6.2.9 Object Storage Formats
The presentation data in linked or embedded objects can be thought of as a presentation object. A presentation objects can be standard, generic, or NULL. A standard presentation object is used when the format is metafile, bitmap, or device-independent bitmap (DIB). The client library supports the presentation objects, including drawing them. Neither client applications nor object handlers can use the presentation objects; they are solely for the use of the client library.
The following list gives the storage format for strings in OLE. The items appear in the order listed.
| LONG |
Length of string, including terminating null character. |
| Variable |
Null-terminated stream of bytes. |
The following list gives the storage format for the standard presentation object used for linked and embedded objects. The items appear in the order listed.
| LONG |
OLE version number. |
| LONG |
Format identifier. This value is 5. |
| Variable |
Class string. For standard presentation objects, this string is METAFILEPICT, BITMAP, or DIB. |
| LONG |
Width of object, in MM_HIMETRIC units. |
| LONG |
Height of object, in MM_HIMETRIC units. |
| LONG |
Size of presentation data, in bytes. |
| Variable |
Presentation data. |
The following list gives the storage format for the generic presentation object used for linked and embedded objects. Generic objects are used when the clipboard format is other than metafile, bitmap, or DIB. The items appear in the order listed.
| LONG |
OLE version number. |
| LONG |
Format identifier. This value is 5. |
| Variable |
Class string. |
| LONG |
Clipboard format value. If this value exists, the next item in storage is the size of the presentation data. |
| LONG |
Clipboard format name. This value exists only if the clipboard format value is NULL. |
| LONG |
Size of presentation data, in bytes. |
| Variable |
Presentation data. |
The following list gives the storage format for embedded objects. The items appear in the order listed.
| LONG |
OLE version number. |
| LONG |
Format identifier. This value is 2. |
| Variable |
Class string. |
| Variable |
Topic string. |
| Variable |
Item string. |
| LONG |
Size of Native data, in bytes. |
| Variable |
Native data. |
| Variable |
Presentation object (standard, generic, or NULL). |
The following list gives the storage format for linked objects. The items appear in the order listed.
| LONG |
OLE version number. |
| LONG |
Format identifier. This value is 1. |
| Variable |
Class string. |
| Variable |
Topic string. |
| Variable |
Item string. |
| Variable |
Network name string. |
| short |
Network type. |
| short |
Network driver version number. |
| LONG |
Link update options. |
| Variable |
Presentation object (standard, generic, or NULL). |
The following list gives the storage format for static objects. The only difference between the format for static objects and the format for standard presentation objects is the value of the format identifier. The items appear in the order listed.
| LONG |
OLE version number. |
| LONG |
Format identifier. This value is 3. |
| Variable |
Class string. For static objects, this string is METAFILEPICT, BITMAP, or DIB. |
| LONG |
Width of object, in MM_HIMETRIC units. |
| LONG |
Height of object, in MM_HIMETRIC units. |
| LONG |
Size of presentation data, in bytes. |
| Variable |
Presentation data. |