IStreamPersist is the interface for responding to requests to load/save an object from/to a persistent stream.
IStreamPersist = interface;
IStreamPersist introduces two methods, SaveToStream, and LoadFromStreamthat allows the designer to respond a request to store or retrieve the implementing object to a persistent stream.
You use SaveToStream to serialise an object, and save this data in a stream independent of the running application. This serialised version of the object literally persists and is available for loading back using LoadFromStream. It is then de-serialised, and reconstituted as an object.
For example, the TGraphic class itself implements the IStreamPersist.
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