Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!helios!bcm!rice!uw-beaver!uw-june!chou
From: chou@cs.washington.edu (Pai Chou)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Serial Driver Routines in Think C
Message-ID: <15294@june.cs.washington.edu>
Date: 2 Mar 91 03:53:54 GMT
References: <10686@bunny.GTE.COM>
Reply-To: chou@june.cs.washington.edu (Pai Chou)
Organization: University of Washington, Computer Science, Seattle
Lines: 25

In article <10686@bunny.GTE.COM> rc05@gte.com (Ramesh Chandak) writes:
>I'm looking for the serial driver routine that will allow sending characters
>over the modem port. I realize that the Inside Macintosh Volume II has
>a list of commands, but I haven't come across that helps you shipping 
>characters over the serial line. 
>
>I believe the function SerGetBuf allows you to receive characters. Again
>with this function how do you determine that the character you have received
>is "a" or "b" ?

SerGetBuf() lets you find how HOW MANY BYTES there are left to be read,
but it DOES NOT read the characters.

  You should call it like
	err = SerGetBuf(-6, &count)
  where count is a longint.

Once you find out count > 0, then you call FSRead() to read the chars.

You should use FSRead(-6, count, &buf) and FSWrite(-7, count, &buf) 
to read/write the modem port.  FSRead(-8,..) and FSWrite(-9,..) for
the printer port.

Pai Chou
chou@june.cs.washington.edu