Re: REQUEST FOR INFO: DISABLING ^C

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#457

From: Scott C. Sadow
Date: Thu, 23 Jul 1992 13:13

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In article <1992Jul20.124824.2971@ibmpcug.co.uk>, fredc@ibmpcug.co.uk (Fred Curtis) writes:
>I want to disable the ^C interrupt.  I can trap it and ignore it
>by reseting the DOS interrupt vector, but it still prints "^C" on
>the screen.

The best way I have found of doing this is to create a small interrupt
handler that just sets a flag. Then set interrupt vector 1BH to this
routine. (1BH is the BIOS ctrl-break handler) I also set interrupt vector
23H to this same routine, or slightly different. (23H is the DOS
ctrl-c/ctrl-break handler)

Oh yes - make sure you save both vectors before changing them and restore
them before your programs ends.

(By the way, I have done this also for interrupt vector 5, which is print
screen. Then I can check the global variable and, if set, print the
graphics screen.)

   Scott C. Sadow
   scott@mycro.UUCP
   ...gatech!nanovx!mycro!scott

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Message-ID: <1992Jul23.091344@mycro.UUCP>

Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!emory!wa4mei!nanovx!mycro!scott

References: <1992Jul20.124824.2971@ibmpcug.co.uk>

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Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!emory!wa4mei!nanovx!mycro!scott
From: scott@mycro.UUCP (Scott C. Sadow)
Newsgroups: comp.os.msdos.programmer,connect.audit
Subject: Re: REQUEST FOR INFO: DISABLING ^C
Summary: How do you disable the ^C handling?
Message-ID: <1992Jul23.091344@mycro.UUCP>
Date: 23 Jul 92 13:13:44 GMT
References: <1992Jul20.124824.2971@ibmpcug.co.uk>
Lines: 23

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