TRasterImage.SaveStreamNeeded procedure

Declaration

procedure SaveStreamNeeded

Description

SaveStreamNeeded is a procedure used to ensure that the internal save stream for the shared image is allocated.

Raises an EInvalidGraphicOperation exception if BeginUpdate (without a matching EndUpdate) is active in the class instance.

No actions a performed in the method when a TMemoryStream has already been assigned as the save stream for the internal TSharedRasterImage instance.

SaveStreamNeeded is called from methods like SaveToStream and WriteData, and occurs before operations which read or write to the save stream.