IMoniker::GetTimeOfLastChange - OLE Programmer's Reference

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IMoniker::GetTimeOfLastChange

Returns a number representing the time the object identified by this moniker was last changed. To be precise, the time returned is the earliest one OLE can identify after which no change has occurred, so this time may be later than the actual 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] 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.

pmkToLeft

[in] 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.

pFileTime

[out] Points to the FILETIME structure receiving the time of last change. A value of {0xFFFFFFFF,0x7FFFFFFF} indicates an error (for example, exceeded time limit, information not available).

Return Values
S_OK

Indicates the method returned a time successfully.

MK_E_EXCEEDEDDEADLINE

Indicates that the binding operation could not be completed within the time limit specified by the bind context's BIND_OPTS structure.

MK_E_CONNECTMANUALLY

Indicates that 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.

E_UNEXPECTED

Indicates an unexpected error.

Comments
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. Container applications call IOleObject::IsUpToDate to determine if a linked object (or an embedded object containing linked objects) is up-to-date without actually binding to the object. This enables an application to quickly determine which linked objects require updating when the end user opens a document. The application can then bind only those linked objects that need updating (after prompting the end user to determine whether they should be updated), instead of binding every linked object in the document.

Notes to Implementors
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 attempt 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.

See Also
IBindCtx::GetRunningObjectTable, IRunningObjectTable::GetTimeOfLastChange

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