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Re: XML log files

by pg (Canon)
on Dec 06, 2002 at 04:48 UTC ( #217984=note: print w/replies, xml ) Need Help??

in reply to XML log files

Wait a minute, I know that +< and seek can make things quite complex, and too many seeks may lower the performance, but we have to look at this case by case. If we can write a program by using seek and +<, yet it is very neat and no performance issue, then why not?
use Fcntl qw(SEEK_CUR SEEK_END); #import constant use strict; use warnings; use constant CLOSING_TAG => "</events>"; #deinfe the closing tag as co +nstant my $event1 = "<event time=\"time1\" type=\"type1\"><detail>detail1</de +tail></event>"; open(LOGFILE, "+<", "log.xml"); seek(LOGFILE, -length(CLOSING_TAG), SEEK_END); my $cur_char; #you may have newlines, blanks etc after the closing tag #that's why we do the following to make the program robust do { sysread(LOGFILE, $cur_char, 1); seek(LOGFILE, -2, SEEK_CUR) if ($cur_char ne "<"); } until ($cur_char eq "<"); seek(LOGFILE, -1, SEEK_CUR); print LOGFILE $event1 . "\n"; #you can do as many prints as you want before close #no more seek, we did it once and forever print LOGFILE CLOSING_TAG; close(LOGFILE);

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