From: James Britt <jamesUNDERBARb@...>
Date: 2004-09-18T00:49:16+09:00
Subject: Re: Debugging wxruby programs.

R. Cheung wrote:
> Hi,
> 
> Yes, I've installed both ruby and wxruby. The problem I have is that
> if the app fails to start, it is sometimes due to syntax errors and
> sometimes due to runtime errors (e.g. a nil member variable, etc.).
> Without a DOS/Command window, firstly, I've no idea if it's a syntax
> error, secondly, even if it does start, I can't use 'print' to print
> out debugging statements to help me find out where I got to and what
> went wrong (OK, I can open an auxilliary window and write to that, but
> I could lose that window if the app dies). How do you experts debug
> wxruby apps? Any help would be appreciated.


Have you tried to use a logger?

require 'logger'

$log = Logger.new( 'logfile.log' )
$log.level = Logger::DEBUG

# Now place logging calls in your code

$log.debug( "Haven't crashed yet! Good." )

I think the line number shows up someplace in each log-line prefix, but 
a quick hack if you're simply trying to trace key points is to use

$log.debug( __LINE__ ) # DELETE_ME

Easy to cut and paste through out code; easy to find and delete.  Easy 
to read the line number.


James