IOleUndoUnit::GetUnitType
Returns the
CLSID and a type identifier for the undo unit.
HRESULT GetUnitType(
|
CLSID* pClsid , |
//Pointer to
CLSID for undo unit |
|
LONG* plID |
//Pointer to
type identifier for undo unit |
|
); |
|
Parameters
pclsid
[out] Pointer
to CLSID for the undo unit.
plID
[out] Pointer
to the type identifier for the undo unit.
Return Values
S_OK
Both the
CLSID and type identifier were successfully returned.
Remarks
A parent undo
unit can call this method on its child units to determine whether it can apply
special handling to them. The CLSID returned can be the CLSID of the undo unit
itself, of its creating object, or an arbitrary GUID. The undo unit has the
option of returning CLSID_NULL, in which case the caller can make no
assumptions about the type of this unit. The only requirement is that the CLSID
and type identifier together uniquely identify this type of undo unit.
Note that the
undo manager and parent undo units do not have the option of accepting or
rejecting child units based on their type.