[pygtk] How to stop mainloop from catching exceptions

[Aaron Optimizer Digulla]

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Quoting Aaron Optimizer Digulla <digulla@hepe.com>:

> I'm currently working on a patch for pygtk-0.6.5 which will call
> a user-callback in case of an error. That would allow to open a
> window with a trace instead of silently dying.

Ok, here is the patch. It will add a function 
"pygtk_set_exception_handler" to gtk.py which allows to specify a
function or method (anything callable) which will be called when
an exception occurrs. Try this:

  import os
  os.environ['PYGTK_FATAL_EXCEPTIONS'] = '1'

  def handler ():
    import traceback
    print 'GOTCHA'
    traceback.print_exc ()
    mainquit ()

  pygtk_set_exception_handler (handler)

pygtk_set_exception_handler() will return the last installed
handler, so you can implement a stack if you want/need that.

The C code which calls the handler has a fallback mode. If
there are errors calling the handler (for example, an exception
in the handler), it will default to the old behaviour. There is
just one thing different: When the env variable PYGTK_FATAL_EXCEPTIONS
is set, then it will still print the exception and *then* it
will abort (the current code will just silently exit so you will
never know what happened).

Have fun,

-- 
==============================================
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----------------------------------------------
Aaron "Optimizer" Digulla, digulla@sowatec.com
==============================================


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