'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).