 MethodSubscribes to the specified OPC-DA items, and monitors their data until they have at least the quality specified for each item, an error occurs, or the alloted time elapses.  
 MethodWrites separately given value, timestamp and quality into a named item using individual parameters specifying its location, and a specific data type.  
 MethodWrites named items into an OPC server or OPC servers. Values, qualities and timestamps are written.  
 MethodWrites a value into a named item using individual parameters specifying its location, and using server's canonical data type.  
 MethodWrites named items into an OPC server or OPC servers. Values, qualities and timestamps are written.  
 MethodWrites named items into an OPC server or OPC servers. Values, qualities and timestamps are written.  
 MethodWrites values into named items in an OPC server or OPC servers. Only the item values are written (qualities and timestamp are not written).  
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See Also

Reference

_EasyDAClient Interface
OpcLabs.EasyOpc.DataAccess.ComTypes Namespace