Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!samsung!dali.cs.montana.edu!milton!uw-beaver!ubc-cs!ubc-bdcvax!alistair
From: alistair@ubc-bdcvax.UUCP (Alistair Blachford)
Newsgroups: comp.sys.tandy
Subject: Model 100 programming help
Keywords: Model 100, BASIC, help
Message-ID: <742@ubc-bdcvax.UUCP>
Date: 24 Jul 90 22:37:08 GMT
Organization: University of British Columbia, Vancouver, B.C., Canada
Lines: 33


Sure could use some hints for two problems:

1.	I'd like to periodically update just one record of a database
(.DO file) with fixed length records.  (A write of the whole file
takes too long.)  Any tricks?  I'd like to stick to BASIC if possible. 
I know that VARPTR can be used to return the address of the file
control block for a file descriptor, but I do not know the structure
of a file control block, or how to find the address (from BASIC) of
the first character of the .DO file.  Since the records are of fixed
length, I figured I could work from there, to do the selective record
updating ...

2.	What is the way to fix things so that control-c will not break
the execution of a BASIC program.  I only want shift-break to be able
to do this.  I note that my LAPDOS.BA program has this feature (but
peering at it does not help!).

I'd be interested to know of where I can find any books/documentation
on this kind of topic.

	Thanks for any help!

alistair@uu.bdc.ubc.ca
Alistair Blachford
Biosciences Data Centre, UBC
Vancouver, BC  Canada
(604)228-2645
-- 
Alistair Blachford			(604)228-2645
Biosciences Data Centre			Internet: alistair@bdc.ubc.ca
University of British Columbia		UUCP: ...ubc-cs!ubc-bdcvax!alistair
Vancouver, BC, Canada  V6T 1W5		BITNET: useralbl@ubcmtsg