Subj : last_read and scan_ptr values
To   : Digital Man
From : Nightfox
Date : Mon Mar 30 2015 10:10 am

 >  >  Ni> If a new message is posted in a sub-board and that's the only
 >  >  Ni> message in  the sub-board, it seems that scan_ptr and last_read
 >  >  Ni> would point to that  message (is that correct?). If the 
currently
 >  >  Ni> logged-in user reads that  message, then scan_ptr and last_read
 >  >  Ni> would remain unchanged since that's  the only message in the
 >  >  Ni> sub-board. During a newscan, how can a JavaScript  script 
determine
 >  >  Ni> whether the user has read that message (even if it wasn't  
written
 >  >  Ni> to the user - so the MSG_READ attribute wouldn't be set)?
 >  >
 >  > I've done a little bit more testing this morning, and now I'm 
wondering
 >  > if 0 is a meaningful value for scan_ptr?  If I post a new message in 
an
 >  > empty sub-board, it seems that the scan_ptr value for that sub-board 
is
 >  > 0 until I read the message I posted.
 > 
 > Correct. Posting a message does not change any message pointers and the
 > initial pointer value will be 0 (no message).
 > 
 >  > A related question is, will a message number
 >  > (the 'number' property in a message header) ever be 0?
 > 
 > No. 0 is a special value indicating "no message". You can read about SMB
 > message numbers here: http://synchro.net/docs/smb.html#Index File 
(*.SID)

Thanks - This confirms what I was wondering.

I understand that posting won't modify those pointers; maybe my question could
have been worded better in regards to that - I was referring to doing a
newscan after a new message had been posted by another user (and on my BBS, I
was testing a situation where a sub-board only has one message in it).

Nightfox

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