[Lazarus] Debugging: Some thanks is in order

Graeme Geldenhuys graemeg.lists at gmail.com
Fri Oct 16 08:42:49 CEST 2009


On Thu, 15 Oct 2009 09:44:26 +0200 (CEST)
Michael Van Canneyt <michael at freepascal.org> wrote:

> 
> 
> On Thu, 15 Oct 2009, Mattias Gaertner wrote:
> 
> > On Thu, 15 Oct 2009 09:09:27 +0200 (CEST)
> > Michael Van Canneyt <michael at freepascal.org> wrote:
> >
> >>
> >>
> >> On Wed, 14 Oct 2009, Hans-Peter Diettrich wrote:
> >>
> >>> Recently I stumbled into a situation where an unhandled exception
> >>> gave me the choice to either kill Lazarus, or to continue at my
> >>> own risk. Pressing the wrong shortcut key can be fatal in this
> >>> situation :-(
> >>>
> >>> IMO such a dialog, with severe consequences, should not use
> >>> standard OK/Cancel buttons, and also should not associate commonly
> >>> used shortcuts with the buttons. Instead more intuitive
> >>> Kill/Continue buttons should be used.
> >>>
> >>> In typical situations the Escape key is associated with Cancel,
> >>> meaning to abort or undo a wrong action. In the case of an
> >>> exception this should mean to cancel the *action* (and continue),
> >>> not to kill the *application*.
> >>
> >> I think that this is a good proposal.
> >> The QuestionDLG can be used for this, I assume.
> >
> > The MessageBox is used, because it can be handled completely
> > by the widgetset and therefore works even if the heap got corrupted.
> >
> > It is a matter of priority. Show some information to help fixing the
> > bug, or help the user to ignore the bug.
> 
> For a fact, the user usually cannot make this decision :-)
> 
> >
> > We could:
> > Add a flag to Application so that the programmer can decide what to
> > show (MessageBox/QuestionDlg).
> > And/Or: add an event to let the programmer show its own dialog.
> 
> This latter exists already, no ? OnShowException ?

At the moment it is not called.
This could be changed.

Mattias




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