Activates the connection to the link source by binding the moniker stored
within the linked object.
| DWORD bindflags,
||//Flag in case CLSID of link source is different
| IBindCtx *pbc
||//Bind context to be used
[in] Specifies how to proceed if the link source has a different CLSID from
the last time it was bound. If this parameter is zero and the CLSIDs are
different, the method fails and returns OLE_E_CLASSDIFF. If the
OLELINKBIND_EVENIFCLASSDIFF value from the OLELINKBIND
enumeration is specified and the CLSIDs are different, the method binds
successfully and updates the CLSID stored in the linked object.
[in] Points to the bind context to be used in this binding operation. This
parameter can be NULL. 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 binding implementation should retrieve
information about its environment. For more information, see IBindCtx
Indicates that the link source is bound.
Indicates that the link source was not bound because its CLSID has changed.
This error is returned only if the OLELINKBIND_EVENIFCLASSDIFF flag is not
specified in the bindflags
Indicates that the link source could not be found or (if the link source's
moniker is a composite) some intermediate object identified in the composite could
not be found.
Indicates that the link's moniker is NULL.
Binding the moniker might require calling this function; therefore, this
method may return errors generated by this function.
Notes to Callers
Typically, your container application does not need to call the IOleLink::BindToSource
method directly. When it's necessary to activate the connection to the link
source, your container typically calls IOleObject::DoVerb
, or IOleLink::Update
. The linked object's implementation of these methods calls IOleLink::BindToSource
. Your container can also call the OleRun
API function, which
when called on a linked object
In each of the examples listed above, in which IOleLink::BindToSource
is called indirectly, the bindflags
parameter is set to zero. Consequently, these calls can fail with the
OLE_E_CLASSDIFF error if the class of the link source is different from what it was
the last time the linked object was bound. This could happen, for example, if the
original link source was an embedded Lotus spreadsheet that an end user had
subsequently converted (using the Change Type dialog box) to an Excel spreadsheet.
If you want your container to bind even though the link source now has a
different CLSID, you can call IOleLink::BindToSource
directly and specify OLELINKBIND_EVENIFCLASSDIFF for the bindflags
parameter. This call binds to the link source and updates the link object's
CLSID. Alternatively, your container can delete the existing link and use the OleCreateLink
API function to create a new linked object.
Notes on Provided Implementation
The linked object caches the interface pointer to the link source acquired
The linked object's IOleLink::BindToSource
implementation first tries to bind using a moniker consisting of the compound
document's moniker composed with the link source's relative moniker. If
successful, it updates the link's absolute moniker. Otherwise, it tries to bind using
the absolute moniker, updating the relative moniker if successful.
binds to the link source, it calls the compound document's IOleContainer::LockContainer
implementation to keep the containing compound document alive while the link
source is running. IOleLink::BindToSource
also calls the IOleObject::Advise
implementations of the link source to set up advisory connections. The IOleLink::UnbindSource
implementation unlocks the container and deletes the advisory connections.
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