BUG: IOleCache::Cache Returns Incorrect Error Value

An OLE 2.0 container application calls IOleCache::Cache for a particular FORMATETC and is returned the value OLE_S_FORMATETC_NOTSUPPORTED. A subsequent call to IOleCache::Cache with the same FORMATETC returns CACHE_S_SAMECACHE.

The OLE 2.0 server application has a message filter installed and is rejecting all incoming calls. The default object handler cannot get the information from the server to fill the cache, but the cache is still created. A more appropriate return value would be OLE_S_SOMECACHES_NOTUPDATED.

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.