Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ncar!cruff
From: cruff@ncar.ucar.edu (Craig Ruff)
Newsgroups: comp.sys.mac.programmer
Subject: Bug in SysBeep?
Message-ID: <664@ncar.ucar.edu>
Date: 4 Sep 88 18:09:15 GMT
Reply-To: cruff@ncar.UCAR.EDU (Craig Ruff)
Organization: Scientific Computing Division/NCAR, Boulder CO
Lines: 32

I think I have found a bug in SysBeep.  Setup:

	Mac+
	System 4.2
	Volume = 0 (off)

After a call to SysBeep, thePort->txFont field is set back to 0!

The following code illustrates this:

	EraseRect(&thePort->portRect);
	MoveTo(30, 40);
	TextFont(4);
	TextSize(9);
	DrawText("Before", 0, 6);
	SysBeep(3);
	MoveTo(30, 60);
	DrawText("After", 0, 5);

The "Before" string is drawn in Monaco font.  The "After" string is drawn
in System font (Chicago).  Tracking down the bug with a debugger,
thePort->txFont is changed sometime during the trap to SysBeep.

Note that this bug does not occur if the volume > 0;
-- 
Craig Ruff      NCAR                         INTERNET: cruff@ncar.UCAR.EDU
(303) 497-1211  P.O. Box 3000                   CSNET: cruff@ncar.CSNET
		Boulder, CO  80307               UUCP: cruff@ncar.UUCP
-- 
Craig Ruff      NCAR                         INTERNET: cruff@ncar.UCAR.EDU
(303) 497-1211  P.O. Box 3000                   CSNET: cruff@ncar.CSNET
		Boulder, CO  80307               UUCP: cruff@ncar.UUCP