Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.3 alpha 4/15/85; site elsie.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!houxm!mtuxo!mtunh!mtung!mtunf!ariel!vax135!cornell!uw-beaver!tektronix!hplabs!pesnta!qumix!ittvax!decvax!genrad!panda!talcott!harvard!seismo!elsie!ken From: ken@elsie.UUCP (Ken Brown) Newsgroups: net.micro.pc Subject: how do you detect redirection Message-ID: <5156@elsie.UUCP> Date: Tue, 9-Jul-85 11:26:46 EDT Article-I.D.: elsie.5156 Posted: Tue Jul 9 11:26:46 1985 Date-Received: Sat, 13-Jul-85 14:59:26 EDT Organization: Data Resources, Inc. Lines: 24 The new Microsoft C compiler includes the isatty() function in the standard library. Unfortunately, it seems to work differently than the UNIX function by the same name. Apparently, under DOS isatty() can only detect the difference between a device (any device) and a file. Therefore, isatty() returns true if a file handle is attached to the console or to a printer, unlike the UNIX isatty() which returns false it the handle is attached to a printer. My question is, does anyone know how to detect whether or not the standard output has been redirected to a printer port (lpt1, etc.)? I've looked at all of the information in the FILE structure. I can't find anything useful there. I also looked at the DOS function 44h (IOCTL), but apparently it does not distinguish different devices in any way either. Any clues would be appreciated. Thanks in advance, Ken Brown Data Resources, Inc. ...!decvax!allegra!umcp-cs!elsie!ken