Function ShowGameInviteUIWithContextForUser 

pub unsafe extern "system" fn ShowGameInviteUIWithContextForUser(
    user: *mut c_void,
    serviceconfigurationid: HSTRING,
    sessiontemplatename: HSTRING,
    sessionid: HSTRING,
    invitationdisplaytext: HSTRING,
    customactivationcontext: HSTRING,
    completionroutine: GameUICompletionRoutine,
    context: *const c_void,
) -> HRESULT