structure is a generalized Clipboard format. It is enhanced to encompass a
target device, the aspect or view of the data, and a storage medium indicator.
Where one might expect to find a Clipboard format, OLE uses a FORMATETC
data structure instead.
Defined in the IEnumFORMATETC
typedef struct tagFORMATETC
Indicates the particular clipboard format of interest. There are three types
of formats recognized by OLE:
- Standard interchange formats, such as CF_TEXT.
- Private application formats understood only by the application offering the
format, or by other applications offering similar features.
- OLE formats, which are used to create linked or embedded objects.
Points to a DVTARGETDEVICE
structure containing information about the target device for which the data
is being composed. A NULL value is used whenever the specified data format is
independent of the target device or when the caller doesn't care what device is
used. In the latter case, if the data requires a target device, the object
should pick an appropriate default device (often the display for visual components).
Data obtained from an object with a NULL target device, such as most
metafiles, is independent of the target device. The resulting data is usually the same
as it would be if the user chose the Save As command from the File menu and
selected an interchange format.
Specifies one of the DVASPECT
enumeration constants that indicate how much detail should be contained in
the rendering. A single clipboard format can support multiple aspects or views of
the object. Most data and presentation transfer and caching methods pass
aspect information. For example, a caller might request an object's iconic picture,
using the metafile clipboard format to retrieve it. Note that only one DVASPECT
value can be used in dwAspect
. That is, dwAspect
cannot be the result of a BOOLEAN OR operation on several DVASPECT
Identifies part of the aspect when the data must be split across page
boundaries. The most common value is -1, which identifies all of the data. For the
aspects DVASPECT_THUMBNAIL and DVASPECT_ICON, lindex
Specifies one of the TYMED
enumeration constants which indicate the type of storage medium used to
transfer the object's data. Data can be transferred using whatever medium makes
sense for the object. For example, data can be passed using global memory, a disk
file, or structured storage objects. For more information, see the TYMED
structure is used by methods in the data transfer and presentation interfaces
as a parameter specifying the data being transferred. For example, the IDataObject::GetData
method uses the FORMATETC
structure to indicate exactly what kind of data the caller is requesting.
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