On 08/07/2010 22:34, Alex wrote:
Hello
In my WPF application, I want to have an "expert mode" that lets the
end-user write inline python code targetting one specific control (a
sheetmusic). I embed IronPython and when the user code throws an
exception I catch it and display it but there are a few foolproof
problems:
1) If the user write some bad code in a function and binds it to one
of the control event, it will crash the whole app. Of course I can
recommand my users to always wrap event handlers into a try catch
block (or ask to use a decorator that do it) but it's not really
foolproof. I want to make it impossible to crash the whole app with
user code. Perhaps native events mecanism is a bit too low-level to be
foolproof?
Catch and report exceptions.
2) If the user code makes an infinite loop it will hang the whole
app. I want to have a "panic button" to stop the script (and even
restart the python engine if necessary). I suppose I have to run user
code in a worker thread but then the user have to use Invoke mecanisms
each time he touchs an UI object? Is there an elegant pattern that
deals with this concerns?
Execute the user code on a background thread. Provide a means for
actions to be invoked on the gui thread (wrapped in exception handling)
if necessary. Provide a button to abort the thread if it goes on too long.
Michael
This questions are more about .NET and patterns than IronPython, but I
figured some of you have already thought about it in your IP
experience. Thanks for any advices!
Alex
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