Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
For reasons similar to "it seems like a good idea" and "why not", I'd like to change the format of a logfile I write to being XML in the next format. But there's a minor problemette.

Normally when I update a logfile I do

open (LOGFILE,">>$logfn"); print LOGFILE, $eventinfo; close (LOGFILE);
which just appends whatever was in $eventinfo to the end of the file. I'd like to do the same thing with the new XML based one which would mean the logfile would look like:
<event time='1234' type='this'> <detail>blah</detail><detail>blahblah</detail> </event> <event time='1236' type='this'> <detail>blah</detail><detail>blahblah</detail> </event> <event time='2234' type='that'> <detail>weeble</detail><detail>blahblah</detail> </event>
Unfortunately if I try to use XML::Simple (or any other XML reader come to think of it) to process the logfile as is it barfs because there are no <rootelement></rootelement> tags surrounding the event list.

Clearly the starting <rootelement> tag is easy to insert in the logfile. My problem is the final </rootelement> tag because what I need to do is overwrite that with $eventinfo.'<rootelement>' and when you open using append you can't do this.

It seems to me an alternative would be to provide the XML::Simple reader with fake <rootelement> tags, but there doesn't seem to be a way to do this without reading the whole file in once anyway which could be messy if it gets large.

Anyone got any suggestions other than using open(LOGFILE, "+<$logfn") and some horrible "seek"ing?

Dingus


Enter any 47-digit prime number to continue.

In reply to XML log files by dingus

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others surveying the Monastery: (5)
As of 2024-03-29 11:45 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found