OPC Labs EasyOPC “Classic” Components Library
EasyDAClient Object Members
Overview 
OpcLabs_EasyOpcClassicComponents ActiveX DLL : EasyDAClient Object
Public Methods
Public Method add_Disposed

 

DISPID (Dispatch ID):

 

For more information, see add_Disposed in .NET Reference.

Public Method BrowseAccessPathListBrowse for access paths, returning a list. Specify server descriptor, and node descriptor.

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.BrowseAccessPathList in .NET Reference.

Public Method BrowseAccessPathsBrowse for access paths. Specify server descriptor, and node descriptor.

 

DISPID (Dispatch ID):

 

For more information, see BrowseAccessPaths in .NET Reference.

Public Method BrowseBranchesBrowse for child branches. Specify machine name, and server class.

 

DISPID (Dispatch ID):

 

For more information, see BrowseBranches in .NET Reference.

Public Method BrowseLeavesBrowse for child leaves. Specify machine name, and server class.

 

DISPID (Dispatch ID):

 

For more information, see BrowseLeaves in .NET Reference.

Public Method BrowseNodesBrowse for child nodes. Specify server descriptor, parent item ID, and node filter.

 

DISPID (Dispatch ID):

 

For more information, see BrowseNodes in .NET Reference.

Public Method BrowsePropertiesBrowse for available item properties. Specify server descriptor, and node descriptor.

 

DISPID (Dispatch ID):

 

For more information, see BrowseProperties in .NET Reference.

Public Method BrowseServersBrowses the specified computer and returns information about OPC (Data Access) servers found.

 

DISPID (Dispatch ID):

 

For more information, see BrowseServers in .NET Reference.

Public Method ChangeItemSubscriptionChanges parameters of a subscription. Specify handle, and requested update rate.

 

DISPID (Dispatch ID):

 

For more information, see ChangeItemSubscription in .NET Reference.

Public Method ChangeItemSubscriptionListChanges parameters of subscriptions to multiple OPC items, using a list.

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.ChangeItemSubscriptionList in .NET Reference.

Public Method ChangeMultipleItemSubscriptionsChanges parameters of subscriptions to multiple OPC items.

 

DISPID (Dispatch ID):

 

For more information, see ChangeMultipleItemSubscriptions in .NET Reference.

Public Method CloneCreates a new object that is a copy of the current instance.

 

DISPID (Dispatch ID):

 

For more information, see Clone in .NET Reference.

Public Method Dispose

 

DISPID (Dispatch ID):

 

For more information, see Dispose in .NET Reference.

Public Method EqualsDetermines whether the specified object is equal to the current object.

 

DISPID (Dispatch ID):

 

For more information, see Equals in .NET Reference.

Public Method GetHashCodeReturns a hash code for the current object.

 

DISPID (Dispatch ID):

 

For more information, see GetHashCode in .NET Reference.

Public Method GetItemSubscriptionArgumentsObtains parameters of specified item subscription.

 

DISPID (Dispatch ID):

 

For more information, see GetItemSubscriptionArguments in .NET Reference.

Public Method GetMultiplePropertyValuesGets values of multiple OPC properties, specifying an array of property arguments objects.

 

DISPID (Dispatch ID):

 

For more information, see GetMultiplePropertyValues in .NET Reference.

Public Method GetObjectData

 

DISPID (Dispatch ID):

 

For more information, see GetObjectData in .NET Reference.

Public Method GetPropertyValueGets a value of OPC property, using individual parameters specifying the OPC server, and OPC Item ID.

 

DISPID (Dispatch ID):

 

For more information, see GetPropertyValue in .NET Reference.

Public Method GetPropertyValueListGets values of multiple OPC properties, specifying a list of property arguments objects.

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.GetPropertyValueList in .NET Reference.

Public Method GetServiceGets the service object of the specified type.

 

DISPID (Dispatch ID):

 

For more information, see GetService in .NET Reference.

Public Method GetServiceByNameGets the service object of the specified type, given by type name.

 

DISPID (Dispatch ID):

 

For more information, see GetServiceByName in .NET Reference.

Public Method GetTypeGets the Type of the current instance.

 

DISPID (Dispatch ID):

 

For more information, see GetType in .NET Reference.

Public Method IsKnownItemSubscriptionHandleDetermines whether the given item subscription handle is known to this client.

 

DISPID (Dispatch ID):

 

For more information, see IsKnownItemSubscriptionHandle in .NET Reference.

Public Method PullItemChangedAttempts to pull an OPC item change subscribed to by the SubscribeMultipleItems or SubscribeItem method.

 

DISPID (Dispatch ID):

 

For more information, see PullItemChanged in .NET Reference.

Public Method PullItemChangeListAttempts to pull multiple OPC item changes subscribed to by the SubscribeMultipleItems or SubscribeItem method, returning a list.

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.PullItemChangeList in .NET Reference.

Public Method PullMultipleItemChangesAttempts to pull multiple OPC item changes subscribed to by the SubscribeMultipleItems or SubscribeItem method.

 

DISPID (Dispatch ID):

 

For more information, see PullMultipleItemChanges in .NET Reference.

Public Method ReadItemReads a named item using individual parameters specifying its location, and using server's canonical data type.

 

DISPID (Dispatch ID):

 

For more information, see ReadItem in .NET Reference.

Public Method ReadItemListReads multiple named items, using list of argument objects as an input.

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.ReadItemList in .NET Reference.

Public Method ReadItemValueReads a value of named item using individual parameters specifying its location, using server's canonical data type.

 

DISPID (Dispatch ID):

 

For more information, see ReadItemValue in .NET Reference.

Public Method ReadItemValueListReads multiple named item values from a single OPC server, using list of argument objects as an input.

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.ReadItemValueList in .NET Reference.

Public Method ReadMultipleItemsReads multiple named items, using array of argument objects as an input.

 

DISPID (Dispatch ID):

 

For more information, see ReadMultipleItems in .NET Reference.

Public Method ReadMultipleItemValuesReads multiple named item values from a single OPC server, using array of argument objects as an input.

 

DISPID (Dispatch ID):

 

For more information, see ReadMultipleItemValues in .NET Reference.

Public Method remove_Disposed

 

DISPID (Dispatch ID):

 

For more information, see remove_Disposed in .NET Reference.

Public Method ResetSets the object properties back to their defaults.

 

DISPID (Dispatch ID):

 

For more information, see Reset in .NET Reference.

Public Method SubscribeItemSubscribe to OPC item. Specify machine name, server class, item ID, and requested update rate. No state object is specified (suitable for simple scenarios only).

 

DISPID (Dispatch ID):

 

For more information, see SubscribeItem in .NET Reference.

Public Method SubscribeItemListSubscribe to changes of multiple OPC items, using a list. The ItemChanged event will be generated for each significant item change. Callback methods will be invoked if they are specified in the argument objects.

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.SubscribeItemList in .NET Reference.

Public Method SubscribeMultipleItemsSubscribe to changes of multiple OPC items. The ItemChanged event will be generated for each significant item change. Callback methods will be invoked if they are specified in the argument objects.

 

DISPID (Dispatch ID):

 

For more information, see SubscribeMultipleItems in .NET Reference.

Public Method UnsubscribeAllItemsUnsubscribe from changes of all OPC items.

 

DISPID (Dispatch ID):

 

For more information, see UnsubscribeAllItems in .NET Reference.

Public Method UnsubscribeItemUnsubscribe from OPC item, specifying its handle.

 

DISPID (Dispatch ID):

 

For more information, see UnsubscribeItem in .NET Reference.

Public Method UnsubscribeItemListUnsubscribe from changes of multiple OPC items, specifying a list of integer handles.

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.UnsubscribeItemList in .NET Reference.

Public Method UnsubscribeMultipleItemsUnsubscribe from changes of multiple OPC items, specifying an array of integer handles.

 

DISPID (Dispatch ID):

 

For more information, see UnsubscribeMultipleItems in .NET Reference.

Public Method ValueEqualsDetermines whether this instance has the same value as a given other instance.

 

DISPID (Dispatch ID):

 

For more information, see ValueEquals in .NET Reference.

Public Method WaitForItemValueSubscribes to the specified OPC-DA item, and monitors its data until it has "good" quality, an error occurs, or the alloted time elapses.

 

DISPID (Dispatch ID):

 

For more information, see WaitForItemValue in .NET Reference.

Public Method WaitForMultipleItemValueListSubscribes to the specified OPC-DA items, using a list, and monitors their data until they have at least the quality specified for each item, an error occurs, or the alloted time elapses.

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.WaitForMultipleItemValueList in .NET Reference.

Public Method WaitForMultipleItemValuesSubscribes 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.

 

DISPID (Dispatch ID):

 

For more information, see WaitForMultipleItemValues in .NET Reference.

Public Method WriteItemWrites separately given value, timestamp and quality into a named item using individual parameters specifying its location, and a specific data type.

 

DISPID (Dispatch ID):

 

For more information, see WriteItem in .NET Reference.

Public Method WriteItemListWrites named items into an OPC server or OPC servers, using a list. Values, qualities and timestamps are written.

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.WriteItemList in .NET Reference.

Public Method WriteItemValueWrites a value into a named item using individual parameters specifying its location, and using server's canonical data type.

 

DISPID (Dispatch ID):

 

For more information, see WriteItemValue in .NET Reference.

Public Method WriteItemValueListWrites values into named items in an OPC server or OPC servers, using a list. Only the item values are written (qualities and timestamp are not written).

 

DISPID (Dispatch ID):

 

For more information, see OpcLabs.EasyOpc.DataAccess.ComTypes._EasyDAClient.WriteItemValueList in .NET Reference.

Public Method WriteMultipleItemsWrites named items into an OPC server or OPC servers. Values, qualities and timestamps are written.

 

DISPID (Dispatch ID):

 

For more information, see WriteMultipleItems in .NET Reference.

Public Method WriteMultipleItemValuesWrites values into named items in an OPC server or OPC servers. Only the item values are written (qualities and timestamp are not written).

 

DISPID (Dispatch ID):

 

For more information, see WriteMultipleItemValues in .NET Reference.

Public Properties
Public Property AliasProviderThe alias provider to be used for resolving aliases by this component.

 

DISPID (Dispatch ID):

 

For more information, see AliasProvider in .NET Reference.

Public Property CallbackQueueCapacityCapacity of the callback queue.

 

DISPID (Dispatch ID):

 

For more information, see CallbackQueueCapacity in .NET Reference.

Public Property CallbackQueueIdleTimeToSleepThe idle time before the internal thread executing the queued callbacks is stopped.

 

DISPID (Dispatch ID):

 

For more information, see CallbackQueueIdleTimeToSleep in .NET Reference.

Public Property CustomReferenceCan be used to distinguish otherwise equal widgets.

 

DISPID (Dispatch ID):

 

For more information, see CustomReference in .NET Reference.

Public Property DisplayStringThe display string for the current object.

 

DISPID (Dispatch ID): 0

 

For more information, see ToString in .NET Reference.

Public Property InstanceParametersContains parameters that influence the behavior of just this instance of the component.

 

DISPID (Dispatch ID):

 

For more information, see InstanceParameters in .NET Reference.

Public Property IsolatedSpecifies that you wish that the EasyDAClient object instance works with an "isolated" connection to the OPC server, i.e. one that is not shared with other instances.

 

DISPID (Dispatch ID):

 

For more information, see Isolated in .NET Reference.

Public Property IsolatedParametersContains parameters that influence the behavior of the component when it is isolated.

 

DISPID (Dispatch ID):

 

For more information, see IsolatedParameters in .NET Reference.

Public Property LicenseInfoProvides dictionary of license data fields and their values.

 

DISPID (Dispatch ID):

 

For more information, see LicenseInfo in .NET Reference.

Public Property PullItemChangedQueueCapacityCapacity of the event pull queue for item changes.

 

DISPID (Dispatch ID):

 

For more information, see PullItemChangedQueueCapacity in .NET Reference.

Public Property QueueCallbacksDetermines whether the component will deliver all callbacks in a queued manner.

 

DISPID (Dispatch ID):

 

For more information, see QueueCallbacks in .NET Reference.

Public Property Site

 

DISPID (Dispatch ID):

 

For more information, see Site in .NET Reference.

Public Property SupportedTechnologiesGets the OPC technologies supported.

 

DISPID (Dispatch ID):

 

For more information, see SupportedTechnologies in .NET Reference.

Public Property ToStringReturns a string that represents the current object.

 

DISPID (Dispatch ID):

 

For more information, see ToString in .NET Reference.

Events
Public Event EventingFailureRaised when a failure in the eventing infrastructure occurs.
Public Event ItemChangedRaised for every significant change in an OPC item subscribed to by the SubscribeItem method.
See Also

EasyDAClient Object

 

 

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