Subj : last_read and scan_ptr values
To   : Nightfox
From : Digital Man
Date : Sun Mar 29 2015 11:45 pm

  Re: last_read and scan_ptr values
  By: Nightfox to Digital Man on Fri Mar 27 2015 10:49 pm

 >   Re: last_read and scan_ptr values
 >   By: Digital Man to Nightfox on Thu Mar 26 2015 21:55:01
 >
 > If a new message is posted in a sub-board and that's the only message in the
 > sub-board, it seems that scan_ptr and last_read would point to that message
 > (is that correct?).

Posting a message does not modify either the user's scan_ptr or last_read 
values. Only reading messages modifies those values.

 > If the currently logged-in user reads that message,
 > then scan_ptr and last_read would remain unchanged since that's the only
 > message in the sub-board.

No, if the user has never read messages on a sub-board, then their scan_ptr and 
last_read values would be 0 (no message).

 > During a newscan, how can a JavaScript script
 > determine whether the user has read that message (even if it wasn't written
 > to the user - so the MSG_READ attribute wouldn't be set)?

The MSG_READ attribute should be set anytime a user reads a message addressed 
to them and the attribute is not already set. You don't need to check any 
pointers for that. You can see how Synchronet checks/sets the MSG_READ 
attribute by searching for MSG_READ in: 
http://cvs.synchro.net/cgi-bin/viewcvs.cgi/src/sbbs3/readmsgs.cpp

                                            digital man

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