STGM Constants

If you take a look at the help file, you'll see that there are quite a few STGM constants. I'll only discuss the ones used in this article and one or two of general interest.

STGM_WRITE Write only access

STGM_READ Read only access

STGM_READWRITE Read & Write Access

STGM_SHARE_DENY_NONE Don't deny subsequent access

STGM_SHARE_DENY_READ Deny subsequent read access

STGM_SHARE_DENY_WRITE Deny subsequent write access

STGM_SHARE_EXCLUSIVE No other app may open the file subsequently

STGM_CREATE If there is an existing stream / storage it is removed. If there is not an existing stream / storage a new one is created

STGM_FAILIFTHERE If a storage or stream already exists with the specified name, then fail

STGM_DIRECT All changes to the DocFile occur immediately

STGM_TRANSACTED Changes are not written until Commit is called. Similar to commit and rollback in a database. (Not discussed further in this article)

STGM_DELETEONRELEASE Storage or stream created with this flag is automatically deleted when its parent storage is released. Very useful for temporary files!

STGM_WRITE	Write only access
STGM_READ	Read only access
STGM_READWRITE	Read & Write Access

STGM_SHARE_DENY_NONE	Don't deny subsequent access
STGM_SHARE_DENY_READ	Deny subsequent read access
STGM_SHARE_DENY_WRITE	Deny subsequent write access
STGM_SHARE_EXCLUSIVE	No other app may open the file subsequently

STGM_CREATE	If there is an existing stream / storage it is removed. If there is not an existing stream / storage a new one is created
STGM_FAILIFTHERE	If a storage or stream already exists with the specified name, then fail

STGM_DIRECT	All changes to the DocFile occur immediately
STGM_TRANSACTED	Changes are not written until Commit is called. Similar to commit and rollback in a database. (Not discussed further in this article)

STGM_DELETEONRELEASE	Storage or stream created with this flag is automatically deleted when its parent storage is released. Very useful for temporary files!