Adding RSoP Support to a Group Policy Snap-in Extension

This topic describes how to add support for Resultant Set of Policy (RSoP) to your Group Policy snap-in extension with the fewest number of changes to existing code.

The recommended way to support RSoP in an existing MMC snap-in is to add a property to the CComponentData and CComponent classes that are already implemented. The property must indicate whether the snap-in is running in RSoP mode or in editing mode. You should register two class IDs for the snap-in, one for RSoP mode and one for editing mode. (Mapping two class IDs to the same snap-in allows you to reuse user interface components such as dialog boxes and helper functions.) When you call the DllGetClassObject function, pass a flag that indicates the operation mode of the snap-in, as shown in the code sample following. For more information about MMC, see the Microsoft Management Console.

For more information, see the following topics:

• Using the IRSOPInformation Interface
• Querying for Group Policy WMI Objects

The following code example shows how to add support for Resultant Set of Policy (RSoP) to your Group Policy snap-in extension.

    //
    // Administrative Templates in editing mode
    //

    if (IsEqualCLSID (rclsid, CLSID_PolicySnapInUser)) {
    //
    // Second argument is the RSoP flag (FALSE). 
    //
        CPolicyComponentDataCF *pComponentDataCF = new CPolicyComponentDataCF(TRUE, FALSE);   // ref == 1

        if (!pComponentDataCF)
            return E_OUTOFMEMORY;

        hr = pComponentDataCF->QueryInterface(riid, ppv);

        pComponentDataCF->Release();     // release initial reference

        return hr;
    }

    //
    // Administrative Templates in RSoP mode
    //

    if (IsEqualCLSID (rclsid, CLSID_RSOPolicySnapInUser)) {
    //
    // Second argument is the RSoP flag (TRUE). 
    //
        CPolicyComponentDataCF *pComponentDataCF = new CPolicyComponentDataCF(TRUE, TRUE);   // ref == 1

        if (!pComponentDataCF)
            return E_OUTOFMEMORY;

        hr = pComponentDataCF->QueryInterface(riid, ppv);

        pComponentDataCF->Release();     // Release the initial reference

        return hr;
    }