IMoniker::GetTimeOfLastChange
Provides a
number representing the time the object identified by this moniker was last
changed. To be precise, the time returned is the earliest time OLE can identify
after which no change has occurred, so this time may be later than the time of
the last change to the object.
HRESULT GetTimeOfLastChange(
IBindCtx *pbc, |
//Bind context to be used |
IMoniker *pmkToLeft, |
//Moniker to the left in the composite |
FILETIME *pFileTime |
//Receives the time of last change |
); |
|
Parameters
pbc
[in] Pointer
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
pmkToLeft
[in] If the
moniker is part of a composite moniker, pointer to the moniker to the left of
this moniker. This parameter is primarily used by moniker Implementers to
enable cooperation between the various components of a composite moniker.
Moniker clients should pass NULL.
pFileTime
[out] Pointer
to the FILETIME
Return Values
The method
supports the standard return value E_UNEXPECTED, as well as the following:
S_OK
The method
successfully returned a time.
MK_E_EXCEEDEDDEADLINE
The binding
operation could not be completed within the time limit specified by the bind
context s BIND_OPTS
MK_E_CONNECTMANUALLY
The operation
was unable to connect to the storage for this object, possibly because a network
device could not be connected to. For more information, see IMoniker::BindToObject
MK_E_UNAVAILABLE
The time of
the change is unavailable, and will not be available no matter what deadline is
used.
Remarks
Notes to Callers
If you re
caching information returned by the object identified by the moniker, you may
want to ensure that your information is up-to-date. To do so, you would call IMoniker::GetTimeOfLastChange
and compare the time returned with the time you last retrieved information from
the object.
For the
monikers stored within linked objects, IMoniker::GetTimeOfLastChange is
primarily called by the default handler s implementation of IOleObject::IsUpToDate
Notes to Implementers
It is
important to perform this operation quickly because, for linked objects, this
method is called when a user first opens a compound document. Consequently,
your IMoniker::GetTimeOfLastChange implementation should not bind to any
objects. In addition, your implementation should check the deadline parameter
in the bind context and return MK_E_EXCEEDEDDEADLINE if the operation cannot be
completed by the specified time.
There are a
number of strategies you can use in your implementations:
For many types of monikers, the
pmkToLeft parameter identifies the container of the object identified by
this moniker. If this is true of your moniker class, you can simply call IMoniker::GetTimeOfLastChange
on the pmkToLeft parameter, since an object cannot have changed at a
date later than its container.
You can get a pointer to the
Running Object Table (ROT) by calling IBindCtx::GetRunningObjectTable on the pbc
parameter, and then calling IRunningObjectTable::GetTimeOfLastChange , since the ROT generally
records the time of last change.
You can get the storage
associated with this moniker (or the pmkToLeft moniker) and return the
storage s last modification time with a call to IStorage::Stat.
See Also