# StgOpenAsyncDocfileOnIFillLockBytes

Opens an existing root asynchronous storage object on a byte array wrapper object provided by the caller.

WINOLEAPI StgOpenAsyncDocFileOnIFillLockBytes(

IFillLockBytes *pflb | // Pointer to byte array wrapper object
DWORD grfmode | // Storage access mode
DWORD asyncFlags | // Asynchronous storage flags
IStorage **ppstgOpen | // Indirect pointer to asynchronous storage
); |

Parameters

pflb
  [in] IFillLockBytes pointer to the byte array wrapper object that contains the storage object to be opened.
grfmode
  [in] Specifies the access mode to use to open the storage object. The most common access mode, taken from the STGM enumeration, is STGM_READ.
asyncFlags
  [in] Indicates whether a connection point on a storage will be inherited by its substorages and streams. ASYNC_MODE_COMPATIBILITY indicates that the connection point is inherited; ASYNC_MODE_DEFAULT indicates that the connection point is not inherited.
ppstgOpen
  [out] Pointer to IStorage pointer on root asynchronous storage object.

Return Values

This function supports the standard return values E_OUTOFMEMORY, E_UNEXPECTED, E_INVALIDARG, and E_FAIL, as well as the following:

E_PENDING
  Data is currently unavailable.
E_NOINTERFACE
  A pointers was not returned to the requested interface.
STG_E_INSUFFICIENTMEMORY
  There is insufficient memory to complete this operation.

Remarks

The root storage of the asynchronous storage object is opened according to the access mode in the grfMode parameter. A pointer to the IStorage interface on the opened storage object is supplied through the ppstgOpen parameter.

The byte array wrapper object must have been previously instantiated through a call to the StgGetIFillLockBytesOnFile function.

StgOpenAsyncDocFileOnIFillLockBytes does not support priority access mode or exclusions. Otherwise, it works in much the same way as the StgOpenStorageOnILockBytes function.

The returned storage object has a connection point for IProgressNotify.

See Also

IFillLockBytes, ILockBytes, StgGetIFillLockBytesOnFile, StgOpenStorageOnILockBytes.