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IContextMenuCB::CallBack method (shobjidl_core.h)

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Enables the callback function for a context menu.

Syntax

HRESULT CallBack(
  [in]           IShellFolder *psf,
  [in, optional] HWND         hwndOwner,
  [in]           IDataObject  *pdtobj,
  [in]           UINT         uMsg,
  [in]           WPARAM       wParam,
  [in]           LPARAM       lParam
);

Parameters

[in] psf

Type: IShellFolder*

A pointer to the IShellFolder interface of the object that supports the IContextMenuCB::CallBack interface. The context menu interface is returned on a call to GetUIObjectOf.

[in, optional] hwndOwner

Type: HWND

A handle to the owner of the context menu. This value can be NULL.

[in] pdtobj

Type: IDataObject*

A pointer to an IDataObject that contains information about a menu selection. Implement interface IDataObject, or call SHCreateDataObject for the default implementation.

[in] uMsg

Type: UINT

A notification from the Shell's default menu implementation. For example, the default menu implementation calls DFM_MERGECONTEXTMENU to allow the implementer of IContextMenuCB::CallBack to remove, add, or disable context menu items in this callback. Use one of the following notifications.

DFM_MERGECONTEXTMENU
DFM_INVOKECOMMAND
DFM_GETHELPTEXT
DFM_GETHELPTEXTW
DFM_WM_MEASUREITEM
DFM_WM_DRAWITEM
DFM_WM_INITMENUPOPUP
DFM_VALIDATECMD
DFM_INVOKECOMMANDEX
DFM_MAPCOMMANDNAME
DFM_GETDEFSTATICID
DFM_GETVERB
DFM_MERGECONTEXTMENU_BOTTOM

[in] wParam

Type: WPARAM

Data specific to the notification specified in uMsg. See the individual notification page for specific requirements.

[in] lParam

Type: LPARAM

Data specific to the notification specified in uMsg. See the individual notification page for specific requirements.

Return value

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header shobjidl_core.h (include Shobjidl.h)

See also

Creating Context Menu Handlers

IContextMenuCB