IPersistMemory Interface

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The IPersistMemory interface saves and loads objects from a stream.

IPersistMemory Methods

GetSizeMax	Returns the size, in bytes, of the stream needed to save the object.
InitNew	Initializes the object to a default state.
IsDirty	Checks the object for changes since it was last saved.
Load	Instructs the object to load its persistent data from memory.
Save	Instructs the object to save its persistent data to memory.

Interface Information

Implementation	Custom
Inherits from	IPersist
Header and IDL files	Ocidl.h; Ocidl.idl
Minimum availability	Internet Explorer 4.0
Minimum operating systems	Windows 95, Windows NT 4.0

Remarks

IPersistMemory operates exactly as IPersistStreamInit, except that it allows the caller to provide a fixed-size memory block (identified with a void *) as opposed to IPersistStreamInit, which involves an arbitrarily expandable IStream.

The cbSize argument to Load and Save indicates the amount of memory accessible through the pvMem pointer.

The IsDirty, GetSizeMax, and InitNew members are semantically and syntactically identical to those in IPersistStreamInit.