QuickOPC User's Guide and Reference
ReadItemValueArrayOfChar(IEasyDAClient,String,String,String,Int32) Method



OpcLabs.EasyOpcClassic Assembly > OpcLabs.EasyOpc.DataAccess.Extensions Namespace > IEasyDAClientExtension2 Class > ReadItemValueArrayOfChar Method : ReadItemValueArrayOfChar(IEasyDAClient,String,String,String,Int32) 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.
Contains OPC item identifier.
Determines the age of value you would like to obtain (in milliseconds).
Reads a value of named OPC item, and converts it to an array of System.Char. The value is requested from the OPC server using a corresponding data type.
Syntax
'Declaration
 
<ExtensionAttribute()>
<NotNullAttribute()>
Public Overloads Shared Function ReadItemValueArrayOfChar( _
   ByVal client As IEasyDAClient, _
   ByVal machineName As String, _
   ByVal serverClass As String, _
   ByVal itemId As String, _
   ByVal valueAge As Integer _
) As Char()
'Usage
 
Dim client As IEasyDAClient
Dim machineName As String
Dim serverClass As String
Dim itemId As String
Dim valueAge As Integer
Dim value() As Char
 
value = IEasyDAClientExtension2.ReadItemValueArrayOfChar(client, machineName, serverClass, itemId, valueAge)
[Extension()]
[NotNull()]
public static char[] ReadItemValueArrayOfChar( 
   IEasyDAClient client,
   string machineName,
   string serverClass,
   string itemId,
   int valueAge
)
[Extension()]
[NotNull()]
public:
static array<char>^ ReadItemValueArrayOfChar( 
   IEasyDAClient^ client,
   String^ machineName,
   String^ serverClass,
   String^ itemId,
   int valueAge
) 

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
Contains OPC item identifier.
valueAge
Determines the age of value you would like to obtain (in milliseconds).

Return Value

Returns a value of the OPC item, converted to a type indicated by the method name.
Exceptions
ExceptionDescription
The OPC "Classic" (or OPC XML-DA) operation has failed.
A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.
The value of an argument is outside the allowable range of values as defined by the invoked method.
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