How to Read and Write to the Configuration Manager Site Control File by Using WMI

In Configuration Manager, you write to the site control file using Windows Management Instrumentation (WMI) by using the SMS_SiteControlFile class methods.

When writing to the site control file by using WMI, you use a session handle to identify your application. This is used to manage concurrent updates to the file.

When you have finished writing to the site control file, you must commit your changes.

SMS_SiteControlFile has the following methods to manage changes to the site control file.

Method Description
CommitSCF Applies your changes to the Configuration Manager database.
RefreshSCF Refreshes your in-memory copy of the site control file with any recent changes from the Configuration Manager database.
GetSessionHandle Gets your in-memory copy of the site control file and a session handle. You place the session handle in an IWbemContext object that is passed to all IWbemServices methods.
ReleaseSessionHandle Releases your in-memory copy of the site control file and any resources associated with your session handle.


You should be experienced in managing a site's configuration before using the SMS Provider classes to modify the site configuration. You can cause great harm to a site by changing some configurable items. You should use extreme caution or avoid using the SMS_SCI_FileDefinition and SMS_SCI_SiteDefinition classes altogether. These classes manage the site control file itself. If you are not careful, you can render the site useless.

To write to the site control file

  1. Set up a connection to the SMS Provider. For more information, see SMS Provider fundamentals.

  2. Create a SWbemNameValue value set to hold your context data.

  3. Get a session handle from SMS_SiteControlFile class GetSessionHandle.

  4. Add the session handle to your context data.

  5. Call the SMS_SiteControlFile object RefreshSCF to get the latest copy of the site control file. Use the context data in the call.

  6. Query for the site control file resource you want to update using your context data.

  7. Update the resource using your context data.

  8. Commit your changes to the site control file using the SMS_SiteControlFile object CommitSCF method.

  9. Call the SMS_SiteControlFile object ReleaseSessionHandle method to release your session handle.


The following VBScript example access the client agent component of the site control file and creates a dummy property, property list and multi-string list. It then removes the updates that were made. The example demonstrates how to set up the session handle, get the site control file, query the site control file, make updates and commit changes to the site control file.

In the example, the LocaleID property is hard-coded to English (U.S.). If you need the locale for non-U.S. installations, you can get it from the SMS_Identification Server WMI Class LocaleID property.

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

Sub ReadWriteScf(connection, siteCode)  

    Dim context  
    Dim query  
    Dim resource  
    Dim resources  
    Dim inParams  

    Set context = CreateObject("WbemScripting.SWbemNamedValueSet")  

    ' Add the standard SMS context qualifiers to the context object.  
    context.Add "LocaleID", "MS\1033"  
    context.Add "MachineName", "MyMachine"  
    context.Add "ApplicationName", "MyApp"  

    ' Add the session handle.  
    context.Add "SessionHandle", _  
         connection.ExecMethod("SMS_SiteControlFile", "GetSessionHandle").SessionHandle  

   ' Load site control file.  
       Set inParams = connection.Get("SMS_SiteControlFile").Methods_("RefreshSCF").InParameters.SpawnInstance_  
InParams.SiteCode = siteCode  
connection.ExecMethod "SMS_SiteControlFile", "RefreshSCF", inParams, , context  

    ' Query for the client agent component.  
    query = "SELECT * FROM SMS_SCI_ClientComp " & _  
            "WHERE ClientComponentName = 'Client Agent' " & _  
           "AND SiteCode = '" & siteCode & "'"  

    Set resources = connection.ExecQuery(query, , , context)             

    For each resource in resources  

    ' Embedded property.  

        WScript.Echo "Embedded property"  
        Wscript.Echo "-----------------"  

        Dim value  
        Dim value1  
        Dim value2  

        Call WriteScfEmbeddedProperty(connection,context,resource,"Test2",20,"Hello","World")  

        If  GetScfEmbeddedProperty(resource,"Test2",value,value1,value2) = True Then  
            Wscript.Echo "Value: " + CStr(value)  
            WScript.Echo "Value1: " + value1  
            WScript.Echo "Value2: " + value2  
        End If  

        dim n,l  
        dim updatedProps   
        Dim scfProp  

        n = 0  
        ' Remove the property.  
        For l = 0 To UBound (resource.Props)   

            ' Copy each element except the one to delete.  
            If resource.Props(l).PropertyName <> "Test2" Then  
                Dim embeddedProperty  
                Set embeddedProperty = connection.Get("SMS_EmbeddedProperty").Spawninstance_()  
                If l = 0 Then  
                    ' Create an array to copy to.  
                    updatedProps = array(embeddedProperty)  
                    Redim updatedProps(Ubound(resource.Props)-1)  
                End If  
                ' Copy the element.  
                embeddedProperty.PropertyName = resource.Props(l).PropertyName  
                embeddedProperty.Value = resource.Props(l).value  
                embeddedProperty.Value1 = resource.Props(l).value1  
                embeddedProperty.Value2 = resource.Props(l).value2  

                Set updatedProps(n) = embeddedProperty  
                n = n + 1  
          End If    

        ' Update  
        resource.Props = updatedProps  
        resource.Put_, context  


        ' Check that the property has been deleted.   
        If  GetScfEmbeddedProperty(resource,"Test2",value,value1,value2) = True Then  
            WScript.Echo "Property found"  
            WScript.Echo "Property not found"  
        End If      


    ' Embedded property list.  

        WScript.Echo "Embedded property list"  
        WScript.Echo "----------------------"  

        Dim values  
        values = Array("Tiger","Wolf")  

        Call WriteScfEmbeddedPropertyList(connection,context,resource,"Animals",values)  

        Dim retrievedValues   

        If GetScfEmbeddedPropertyList(resource,"Animals",retrievedValues) = True Then  
            Dim i,c  
            Dim updatedValues  

            c = 0   

            ' Display the list and remove the property Tiger.  
            updatedValues = Array(UBound(retrievedValues)-1)  
            For i = 0 To  UBound (retrievedValues)  
                 Wscript.Echo retrievedValues(i)  
                 If retrievedValues(i) <> "Tiger" Then  

                    updatedValues(c) = retrievedValues(i)  
                    c = c + 1  
                 End If     

            ' Update the property list.  
            Call WriteScfEmbeddedPropertyList(connection,context,resource,"Animals",updatedValues)  

            ' Get the property list and display.  
            Call GetScfEmbeddedPropertyList(resource,"Animals",retrievedValues)  

            For i = 0 To  UBound (retrievedValues)  
                 Wscript.Echo retrievedValues(i)  
            WScript.Echo "Not found"  
        End If   


    ' RegMultiString list.          

        WScript.Echo "Embedded RegMultiString list"  
        WScript.Echo "----------------------------"  

        Dim valueStrings  
        valueStrings= Array("Lisa","Julie")  

        ' Write the RegMultiString list.  
        Call WriteScfRegMultiStringList(connection,context,resource,"Names2",valueStrings)  

        Dim retrievedValueStrings   

        ' Get the RegMultiString list.            
        If GetScfRegMultiStringList(resource,"Names2",retrievedValueStrings) = True Then  

            Dim updatedValueStrings  

            c = 0   
            updatedValueStrings = Array(Ubound(retrievedValueStrings)-1)  
            For i = 0 To UBound (retrievedValueStrings)  
                 Wscript.Echo retrievedValueStrings(i)  
                 if retrievedValueStrings(i) <> "Lisa" Then  
                    updatedValueStrings(c) = retrievedValueStrings(i)  
                 End If  

            Call WriteScfRegMultiStringList(connection,context,resource,"Names",updatedValueStrings)  


            Call GetScfRegMultiStringList(resource,"Names",retrievedValueStrings)  

            For i = 0 To UBound (retrievedValueStrings)  
                 Wscript.Echo retrievedValueStrings(i)  
            WScript.Echo "Not found"              
        End If     

    ' Commit the changes.  
    Set inParams = connection.Get("SMS_SiteControlFile").Methods_("CommitSCF").InParameters.SpawnInstance_  
    inParams.SiteCode = siteCode  
    connection.ExecMethod "SMS_SiteControlFile", "CommitSCF", inParams, , context  

    ' Release the session handle.  
    Set inParams = connection.Get("SMS_SiteControlFile").Methods_("ReleaseSessionHandle").InParameters.SpawnInstance_  
    inParams.SessionHandle = context.Item("SessionHandle")  
    connection.ExecMethod "SMS_SiteControlFile", "ReleaseSessionHandle", inParams    
End Sub  

The example method has the following parameters:

Parameter Type Description
connection - SWbemServices A valid connection to the SMS Provider.
siteCode - String The site code for the Configuration Manager site.

Compiling the Code

This C# example requires:











Robust Programming

For more information about error handling, see About Configuration Manager Errors.

.NET Framework Security

For more information about securing Configuration Manager applications, see Configuration Manager role-based administration.

See Also

Windows Management Instrumentation
About the Configuration Manager Site Control File
How to Read a Configuration Manager Site Control File Embedded Property List