OLE Property Set Specification

All data elements within a property set are stored in Intel representation (that is, in little-endian byte order).

OLE defines a standard, serialized data format for property sets, which gives them the following characteristics:

  • Property sets allow for different applications to create their own independent property sets to serve the application's needs.

  • Property sets can be stored in a single IStream instance or in an IStorage instance containing multiple streams. Indeed, in the abstract, property sets are simply another data type that can be stored in many different forms of an in-memory or on-disk storage. For recommended conventions on creating the string name for the storage object, see the section "Naming Property Sets" later in this appendix.

  • Property sets can be transmitted using the IDataObject interface and/or the Clipboard. Because property sets are self-identifying, they are ideal for transferring data between applications.

  • Property sets allow for a dictionary of displayable names to be included to further describe the contents. A set of conventions for choosing property names are recommended. For more information on this optional dictionary, see "Property ID Zero" later in this appendix.

The figure below shows the overall structure of a property set:

The property set stream is divided into three major parts:

  • Header

  • FORMATID/offset pair

  • Section containing the actual property set values

The overall length of the property set stream is 256Kb. The following sections of this chapter describe the individual components that make up the property set data format as shown in the previous figure.

Note Previous versions of this document described extensions to the property set stream with more than one section allowed, but that has been revised now to provide for one section in the property stream.

Software for developers
Delphi Components
.Net Components
Software for Android Developers
More information resources
Unix Manual Pages
Delphi Examples
Databases for Amazon shops developers
Amazon Categories Database
Browse Nodes Database