QuickOPC User's Guide and Reference
GetPropertyValueInt64(IEasyDAClient,String,String,String,DAPropertyDescriptor) Method



OpcLabs.EasyOpcClassic Assembly > OpcLabs.EasyOpc.DataAccess.Extensions Namespace > IEasyDAClientExtension2 Class > GetPropertyValueInt64 Method : GetPropertyValueInt64(IEasyDAClient,String,String,String,DAPropertyDescriptor) Method
The client object that will perform the operation.
Name of the machine. Determines the computer on which the OPC server is located. 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.
Contains ProgID of the OPC server to read from.
The Item ID of the OPC item involved in the operation.
The property descriptor of the OPC property being obtained.
Gets a value of OPC property, using individual parameters specifying the OPC server, and OPC Item ID, and converts it to System.Int64.
Syntax
'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)

Parameters

client
The client object that will perform the operation.
machineName
Name of the machine. Determines the computer on which the OPC server is located. 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.
serverClass
Contains ProgID of the OPC server to read from.
itemId
The Item ID of the OPC item involved in the operation.
propertyDescriptor
The property descriptor of the OPC property being obtained.

Return Value

If successful, the function returns the actual value of the OPC property requested, converted to a type indicated by the method name.
Exceptions
ExceptionDescription
Thrown when the OPC operation fails.
A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.
Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2012, Windows Server 2016; .NET Core, .NET 5, .NET 6: Linux, macOS, Microsoft Windows

See Also

Reference

IEasyDAClientExtension2 Class
IEasyDAClientExtension2 Members
Overload List