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From: cjdb@sphinx.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Reopening stdout
Message-ID: <1131@sphinx.UChicago.UUCP>
Date: Thu, 12-Feb-87 10:12:52 EST
Article-I.D.: sphinx.1131
Posted: Thu Feb 12 10:12:52 1987
Date-Received: Fri, 13-Feb-87 20:38:40 EST
Organization: University of Chicago Library Computer Systems
Lines: 19



Ray Duncan, on p. 262 of Advanced MS-DOS, relates how command.com
opens and closes the standard output handles. Does anyone know exactly
how? (I can see how stdout can be closed with a DOS call, using the
preassigned handle, but it is not so clear how it would be opened,
since opening doesn't use handles.)

Also, when I want to simulate > NUL from within an application (right
before using EXEC to load another program, to prevent that program
from writing its introductory greetings to the screen), I use int 21h
function 44h (IOCTL) and set BX to 1 (stdout) and bit 2 to 1 (= NUL
device).  This seems to work fine, but can anyone suggest a different
or better way?

Thanks.
-- 
Charles Blair   			    ..!ihnp4!gargoyle!sphinx!cjdb
The University of Chicago		          PMRCJDB@UCHIMVS1.Bitnet