----boundary-LibPST-iamunique-1257083000_-_-
Content-type: text/plain
Hi Andrew,
What are you trying to achieve? 'Sharing' a file just means that you
don't care if anybody else changes it while you are working on it.
Whoever saves it last will be the one whose changes are preserved. Any
changes made by the other user (process) will be lost.
If you edit a shared file outside of BlackBox using NotePad, your
BlackBox program will not be aware of the changes unless you first save
them in NotePad and then reopen the file in BlackBox.
Chris Burrows
CFB Software
http://www.cfbsoftware.com
-----Original Message-----
From: blackbox{([at]})nowhere.xy
Thomas
Sent: Thursday, 12 January 2006 6:46 PM
To: BlackBox Mailing List
Subject: [BlackBox] - closing shared files
Hei BlackBox community,
I am very confused about the need to close files that have
been opened in shared mode. Suppose I open a file in shared mode using f
:= Files.dir.Old(. Files.shared) and read the file and find some sort
of error in its contents that requires the file to be edited. So long as
the file f is not stored in a global variable I think there should be no
problem, I should be able to start say NotePad to edit the file. Do I
have to explicitly close the file f by calling f.Close? In the
documentation for module File it says
PROCEDURE (f: File) Close
NEW, ABSTRACT
Closes an open file. Close does nothing if the file is not open or if it
has been opened in "shared" mode. If a call to New or Old is not
balanced by a call to Close, the Close is later performed automatically,
at an unspecified time. If it is known that a file won't be used again,
it is recommended to call its Close procedure.
The file f and the riders operating on file f are not valid anymore
after closing f, i.e., no more file or rider operations may be performed
on it. However, the closed file can be retrieved and opened again by
procedure Old.
Close may call Flush internally.
Close should (but need not necessarily) be called explicitly after a
file is not needed anymore.
However looking at module HostFiles I am not sure that Close does
"nothing" for files opened in shared mode.
I suspect that statements like
IF Files.dir.Old(..files.shared) # NIL THEN . END
are causing problems. Maybe FINALIZE does not get called in this case?
Moi
Andrew
--- BlackBox
--- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy
----boundary-LibPST-iamunique-1257083000_-_-
Content-type: application/rtf
Content-transfer-encoding: base64
Content-Disposition: attachment; filename="rtf-body.rtf"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----boundary-LibPST-iamunique-1257083000_-_---
Received on Tue Jan 17 2006 - 01:24:12 UTC