IOleItemContainer
The
IOleItemContainer interface is used by item monikers when they are bound to the objects they
identify.
When any container of objects uses item monikers to identify its objects, it
must define a naming scheme for those objects. The container's
IOleItemContainer implementation uses knowledge of that naming scheme to retrieve an object
given a particular name. Item monikers use the container's
IOleItemContainer implementation during binding.
When to Implement
You must implement
IOleItemContainer if you're a moniker provider handing out item monikers. Being a moniker
provider means handing out monikers that identify your objects to make them
accessible to moniker clients. You must use item monikers if the objects you're
identifying are contained within another object and can be individually identified
using a string.
The most common example of moniker providers are OLE applications that support
linking. If your OLE application supports linking to objects smaller than a
file-based documents, you need to use item monikers. For a server application
that allows linking to a portion of a document (such as selections within a
document), you use the item monikers to identify those objects. For a container
application that allows linking to embedded objects, you use the item monikers to
identify the embedded objects.
You must define a naming scheme for identifying the objects within the
container; for example, embedded objects in a document could be identified with names
of the form "embedobj1," "embedobj2," and so forth, while ranges of cells in a
spreadsheet could be identified with names of the form "A1:E7," "G5:M9," and so
forth. (Ranges of cells in a spreadsheet are examples of as "pseudo-objects"
because they do not have their own persistent storage, they simply represent a
portion of the container's internal state.) You create an item moniker that
represents an object's name using the
CreateItemMoniker API function and hand it out to a moniker client. When an item moniker is
bound, your implementation of
IOleItemContainer must be able to take a name and retrieve the corresponding object.
When to Use
Applications typically do not call
IOleItemContainer methods directly. The item moniker implementation of
IMoniker is the primary caller of
IOleItemContainer methods.
Methods in VTable Order
IUnknown Methods
| Description
|
QueryInterface
| Returns pointers to supported interfaces.
|
AddRef
| Increments the reference count.
|
Release
| Decrements the reference count.
|
IOleContainer Methods
| Description
|
EnumObjects
| Enumerates objects in a container.
|
LockContainer
| Keeps container running until explicitly released.
|
IOleItemContainer Methods
| Description
|
GetObject
| Returns a pointer to a specified object.
|
GetObjectStorage
| Returns a pointer to an object's storage.
|
IsRunning
| Checks whether an object is running.
|
See Also
CreateItemMoniker,
IMoniker 
Item Moniker Implementation
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