Re: IPropertyBag2 - Can I use it this way?

"Igor Tandetnik" <>
Wed, 13 Feb 2008 16:04:37 -0500
geekgrrl <> wrote:

I ended up imlementing the std::map<CString, VARIANT> for now with my
own interface methods to get/set these values. I believe that I could
keep my internal map, and use that to implememt the Read/Write methods
for IPropertyBag.

I was interested in the IPropertyBag as while I am not currently
loading/saving my property list to a file on disk, I can forsee that
this would be attractive to user, and by using IPropertyBag I could
eventually expand to use IPersistPropertyBag.

Note that IPersistPropertyBag typically works the other way round. The
object implements IPersistPropertyBag; its container implements
IPropertyBag and passes it to IPersistPropertyBag::Save. The object
writes its properties into the container-provided bag. The container
then persists these properties any way it sees fit. Similarly on load:
the container reads the data from whatever persistent storage it uses,
packs the properties into IPropertyBag instance it implements, and
finally passes the bag to the control's implementation of
IPersistPropertyBag::Load. The object extracts properties from the bag
and stores them in its internal data structures.

In other words, the control implementing IPropertyBag is not a
prerequisite, nor is it in any way helpful, for implementing

Currently the client has
to call SetProperty( name, value) for each property they want to set.
I can see them wanting to suck this up from a file on disk.

Clearly then, it's the client that would have to implement IPropertyBag,
not the object.
With best wishes,
    Igor Tandetnik

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