OPC Studio User's Guide and Reference
PullMultipleEventNotifications Method (EasyUAClientCore)



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA Namespace > EasyUAClientCore Class : PullMultipleEventNotifications Method
Maximum number of event notifications returned.

Valid values of this parameter are in the range from 1 to 2147483647 (Int32.MaxValue).

The number of milliseconds to wait, or System.Threading.Timeout.Infinite (-1) to wait indefinitely.

Valid values of this parameter are in the range from -1 to 2147483647 (Int32.MaxValue).

Attempts to pull multiple OPC event notifications subscribed to by the SubscribeMultipleMonitoredItems or SubscribeEvent method.
Syntax
'Declaration
 
Public Function PullMultipleEventNotifications( _
   ByVal maximumCount As Integer, _
   ByVal millisecondsTimeout As Integer _
) As EasyUAEventNotificationEventArgs()
'Usage
 
Dim instance As EasyUAClientCore
Dim maximumCount As Integer
Dim millisecondsTimeout As Integer
Dim value() As EasyUAEventNotificationEventArgs
 
value = instance.PullMultipleEventNotifications(maximumCount, millisecondsTimeout)
public EasyUAEventNotificationEventArgs[] PullMultipleEventNotifications( 
   int maximumCount,
   int millisecondsTimeout
)

Parameters

maximumCount
Maximum number of event notifications returned.

Valid values of this parameter are in the range from 1 to 2147483647 (Int32.MaxValue).

millisecondsTimeout
The number of milliseconds to wait, or System.Threading.Timeout.Infinite (-1) to wait indefinitely.

Valid values of this parameter are in the range from -1 to 2147483647 (Int32.MaxValue).

Return Value

An array of event arguments, or null if no event is available within the specified time.

This method can return null (Nothing in Visual Basic).

The individual elements of the returned value are never null (Nothing in Visual Basic).

Exceptions
ExceptionDescription

The value of an argument is outside the allowable range of values as defined by the invoked method.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

See Also