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IConsoleNameSpace2::AddExtension method (mmc.h)

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The IConsoleNameSpace2::AddExtension method enables the snap-in to add an extension snap-in that dynamically extends the namespace of a selected item.

Syntax

HRESULT AddExtension(
  [in] HSCOPEITEM hItem,
  [in] LPCLSID    lpClsid
);

Parameters

[in] hItem

A handle to the item to extend with the snap-in specified by lpClsid.

[in] lpClsid

A pointer to the CLSID of the snap-in that will extend the namespace of the item specified by hItem.

Return value

This method can return one of these values.

Remarks

When a snap-in calls the AddExtension method, the namespace extension specified by lpClsid extends only the specific instance of the item specified by hItem. Other items of that type are not affected: Calling AddExtension is not the same as using the snap-in manager to add an extension to a snap-in. By using the snap-in manager to add an extension to a snap-in, the extension is added to all instances of snap-ins of that type.

In addition, the AddExtension method only works for items that are directly owned by the snap-in making the AddExtension call. For example, if a snap-in has a namespace extension that adds an item to its namespace, the snap-in cannot call AddExtension for the item provided by the namespace extension because the snap-in does not own that item.

A common place to add dynamic namespace extensions is in the MMCN_EXPAND notification handler of the snap-in's IComponentData object.

Note  The extension snap-in must be a namespace extension. In addition, the MMC registry entries for the snap-in to be extended, as well as the extension snap-in, must be set correctly.
 
To dynamically add other types of extensions (such as context menus, toolbars, property sheets, or taskpads), the snap-in must add the new clipboard format CCF_MMC_DYNAMIC_EXTENSIONS to the data object for the items you want to extend. The CCF_MMC_DYNAMIC_EXTENSIONS format uses the SMMCDynamicExtensions structure. For more information, see Dynamic Non-Namespace Extensions.

If an extension snap-in is intended to be used as a dynamic extension only, that extension snap-in should not be listed in the Available Extensions list box when the primary snap-in is selected in the Snap-in that can be extended box on the snap-in manager's extensions page. To hide an extension in the snap-in manager, add the key "Dynamic Extensions" to the key that represents the node type of the item you want to extend. Then put the CLSIDs of the snap-ins that should only dynamically extend the node type as values under the new key.

Examples

The following code example adds the extension snap-in specified by CLSID_Extension:

IConsoleNameSpace2* pExtensions = NULL;
HRESULT hr = m_pConsole->QueryInterface(IID_IConsoleNameSpace2, reinterpret_cast<void**>(&pExtensions));
 
if (SUCCEEDED(hr))
{
    hr = pExtensions->AddExtension(m_pStaticRoot, const_cast<CLSID*>(&CLSID_Extension));
    ASSERT(hr == S_OK);
    pExtensions->Release();
}

Requirements

Requirement Value
Minimum supported client Windows Vista
Minimum supported server Windows Server 2008
Target Platform Windows
Header mmc.h
DLL Mmcndmgr.dll

See also

IConsoleNameSpace2