Returns a moniker that, when composed onto the end of this moniker (or one
with a similar structure), yields the specified moniker.
| IMoniker *pmkOther,
||//Moniker to which a relative path should be taken
| IMoniker **ppmkRelPath
||//Receives the relative moniker
[in] Points to the moniker to which a relative path should be taken.
[out] Receives a pointer to the relative moniker. If an error occurs, the
implementation sets *ppmkRelPath
to NULL. If *ppmkRelPath
is non-NULL, the implementation must call IUnknown::AddRef
on the parameter; it is the caller's responsibility to call IUnknown::Release
A meaningful relative path has been returned.
Indicates that there is no common prefix shared by the two monikers and that
the moniker returned in *ppmkRelPath
Indicates that this moniker is a relative moniker, such as an item moniker.
This moniker must be composed with the moniker of its container before a relative
path can be determined.
Indicates insufficient memory.
Indicates an unexpected error.
A relative moniker is analogous to a relative path (such as "..\backup"). For
example, suppose you have one moniker that represents the path
"c:\projects\secret\art\pict1.bmp" and another moniker that represents the path
"c:\projects\secret\docs\chap1.txt." Calling IMoniker::RelativePathTo
on the first moniker, passing the second one as the pmkOther
parameter, would create a relative moniker representing the path
Notes to Callers
Moniker clients typically do not need to call IMoniker::RelativePathTo
. This method is primarily called by the default handler for linked objects.
Linked objects contain both an absolute and a relative moniker to identify the
link source (this enables link tracking if the user moves a directory tree
containing both the container and source files). The default handler calls this
method to create a relative moniker from the container document to the link source
(that is, it calls IMoniker::RelativePathTo
on the moniker identifying the container document, passing the moniker
identifying the link source as the pmkOther
If you do call IMoniker::RelativePathTo
, call it only on absolute monikers; for example, a file moniker or a
composite moniker whose leftmost-component is a file moniker, where the file moniker
represents an absolute path. Do not call this method on relative monikers.
Notes to Implementors
Your implementation of IMoniker::RelativePathTo
should first determine whether pmkOther
is a moniker of a class that you recognize and for which you can provide
special handling (for example, if it is of the same class as this moniker). If so,
your implementation should determine the relative path. Otherwise, it should
pass both monikers in a call to the MonikerRelativePathTo
API function, which correctly handles the generic case.
The first step in determining a relative path is determining the common prefix
of this moniker and pmkOther
. The next step is to break this moniker and pmkOther
into two parts each, say (P, myTail) and (P, otherTail) respectively, where P
is the common prefix. The correct relative path is then the inverse of myTail
composed with otherTail:
Comp( Inv( myTail ), otherTail )
Where Comp() represents the composition operation and Inv() represents the
Note that for certain types of monikers, you cannot use your IMoniker::Inverse
method to construct the inverse of myTail. For example, a file moniker
returns an anti-moniker as an inverse, while its IMoniker::RelativePathTo
method must use one or more file monikers that each represent the path ".."
to construct the inverse of myTail.
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