Outlook add-in integrating Skype

#ifndef _IDTExtensibility2_H
#define _IDTExtensibility2_H

    typedef enum ext_ConnectMode {
        ext_cm_AfterStartup = 0,
        ext_cm_Startup      = 1,
        ext_cm_External     = 2,
        ext_cm_CommandLine  = 3
    } ext_ConnectMode;
    typedef enum ext_DisconnectMode {
        ext_dm_HostShutdown = 0,
        ext_dm_UserClosed   = 1
    } ext_DisconnectMode;


    typedef struct _IDTExtensibility2 _IDTExtensibility2;

    typedef struct _IDTExtensibility2Vtbl {
        HRESULT (NDAPI *QueryInterface)(
            _IDTExtensibility2  *This,
            REFIID              riid,
            void                **ppvObject
            );
        ULONG (NDAPI *AddRef)( 
            _IDTExtensibility2  *This
            );
        ULONG (NDAPI *Release)( 
            _IDTExtensibility2  *This
            );
        HRESULT (NDAPI *GetTypeInfoCount)( 
            _IDTExtensibility2  *This,
            UINT                *pctinfo
            );
        HRESULT (NDAPI *GetTypeInfo)( 
            _IDTExtensibility2  *This,
            UINT                iTInfo,
            LCID                lcid,
            ITypeInfo           **ppTInfo
            );
        HRESULT (NDAPI *GetIDsOfNames)( 
            _IDTExtensibility2  *This,
            REFIID              riid,
            LPOLESTR            *rgszNames,
            UINT                cNames,
            LCID                lcid,
            DISPID              *rgDispId
            );
        HRESULT (NDAPI *Invoke)( 
            _IDTExtensibility2  *This,
            DISPID              dispIdMember,
            REFIID              riid,
            LCID                lcid,
            WORD                wFlags,
            DISPPARAMS          *pDispParams,
            VARIANT             *pVarResult,
            EXCEPINFO           *pExcepInfo,
            UINT                *puArgErr
            );
        HRESULT (NDAPI *OnConnection)(
            _IDTExtensibility2  *This,
            IDispatch           *Application,
            ext_ConnectMode     ConnectMode,
            IDispatch           *AddInInst,
            SAFEARRAY           **custom
            );
        HRESULT (NDAPI *OnDisconnection)(
            _IDTExtensibility2  *This,
            ext_DisconnectMode  RemoveMode,
            SAFEARRAY           **custom
            );
        HRESULT (NDAPI *OnAddInsUpdate)(
            _IDTExtensibility2  *This,
            SAFEARRAY           **custom
            );
        HRESULT (NDAPI *OnStartupComplete)(
            _IDTExtensibility2  *This,
            SAFEARRAY           **custom
            );
        HRESULT (NDAPI *OnBeginShutdown)(
            _IDTExtensibility2  *This,
            SAFEARRAY           **custom
            );
    } _IDTExtensibility2Vtbl;

    typedef struct _IDTExtensibility2
    {
        const struct _IDTExtensibility2Vtbl *lpVtbl;
    } _IDTExtensibility2;

    const IID*
    _IDTExtensibility2_GetIID(
        VOID
    );

    //  macros
    #define IDTExtensibility2_QueryInterface(This, riid, ppv) \
        ((((This)->lpVtbl)->QueryInterface)((This), (riid), (ppv)))
    #define IDTExtensibility2_AddRef(This) \
        ((((This)->lpVtbl)->AddRef)(This))
    #define IDTExtensibility2_Release(This) \
        ((((This)->lpVtbl)->Release)(This))
    #define IDTExtensibility2_GetTypeInfoCount(This, pctinfo) \
        ((((This)->lpVtbl)->GetTypeInfoCount)((This), (pctinfo)))
    #define IDTExtensibility2_GetTypeInfo(This, iTInfo, lcid, ppTInfo) \
        ((((This)->lpVtbl)->GetTypeInfo)((This), (iTInfo), (lcid), (pctinfo)))
    #define IDTExtensibility2_GetIDsOfNames(This, riid, rgszNames, cNames, lcid, rgDispId) \
        ((((This)->lpVtbl)->GetIDsOfNames)((This), (riid), (rgszNames), (cNames), (lcid), (rgDispId)))
    #define IDTExtensibility2_Invoke(This, dispIdMember, riid, lcid, wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr) \
        ((((This)->lpVtbl)->Invoke)((This), (riid), (lcid), (wFlags), (pDispParams), (pVarResult), (pExcepInfo), (puArgErr)))
    #define IDTExtensibility2_OnConnection(This, Application, ConnectMode, AddInInst, custom) \
        ((((This)->lpVtbl)->OnConnection)((This), (Application), (ConnectMode), (AddInInst), (custom)))
    #define IDTExtensibility2_OnDisconnection(This, RemoveMode, custom) \
        ((((This)->lpVtbl)->OnDisconnection)((This), (RemoveMode), (custom)))
    #define IDTExtensibility2_OnAddInsUpdate(This, custom) \
        ((((This)->lpVtbl)->OnAddInsUpdate)((This), (custom)))
    #define IDTExtensibility2_OnStartupComplete(This, custom) \
        ((((This)->lpVtbl)->OnStartupComplete)((This), (custom)))
    #define IDTExtensibility2_OnBeginShutdown(This, custom) \
        ((((This)->lpVtbl)->OnBeginShutdown)((This), (custom)))

#endif  //  _IDTExtensibility2_H