Returns a reduced moniker; that is, another moniker that refers to the same
object as this moniker but can be bound with equal or greater efficiency.
| IBindCtx *pbc,
||//Bind context to be used
| DWORD dwReduceHowFar,
||//How much reduction should be done
| IMoniker **ppmkToLeft,
||//Moniker to the left in the composite
| IMoniker **ppmkReduced
||//Receives the reduced moniker
[in] Points to the bind context to be used in this binding operation. The bind
context caches objects bound during the binding process, contains parameters
that apply to all operations using the bind context, and provides the means by
which the moniker implementation should retrieve information about its
environment. For more information, see IBindCtx
[in] Specifies how far this moniker should be reduced. This parameter must be
one of the values from the MKRREDUCE
enumeration. For more information on the MKRREDUCE
enumeration, see the "Data Structures" section.
[in, out] On entry, *ppmkToLeft
points to the moniker to the left of this moniker, if this moniker is part of
a composite. This parameter is primarily used by moniker implementors to
enable cooperation between the various components of a composite moniker; moniker
clients can usually pass NULL.
On exit, *ppmkToLeft
is usually set to NULL, indicating no change in the original moniker to the
left. In rare situations *ppmkToLeft
is set to non-NULL, indicating that the previous moniker to the left should
be disregarded and the moniker returned through *ppmkToLeft
is the replacement. In such a situation, the implementation must call IUnknown::Release
on the passed-in pointer and call IUnknown::AddRef
on the returned moniker; the caller must release it later. If an error
occurs, the implementation can either leave the parameter unchanged or set it to
[out] Receives a pointer to the reduced form of this moniker, which can be
NULL if an error occurs or if this moniker is reduced to nothing. If this moniker
cannot be reduced, *ppmkReduced
is simply set to this moniker and the return value is MK_S_REDUCED_TO_SELF.
is non-NULL, the implementation must call IUnknown::AddRef
on the parameter; it is the caller's responsibility to call IUnknown::Release
. (This is true even if *ppmkReduced
is set to this moniker.)
Indicates that this moniker was reduced.
Indicates that this moniker could not be reduced any further, in which case, *ppmkReduced
is this moniker.
Indicates that the operation could not be completed within the time limit
specified by the bind context's BIND_OPTS
Indicates an unexpected error.
Indicates insufficient memory.
method is intended for the following uses:
- It enables the construction of user-defined macros or aliases as new kinds of
moniker classes. When reduced, the moniker to which the macro evaluates is
- It enables the construction of a kind of moniker that tracks data as it moves
about. When reduced, the moniker of the data in its current location is
- On file systems that support an ID-based method of accessing files which is
independent of file names; a file moniker could be reduced to a moniker which
contains one of these IDs.
The intent of the MKRREDUCE
flags passed in the dwReduceHowFar
parameter is to provide the ability to programmatically reduce a moniker to a
form whose display name is recognizable to the user. For example, paths in the
file system, bookmarks in word-processing documents, and range names in
spreadsheets are all recognizable to users. In contrast, a macro or an alias
encapsulated in a moniker are not recognizable to users.
Notes to Callers
The scenarios described above are not currently implemented by the
system-supplied moniker classes.
You should call IMoniker::Reduce
before comparing two monikers using the IMoniker::IsEqual
method, because a reduced moniker is in its most specific form. IMoniker::IsEqual
may return S_FALSE on two monikers before they are reduced and return S_OK
after they are reduced.
Notes to Implementors
If the current moniker can be reduced, your implementation must not reduce the
moniker in-place. Instead, it must return a new moniker that represents the
reduced state of the current one. This way, the caller still has the option of
using the non-reduced moniker (for example, enumerating its components). Your
implementation should reduce the moniker at least
as far as is requested.
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