| Re: Debugging a widget program (someone else's) [message #84261] |
Thu, 09 May 2013 20:52  |
wlandsman
Messages: 743
Registered: June 2000
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Senior Member |
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Thanks Mike, the logging framework looks great for development of large projects. In my case, I was able to use PROFILER to list all the procedures used after pressing the widget button - though in alphabetical order rather than in the order they are called. But among the ~200 procedures listed, I was able to spot and debug the likely culprit. Cheers, --Wayne
On Thursday, May 9, 2013 7:14:42 PM UTC-4, Mike Galloy wrote:
> On 5/9/13 3:03 pm, wlandsman wrote:
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>> I'm looking for generic advice on how to debug a large widget
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>> program. Right now I press on a button and it displays an
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>> incorrect value. But I don't have any idea where to insert a
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>> breakpoint in the thousands of lines of code to debug the problem.
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>> Yes, I could look at the widget creation section for the button, then
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>> look for the event handler, and then try to follow the hierarchy of
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>> procedures until I find the function doing the calculations.
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>>
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>> What I would really like is some sort of procedure event log, that
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>> could show me in order the procedures and functions that are called
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>> after I press the button. Sort of like a reverse traceback that
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>> tells me where I am going rather than how I got where I am ;-)
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>>
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>> I vaguely recall reading about something like this, but maybe it
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>> wasn't in IDL.
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>>
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>> Thanks, --Wayne
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>>
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> You could use something like my logging framework, but that would
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> require putting a line in each routine you cared about. Something as
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> simple as:
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> mg_log, '', /debug
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> When the widget program was initialized, you would want to start up the
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> logging system with something like:
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> mg_log, level=5, filename='widget.log'
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> You can change the level to less than 5 to turn off the /DEBUG messages.
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> More information at:
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> http://michaelgalloy.com/2011/11/17/logging.html
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>
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> Mike
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> --
>
> Michael Galloy
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> www.michaelgalloy.com
>
> Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)
>
> Research Mathematician
>
> Tech-X Corporation
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