You can use properties with property identifiers to:
Using property identifiers with property sets has different results than using properties with property identifier sets, though the ways in which you use them are the same.
Whenever you assign the values of a TPropertyIDSet to a TPropertySet (using the assign operator or a constructor), the property set that results does not contain valid values. The same is true when you add a TPropertyID instance to a TPropertySet--that member does not contain a valid value. However, the property container constructed by adding a TPropertyID to a TPropertySet is valid, and you can later fill it with a valid value with an MPropertyStore read function.
Using properties with a property identifier set
You can construct a property identifier set using a TPropertySet instance. This constructs a TPropertyIDSet instance using the contents of the property set instance.
When you use the = operator to assign a property set to a property identifier set, this assigns the identifiers contained in the property set to the TPropertyIDSet instance.
You can use TPropertyIDSet::Add to add a property to a property identifier set. As with the assign operator, this action adds the identifier contained within the property to the property identifier set.
Using property identifiers with a property set
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