Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
Well, I would say you have these options to trap the error:
  1. eval it and check for errors in $@
  2. use an if/else statement as above.
  3. use a little open B,"$blah" or error_subroutine("$!")#and do stuff in the routine.
The thing is, if you do not open the file successfully and do not write/read the data you want from/to the file correctly, it could (and most likely will) cause some problems down the road.

If you are using -w or warnings as you should, you might get those annoying little Use of uninitialized value errors which could keep your program from working at all.

The advice I would give you is, just die if something goes wrong because your program just might die later (unless you clog your program with double-checks everything). So, I would use this:
unless(open FH,"$file"){ open(LOG,">>$log") or die"Error writing to error-log file...how we +ird: $!"; print "Error at ",__LINE__," here's what happened: $!"; close LOG; }else{ proceed as normal.... }
UPDATE: Thank you to crazyinsomniac for pointing out that open FH, $file || or die; will always result as true and hence never fail. Three cheers for my hero! ;)


$_.=($=+(6<<1));print(chr(my$a=$_));$^H=$_+$_;$_=$^H; print chr($_-39); # Easy but its ok.

In reply to Re: q. on style/technique by damian1301
in thread Question on style/technique by synapse0

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 musing on the Monastery: (5)
As of 2024-04-16 13:22 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found