The TYMED enumeration is used in the STGMEDIUM structure.
At a Glance
| Header file: | Objidl.h |
| Windows CE versions: | 2.0 and later |
Syntax
typedef enum tagTYMED {
TYMED_HGLOBAL = 1,
TYMED_FILE = 2,
TYMED_ISTREAM = 4,
TYMED_ISTORAGE = 8,
TYMED_NULL = 0,
} TYMED;
Elements
TYMED_HGLOBAL
The storage medium is a global memory handle (HGLOBAL). Allocate the global handle with the GMEM_SHARE flag. If the STGMEDIUM punkForRelease member is NULL, the destination process should use GlobalFree to release the memory.
TYMED_FILE
The storage medium is a disk file identified by a path. If the STGMEDIUM punkForRelease member is NULL, the destination process should use OpenFile to delete the file.
TYMED_ISTREAM
The storage medium is a stream object identified by an IStream pointer. Use ISequentialStream::Read to read the data. If the STGMEDIUM punkForRelease member is NULL, the destination process should use IStream::Release to release the stream component.
TYMED_ISTORAGE
The storage medium is a storage component identified by an IStorage pointer. The data is in the streams and storages contained by this IStorage instance. If the STGMEDIUM punkForRelease member is NULL, the destination process should use IStorage::Release to release the storage component.
TYMED_GDI
The storage medium is a GDI component (HBITMAP). If the STGMEDIUM punkForRelease member is NULL, the destination process should use DeleteObject to delete the bitmap.
TYMED_MFPICT
The storage medium is a metafile (HMETAFILE). Use the Windows or Win32 functions to access the metafile's data. If the STGMEDIUM punkForRelease member is NULL, the destination process should use DeleteMetaFile to delete the bitmap.
TYMED_ENHMF
The storage medium is an enhanced metafile. If the STGMEDIUM punkForRelease member is NULL, the destination process should use DeleteEnhMetaFile to delete the bitmap.
TYMED_NULL
No data is being passed.
Remarks
Windows CE does not support the values TYMED_GDI, TYMED_MFPICT, or TYMED_ENHMF.
During data transfer operations, a storage medium is specified. This medium must be released after the data transfer operation. The provider of the medium indicates its choice of ownership scenarios in the value it provides in the STGMEDIUM structure. A NULL value for the IUNKNOWN field indicates that the receiving body of code owns and can free the medium. A non-NULL pointer specifies that ReleaseStgMedium can always be called to free the medium.
See Also