IDirectWriterLock::WaitForWriteAccess method (objidl.h)

The WaitForWriteAccess method obtains exclusive write access to a storage object.


HRESULT WaitForWriteAccess(
  DWORD dwTimeout



Specifies the time in milliseconds that this method blocks while waiting to obtain exclusive write access to the storage object. If dwTimeout is zero, the method does not block waiting for exclusive access for writing. The INFINITE time-out defined in the Platform SDK is allowed for dwTimeout.

Return value

This method can return one of these values.

Return code Description
S_OK The caller has successfully obtained exclusive write access to the storage.
S_FALSE This method was called again without an intervening call to IDirectWriterLock::ReleaseWriteAccess.
STG_E_INUSE The specified time-out expired without obtaining exclusive write access.


When a storage is opened in direct mode (STGM_DIRECT) with the STGM_READWRITE|STGM_SHARE_DENY_WRITE, you can call this method to obtain exclusive write access to the storage.

This method returns immediately if no readers have the storage open. If the storage is still open for reading, this method blocks for the specified dwTimeout or until the current readers close the storage.


Minimum supported client Windows 2000 Professional [desktop apps | UWP apps]
Minimum supported server Windows 2000 Server [desktop apps | UWP apps]
Target Platform Windows
Header objidl.h
Library Uuid.lib
DLL Ole32.dll

See also