Streaming Nonpublished Component Data
Chapter 11 indicates that the Delphi IDE automatically knows how to stream the published properties of a component to and from a DFM file. What happens, however, when you have nonpublished data that you want to be persistent by keeping it in the DFM file? Fortunately, Delphi components provide a mechanism for writing and reading programmer-defined data to and from the DFM file.
Defining Properties
The first step in defining persistent nonpublished “properties is to override a component's DefineProperties() method. This method is inherited from TPersistent, and it's defined as follows:
procedure DefineProperties(Filer: TFiler); virtual;
By default, this method handles reading and writing published properties ...
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