ugzannin@sunybcs.UUCP (Adrian Zannin) (10/15/86)
O.K....here goes. I recently started working for a place that uses an IBM
PC for inventory posting. The basic story is that the guy they had there
running the machine before was literally self-taught and made a bloody mess
of the system. Anyway, I was originally hired as a parts counter man, but
since I am going to school for computers I kind of "aquired" the job of
maintaining the system. The only thing is is that they don't give me much
to work with. The other guy wrote his inventory posting program in DBASE III+
and when he left he took that with him, so basically the only thing I have
to work with is BASIC. (By the way, I just installed DOS 3.0...I found it
buried under a bunch of stuff, so I have no idea if they have any later
versions).
Now, being a "newcomer" to IBM PC's (I'm used to VAXes...:-) ) I need some
help. In BASIC or BASICA, how can you effectively trap the ctrl-BREAK
sequence so that it won't terminate the program? I have managed to tackle
the problem only half way...I do this at the beginning of the program:
100 key 16, chr$(&h04) + chr$(&h46) 'define the ctrl-BREAK sequence
110 key(16) on 'set the trap
120 on key(16) gosub 10000 'tell where to go on key
Now, this traps the ctrl-BREAK sequence *ONLY IF* the Numlock or the
Capslock key is *NOT* set. If either one or both of them is set, it doesn't
trap it and the program terminates. Does anyone out there have a solution
to this problem? Also, is is possible to set a trap in DOS so that a
batch file cannot be interupted with a ctrl-C or ctrl-BREAK? I need
solutions to this because some of these programs involve passwords, and if
you can terminate the program you may as well forget the passwords...
I would apreciate any help that I can get because these people are
rather anxious to get some real work done...(I wish they would get a C
compiler!). Please respond via e-mail because I just started
reading this group and I have 200+ articles to read. Thanks in advance!
Oh yeah...I almost forgot...in the above question, if I hit either shift
key and ctrl-break, the trap doesn't work either...
--
Adrian Zannin -- SUNY at Buffalo Computer Science
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