Outlook add-in integrating Skype

#ifndef OutlookUtils_H
#define OutlookUtils_H

    typedef enum enOutlookVersion {
        OUTLOOK_MAJOR_VERSION_UNKNOWN  = -1,
        OUTLOOK_MAJOR_VERSION_2000     =  9,
        OUTLOOK_MAJOR_VERSION_2002     = 10,
        OUTLOOK_MAJOR_VERSION_2003     = 11,
        OUTLOOK_MAJOR_VERSION_2007     = 12,
        OUTLOOK_MAJOR_VERSION_2010     = 14
    } enOutlookVersion;

    typedef struct OutlookMgr OutlookMgr;

    typedef struct OutlookMgrVtbl {
        VOID (NDAPI *Cleanup)(
            OutlookMgr          *This
            );
        BOOL (NDAPI *ReadMajorVersion)(
            OutlookMgr          *This,
            IDispatch           *Application
            );
        BOOL (NDAPI *ReadAddinFastShutdownBehavior)(
            OutlookMgr          *This, 
            IDispatch           *Application
            );
        BOOL (NDAPI *GetMajorVersion)(
            OutlookMgr          *This, 
            LONG                *MajorVersion
            );
        BOOL (NDAPI *GetAddinFastShutdown)(
            OutlookMgr          *This, 
            BOOL                *AddinFastShutdown
            );
        BOOL (NDAPI *GetProp_IDispatch)(
            OutlookMgr          *This, 
            IDispatch           *Object, 
            LPCWSTR             PropName, 
            IDispatch           **Property
            );
        HRESULT (NDAPI *Unadvise)(
            OutlookMgr          *This, 
            IDispatch           *Object, 
            const IID           *EventDIID, 
            DWORD               *CookieID
            );
        HRESULT (NDAPI *FindEnumMemberByName)(
            OutlookMgr          *This, 
            LPCWSTR             EnumName, 
            LPCWSTR             MemberName, 
            int                 *Value
            );
    } OutlookMgrVtbl;

    typedef struct OLEnumMember OLEnumMember;
    typedef struct OLEnumMember {
        LPWSTR  Name;
        int     Value;
        BOOL    valid;

        OLEnumMember* Next;
    } OLEnumMember;

    typedef struct OLEnumDesc OLEnumDesc;
    typedef struct OLEnumDesc {
        LPWSTR          Name;
        OLEnumMember    *Members;

        OLEnumDesc      *Next;
    } OLEnumDesc;

    struct OutlookMgr {
        const struct OutlookMgrVtbl    *lpVtbl;

        LONG        MajorVersion;
        BOOL        AddinFastShutdown;

        OLEnumDesc  *OutlookEnums;
    };

    OutlookMgr*
    OutlookMgr_GetObject(
        VOID
        );

    //  C macros to avoid lpVtbl
    #define OutlookMgr_Cleanup(This) \
        (((This)->lpVtbl)->Cleanup(This))
    #define OutlookMgr_ReadMajorVersion(This, Application) \
        (((This)->lpVtbl)->ReadMajorVersion((This), (Application)))
    #define OutlookMgr_ReadAddinFastShutdownBehavior(This, Application) \
        (((This)->lpVtbl)->ReadAddinFastShutdownBehavior((This), (Application)))
    #define OutlookMgr_GetMajorVersion(This, MajorVersion) \
        (((This)->lpVtbl)->GetMajorVersion((This), (MajorVersion)))
    #define OutlookMgr_GetAddinFastShutdown(This, AddinFastShutdown) \
        (((This)->lpVtbl)->GetAddinFastShutdown((This), (AddinFastShutdown)))
    #define OutlookMgr_GetProp_IDispatch(This, Object, PropName, Property) \
        (((This)->lpVtbl)->GetProp_IDispatch((This), (Object), (PropName), (Property)))
    #define OutlookMgr_Unadvise(This, Object, EventDIID, CookieID) \
        (((This)->lpVtbl)->Unadvise((This), (Object), (EventDIID), (CookieID)))
    #define OutlookMgr_FindEnumMemberByName(This, EnumName, MemberName, Value) \
        (((This)->lpVtbl)->FindEnumMemberByName((This), (EnumName), (MemberName), (Value)))

    #define Outlook_Cleanup() \
        OutlookMgr_Cleanup(OutlookMgr_GetObject())
    #define Outlook_ReadMajorVersion(Application) \
        OutlookMgr_ReadMajorVersion(OutlookMgr_GetObject(), (Application))
    #define Outlook_ReadAddinFastShutdownBehavior(Application) \
        OutlookMgr_ReadAddinFastShutdownBehavior(OutlookMgr_GetObject(), (Application))
    #define Outlook_GetMajorVersion(MajorVersion) \
        OutlookMgr_GetMajorVersion(OutlookMgr_GetObject(), (MajorVersion))
    #define Outlook_GetAddinFastShutdown(AddinFastShutdown) \
        OutlookMgr_GetAddinFastShutdown(OutlookMgr_GetObject(), (AddinFastShutdown))
    #define Outlook_GetProp_IDispatch(Object, PropName, Property) \
        OutlookMgr_GetProp_IDispatch(OutlookMgr_GetObject(), (Object), (PropName), (Property))
    #define Outlook_Unadvise(Object, EventDIID, CookieID) \
        OutlookMgr_Unadvise(OutlookMgr_GetObject(), (Object), (EventDIID), (CookieID))
    #define Outlook_FindEnumMemberByName(EnumName, MemberName, Value) \
        OutlookMgr_FindEnumMemberByName(OutlookMgr_GetObject(), (EnumName), (MemberName), (Value))

#endif  //  OutlookUtils_H