Discards the caches in memory.
| DWORD dwDiscardOptions
||//Save data or discard it
Indicates whether data is to be saved prior to the discard. Valid values are
from the enumeration DISCARDCACHE
. Containers that have drawn a large object and need to free up memory may
want to specify DISCARDCACHE_SAVEIFDIRTY so that the newest presentation is saved
for the next time the object must be drawn.
Containers that have activated an embedded object, made some changes, and then
OLECLOSE_NOSAVE) to roll back the changes can specify DISCARDCACHE_NOSAVE to
ensure that the native and presentation data are not out of synchronization.
The cache(s) were discarded according to the value specified in dwDiscardOptions
One or more arguments are invalid.
An unexpected error occurred.
There is no storage available for saving the data in the cache.
The storage medium is full.
method is commonly used to handle low memory conditions by freeing memory
currently being used by presentation caches.
Once discarded, the cache will satisfy subsequent IDataObject::GetData
calls by reverting to disk-based data.
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