The purpose of the GetStatus service is:
- It provides a common mechanism for checking the status of the server - whether it is operational or in need of maintenance.
- It provides a common mechanism for obtaining vendor-specific information about the server that is not available through the other OPC services (version number, etc).
- Provides insight for clients as to the relative time synchronization between the client and server. As an example, this information is useful for Read requests.
Syntax
| Visual Basic (Usage) |  Copy Code |
|---|---|
Dim instance As OpcXmlDA Dim LocaleID As String Dim ClientRequestHandle As String Dim callback As AsyncCallback Dim asyncState As Object Dim value As IAsyncResult value = instance.BeginGetStatus(LocaleID, ClientRequestHandle, callback, asyncState) | |
| C# | |
|---|---|
public IAsyncResult BeginGetStatus( string LocaleID, string ClientRequestHandle, AsyncCallback callback, object asyncState ) | |
Parameters
- LocaleID
- An optional value supplied by the client that specifies the language for textual status data.
- ClientRequestHandle
- An optional value supplied by the client that will be returned with the response. In larger and more complex systems it helps the client to associate the replies with the proper requests.
- callback
- Delegate of the method to be called when the asynchronous operation is completed.
- asyncState
- A user-provided object that distinguishes this particular asynchronous request from other requests.
Return Value
An object that supports the IAsyncResult interface stores state information for an asynchronous operation, and provides a synchronization object to allow threads to be signaled when the operationRequirements
Target Platforms:Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows 7, Windows Server 2008 family
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