'Declaration
 
<ExtensionAttribute()>
Public Overloads Shared Function GetPropertyValueInt64( _
   ByVal client As IEasyDAClient, _
   ByVal machineName As String, _
   ByVal serverClass As String, _
   ByVal itemId As String, _
   ByVal propertyDescriptor As DAPropertyDescriptor _
) As Long

'Usage
 
Dim client As IEasyDAClient
Dim machineName As String
Dim serverClass As String
Dim itemId As String
Dim propertyDescriptor As DAPropertyDescriptor
Dim value As Long
 
value = IEasyDAClientExtension2.GetPropertyValueInt64(client, machineName, serverClass, itemId, propertyDescriptor)

[Extension()]
public static long GetPropertyValueInt64( 
   IEasyDAClient client,
   string machineName,
   string serverClass,
   string itemId,
   DAPropertyDescriptor propertyDescriptor
)

[Extension()]
public:
static int64 GetPropertyValueInt64( 
   IEasyDAClient^ client,
   String^ machineName,
   String^ serverClass,
   String^ itemId,
   DAPropertyDescriptor^ propertyDescriptor
) 

Parameters

client

The client object that will perform the operation.

This is typically the OpcLabs.EasyOpc.DataAccess.EasyDAClient object.

The value of this parameter cannot be null (Nothing in Visual Basic).

machineName

Name of the machine. Determines the computer on which the OPC server is located. It may be an empty string, in which case the OPC server is assumed to exist on the local computer or at the computer specified for it by DCOM configuration.

The value represents a UNC or DNS computer name. Any string can be passed to this parameter (i.e. will not cause System.ArgumentException), but not all values make sense and will work when an operation using them is attempted. IPv6 addresses are normally enclosed between '[' and ']'.

The value of this parameter cannot be null (Nothing in Visual Basic).

serverClass

Contains ProgID of the OPC server to read from.

The value of this parameter cannot be null (Nothing in Visual Basic).

itemId

The Item ID of the OPC item involved in the operation.

The value of this parameter cannot be null (Nothing in Visual Basic).

propertyDescriptor

The property descriptor of the OPC property being obtained.

Because the OpcLabs.EasyOpc.DataAccess.DAPropertyDescriptor has an implicit conversion from System.Int64, OpcLabs.EasyOpc.DataAccess.DAPropertyIds, System.Xml.XmlQualifiedName, System.String, OpcLabs.EasyOpc.DataAccess.DAPropertyId and OpcLabs.EasyOpc.DataAccess.AddressSpace.DAPropertyElement, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a such values in place of this parameter, and the corresponding OPC DA property descriptor will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the FromInt64, FromDAPropertyIds, FromXmlQualifiedName, FromDAPropertyId or FromDAPropertyElementstatic method instead.

The value of this parameter cannot be null (Nothing in Visual Basic).

Return Value

The server(s) can be local or can be remotely accessed via DCOM.

This is an extension method (info: C#, VB.NET). In languages that have support for extensions methods (such as C# and VB.NET), you can use the extension method as if it were a regular method on the object that is its first parameter. In other languages (such as with Python.NET), you will call the extension as a static method, and pass it the object on which it acts as its first parameter.

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