How to Perform an Asynchronous Configuration Manager Query by Using WMI

Article
05/03/2011

Applies To: System Center Configuration Manager 2007, System Center Configuration Manager 2007 R2, System Center Configuration Manager 2007 R3, System Center Configuration Manager 2007 SP1, System Center Configuration Manager 2007 SP2

In Microsoft System Center Configuration Manager 2007, you perform an synchronous query for Configuration Manager objects by calling the SWbemServices object ExecQueryAsync method and by implementing a sink method to handle query results.

To handle each returned object, create an objWbemSink.OnObjectReady event subroutine. To be notified when the query is completed, create a objWbemSink.OnCompleted event subroutine.

Note

Lazy properties are not returned in asynchronous queries. For more information, see How to Read Lazy Properties by Using WMI.

To perform an asynchronous query

Set up a connection to the SMS Provider. For more information, see How to Connect to an SMS Provider in Configuration Manager by Using WMI.
Create an OnObjectReady subroutine to handle objects by the query.
Create an OnCompleted subroutine to handle query completion.
Using the SWbemServices object you obtain from step one, use ExecQueryAsync object to query Configuration Manager 2007 objects asynchronously.

Example

The following VBScript code example asynchronously queries for all SMS_Collection objects.

For information about calling the sample code, see Calling Configuration Manager Code Snippets.

Dim bdone
Sub QueryCollection(connection)

    Dim sink
    bdone = False

    Set sink = WScript.CreateObject("wbemscripting.swbemsink","sink_")

    
    ' Query for all collections.
    connection.ExecQueryAsync sink, "select * from SMS_Collection"

    ' Wait until all instances are returned.
    While Not bdone    
        wscript.sleep 1000
    Wend
 End Sub   

' The sink subroutine to handle the OnObjectReady 
' event. This is called as each object returns.
Sub sink_OnObjectReady(collection, octx)
    WScript.Echo "CollectionID: " + collection.CollectionID
    WScript.Echo "Name: " + collection.Name
    Wscript.Echo
End Sub

' The sink subroutine to handle the OnCompleted event.
' This is called when all the objects are returned. 
' The oErr parameter obtains an SWbemLastError object,
' if available from the provider.
Sub sink_OnCompleted(HResult, oErr, oCtx)
    WScript.Echo "All collections returned"
    bdone = true
End Sub

This example method has the following parameters:

Parameter	Type	Description
connection	SWbemServices	A valid connection to the SMS Provider.

Other Resources

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How to Perform an Asynchronous Configuration Manager Query by Using WMI

To perform an asynchronous query

Example

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