Class MPictureFactory

class MPictureFactory;

Description

Abstract interface for instantiating and restoring new CPicture derived objects.

A concrete derived class creates pictures of one or more specific types. The class has no member data and just one function, NewPictureL, that needs to be provided by derived classes.

Members

Defined in MPictureFactory:
NewPictureL()

virtual void NewPictureL(TPictureHeader &aHeader, const CStreamStore &aDeferredPictureStore) const=0;

Description

Interface to the picture restoration process that ensures that a picture of the correct type is restored.

The class of the object to be restored is determined by the UID of the stored picture, contained in the specified picture header.

The function can allow the restoration of:

just one CPicture-derived class, returning an error if the UID indicates that the stored picture is not of the required type

many different CPicture-derived classes, using the UID to choose which of the possible CPicture-derived classes should be instantiated

Parameters

TPictureHeader &aHeader The picture header that should be restored. const CStreamStore &aDeferredPictureStore The store in which both the header and picture reside.