|Perl: the Markov chain saw|
Error Handling Misconceptionby Anonymous Monk
|on Sep 03, 2003 at 22:04 UTC||Need Help??|
Anonymous Monk has asked for the
wisdom of the Perl Monks concerning the following question:
Warning: I have never used eval to error-handle before. I've been avoiding it for more than a year now. I thought I had seen enough examples to be sure how it worked. Obviously I was wrong.
I have code that both creates and loops over objects. The details of the objects shouldn't matter too much, I think. I normally use this object like so:
But I am using this object in a CGI, and I thought I had best catch problems gracefully, with some nice error explanation rather than just a 500 error. I wanted to use syntax like:
This didn't quite work as I expected, though, and I'm not sure why. This code works just fine if the eval succeeds, but it never gets to my error-handling code, even if the eval fails. I have also tested adding the same error-handling code after my while loop.
So, I seem to have some misconception about how eval should behave: can anybody point it out to me, please?