IStorage::CreateStorage

Creates and opens a new storage object nested within this storage object.

HRESULT CreateStorage(

const wchar_t * pwcsName,	//Points to the name of the new storage object
DWORD grfMode,	//Access mode for the new storage object
DWORD reserved1,	//Reserved; must be zero
DWORD reserved2,	//Reserved; must be zero
IStorage ** ppstg	//Points to new storage object
);

Parameters
pwcsName

[in]Points to the name of the newly created storage object. This name can be used later to open or reopen the storage object.

grfMode

[in]Specifies the access mode to use when opening the newly created storage object. See the STGM enumeration values for descriptions of the possible values.

reserved1

[in]Reserved for future use; must be zero.

reserved2

[in]Reserved for future use; must be zero.

ppstg

[out]Points to the location where the new 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 created successfully.

STG_E_ACCESSDENIED

Insufficient permissions to create storage object.

STG_E_FILEALREADYEXISTS

The name specified for the storage object already exists in the storage object and the grfmode flag includes the flag STGM_FAILIFTHERE.

STG_E_INSUFFICIENTMEMORY

The storage object was not created 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
If an element with the name specified in the pwcsName parameter already exists and the grfMode parameter includes the STGM_CREATE flag, the existing element is replaced by the new storage object. If the grfMode parameter includes the STGM_CONVERT flag, the existing element is converted to a stream object named CONTENTS and the new storage object is created containing the CONTENTS stream object. The destruction of the old element and the creation of the new storage object are both subject to the transaction mode on the parent storage object.

If the storage object already exists and grfMode is set to STGM_FAILIFTHERE, this method fails with the return value STG_E-FILEALREADYEXISTS.

Note to Callers
The OLE-provided compound file implementation of the IStorage::CreateStorage method does not support the STGM_DELETEONRELEASE flag. Other implementations of IStorage might support this flag.