IStorage::OpenStorage

Article
11/18/2015

A version of this page is also available for

4/8/2010

This method opens an existing storage object with the specified name according to the specified access mode.

Syntax

HRESULT OpenStorage( 
  const WCHAR* pwcsName, 
  IStorage* pstgPriority, 
  DWORD grfMode, 
  SNB snbExclude, 
  DWORD reserved, 
  IStorage** ppstg 
);

Parameters

pwcsName
[in] Pointer to a wide character string that contains the name of the storage object to open. It is ignored if the pstgPriority parameter is non-NULL.

pstgPriority
[in] If the pstgPriority parameter is not NULL, it is an IStorage interface 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 the grfMode parameter.

When the IStorage::OpenStorage method returns, pstgPriority is no longer valid. Use the value supplied in the ppstg parameter.

If the pstgPriority parameter is NULL, it is ignored.

grfMode
[in] Access mode to use when opening the storage object. See the STGM enumeration values for descriptions of the possible values.

Whatever other modes you choose, you must at least specify STGM_SHARE_EXCLUSIVE when calling this method.

snbExclude
[in] Set to NULL. A non-NULL value will return STG_E_INVALIDPARAMETER.

reserved
[in] Reserved for future use; set to zero.

ppstg
[out] When the operation is successful, pointer to the location of an IStorage pointer to the opened storage object.

This parameter is set to NULL if an error occurs.

Return Value

The following table shows the return values for this method.

Value	Description
S_OK	The storage object was opened successfully.
E_PENDING	Asynchronous Storage only: Part or all of the storage's data is currently unavailable. For more information see the IFillLockBytes interface and Asynchronous Storage.
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 storage 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 that contains a single stream called CONTENTS. In direct mode, the new storage is immediately written to disk. In transacted mode, the new storage is written to a temporary storage in memory and later written to disk when it is committed.

Remarks

Storageobjects 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.

To determine whether the platform supports this interface, see Determining Supported COM APIs.

Requirements

Header	objidl.h, objidl.idl
Library	ole32.lib, uuid.lib
Windows Embedded CE	Windows CE 2.0 and later
Windows Mobile	Windows Mobile Version 5.0 and later

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