Subj : last_read and scan_ptr values
To   : Nightfox
From : Digital Man
Date : Sun Mar 29 2015 11:47 pm

  Re: last_read and scan_ptr values
  By: Nightfox to Digital Man on Sat Mar 28 2015 09:17 am

 >   Re: last_read and scan_ptr values
 >   By: Nightfox to Digital Man on Fri Mar 27 2015 22:49:47
 >
 >  Ni> If a new message is posted in a sub-board and that's the only message
 >  Ni> in  the sub-board, it seems that scan_ptr and last_read would point to
 >  Ni> that  message (is that correct?). If the currently logged-in user reads
 >  Ni> that  message, then scan_ptr and last_read would remain unchanged since
 >  Ni> that's  the only message in the sub-board. During a newscan, how can a
 >  Ni> JavaScript  script determine whether the user has read that message
 >  Ni> (even if it wasn't  written to the user - so the MSG_READ attribute
 >  Ni> 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)

                                            digital man

Synchronet "Real Fact" #28:
Rob Swindell first called BBSes (at 300bps) with an Apple II computer in 1982.
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