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IStorage::OpenStorage
Opens an existing storage object with the specified name according to the
specified access mode.
HRESULT OpenStorage(
const wchar_t * pwcsName,
| //Points to the name of the storage object to open
| IStorage * pstgPriority,
| //Points to previous opening of the storage object
| DWORD grfMode,
| //Access mode for the new storage object
| SNB snbExclude,
| //Points to a block of stream names in the storage object
| DWORD reserved,
| //Reserved; must be zero
| IStorage ** ppstg
| //Points to opened storage object
| );
|
|
Parameters
pwcsName
[in]Points to the name of the storage object to open. It is ignored if pstgPriority is non-NULL.
pstgPriority
[in]If the pstgPriority parameter is not NULL, it is a pointer to a previous opening of an element of
the storage object, usually one that was opened in priority mode. The storage
object should be closed and re-opened according to grfMode. When the IStorage::OpenStorage method returns, pstgPriority is no longer valid. Use the value returned in the ppstg parameter. If the pstgPriority parameter is NULL, it is ignored.
grfMode
[in]Specifies the access mode to use when opening the storage object. See the STGM enumeration values for descriptions of the possible values.
snbExclude
[in]Either NULL or a non-NULL value that points to a block of stream names in
this storage object that are to be emptied as the object is opened. This
exclusion happens independent of whether a snapshot copy happens on the open.
reserved
[in]Reserved for future use; must be zero.
ppstg
[out]Points to the location where the IStorage interface pointer is returned; only valid if the operation is successful.
This parameter is set to NULL if an error occurs.
Return Values
S_OK
The storage object was opened successfully.
STG_E_ACCESSDENIED
Insufficient permissions to open storage object.
STG_E_FILENOTFOUND
The storage object with the specified name does not exist.
STG_E_INSUFFICIENTMEMORY
The storage object was not opened due to a lack of memory.
STG_E_INVALIDFLAG
The value specified for the grfMode flag is not a valid STGM enumeration value.
STG_E_INVALIDFUNCTION
The specified combination of grfMode flags is not supported.
STG_E_INVALIDNAME
Invalid value for pwcsName.
STG_E_INVALIDPOINTER
The pointer specified for the storage object was invalid.
STG_E_INVALIDPARAMETER
One of the parameters was invalid.
STG_E_REVERTED
The object has been invalidated by a revert operation above it in the
transaction tree.
STG_E_TOOMANYOPENFILES
The storage object was not created because there are too many open files.
STG_S_CONVERTED
The existing stream with the specified name was replaced with a new storage
object containing a single stream called CONTENTS. The new storage object will be
added.
Comments
Root storage objects can be opened with STGM_DELETEONRELEASE, in which case the object is
destroyed when it receives its final release. This is useful for creating
temporary storage objects.
Note to Callers
The OLE-provided compound file implementation of the IStorage::OpenStorage method does not support the following behaviors:
- The STGM_PRIORITY flag is not supported for non-root storages.
- Opening the same storage object more than once from the same parent storage is
not supported. The STGM_SHARE_EXCLUSIVE flag must be specified.
Other implementations of IStorage might support these features.
See Also
IStorage::CreateStorage
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