Format Identifiers
Property set values are stored in a section that is tagged with a unique
format identifier. For example, the FMTID for the OLE Document Summary Information
property set is:
F29F85E0-4FF9-1068-AB91-08002B27B3D9
To define a FMTID for the Document Summary Information property set, you would
use the
DEFINE_GUID macro in an include file for the code that manipulates the property set:
DEFINE_GUID(FormatID_SummaryInformation, 0xF29F85E0, 0x4FF9, 0x1068, 0xAB,
0x91, 0x08, 0x00, 0x2B, 0x27, 0xB3, 0xD9);
Anywhere in your code you need to use the FMTID for the Document Summary
Information property set, you can access it through the FormatID_SummaryInformation
variable.
When storing property sets in
IStorage instances, you need to convert the FMTID to a string name for the storage
object. For more information on recommended conventions for creating the string
name, see the section "Naming Property Sets" later in this appendix.
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