Re: [Audacity-devel] Audacity failed to read a file on C:

[Steve t. F. <ste...@gm...>]

Bump. Has this been logged or fixed?

Steve

On Mon, 23 Apr 2018 at 12:35, Steve the Fiddle <ste...@gm...>
wrote:

> On 19 April 2018 at 17:29, Steve the Fiddle <ste...@gm...>
> wrote:
> > On 19 April 2018 at 17:21, Paul Licameli <pau...@gm...>
> wrote:
> >>
> >>
> >> On Wed, Apr 18, 2018 at 11:26 AM, Steve the Fiddle
> >> <ste...@gm...> wrote:
> >>>
> >>> On 18 April 2018 at 13:55, Paul Licameli <pau...@gm...>
> wrote:
> >>> > No clues as to operating system and appplication versions?
> >>>
> >>> Windows (hence "c:")
> >>> I think all similar reports have been on Windows.
> >>> Most recent case, Windows 10, Audacity 2.2.2
> >>>
> >>> >
> >>> > The proximate source of that message is of course in
> >>> > FileExeption::ErrorMessage() which I wrote in 2.2.0, but by the time
> you
> >>> > reach the code that produes the message, and exception has "long ago"
> >>> > been
> >>> > thrown and caught, and you are not even in the catch-block any more,
> but
> >>> > instead in a delayed handler that runs in idle time of the event
> loop to
> >>> > give you a notification that there was a problem.
> >>>
> >>> So where is the exception thrown?
> >>>
> >>> >
> >>> > So if you do find a way to reproduce the messages, then to debug it
> >>> > further,
> >>>
> >>> I don't debug on Windows - I'm not sufficiently familiar with the
> tools.
> >>>
> >>> > you need to change settings of your debugger to break as soon as
> >>> > exceptions
> >>> > are thrown, or else find the places where an exception with
> Cause::Read
> >>> > is
> >>> > constructed, and put breakpoints there.
> >>>
> >>> OK, I see.
> >>> So why do we get a "Cause::Read" error when WriteSummary() fails?
> >>>
> >>> Would it not be more useful to have different error messages depending
> >>> on what has failed?
> >>>
> >>> Steve
> >>
> >>
> >> You are looking at the use of Cause::Read in ODPCMAliasBlockFile.cpp?
> >>
> >> Looks like I erred and should have used Cause::Write there, to give
> better
> >> information to the user.
> >>
> >> But this part of the code is very infrequently used.  This is for
> >> "on-demand" loading of large imported files in the background.
> >>
> >> You can see other uses of Cause::Read in raw data import -- not a usual
> use
> >> case -- and NotYetAvailableException, also special to on-demand
> loading.  I
> >> think the forum users would have mentioned that they were doing one of
> those
> >> unusual things?
> >>
> >> The direct usage of it in SimpleBlockFile::ReadData isn't reached,
> because
> >> mCache.active() is always false -- this looks like an abandoned old
> >> experiment with in-memory duplication of block file contents for longer
> >> durations.
> >
> > Thanks for the explanation Paul.
> > Will you fix those two bits (when you have a time)?
>
> Do I need to log it as a bug?
>
> >
> >>
> >> So really it's only the one use of Cause::Read in BlockFile.cpp that is
> >> likely to occur.
> >
> > I'm hoping that the user (most recent case) will upload his project
> > for us to look at - which may then cast some light on what is
> > occurring.
> > I'll keep you  informed.
>
> No additional useful information yet. He's just wanting to know why he
> can't open his project and we're running out of guesses.
>
> Steve
>
> >
> > Steve
> >
> >>
> >> PRL
> >>
> >>
> >>
> >>>
> >>>
> >>> >
> >>> > PRL
> >>> >
> >>> >
> >>> >
> >>> > On Wed, Apr 18, 2018 at 6:35 AM, Steve the Fiddle
> >>> > <ste...@gm...>
> >>> > wrote:
> >>> >>
> >>> >> OK, so how about the specific message:
> >>> >> "Audacity failed to read from a file on drive c:"
> >>> >>
> >>> >> My IDE does not understand the code, I don't understand the code,
> and
> >>> >> neither myself, other support crew or the user understand what this
> >>> >> message is saying.
> >>> >> OK, I get that Audacity may have failed to read something on drive
> C:,
> >>> >> but what, where, why, and how does the user fix it?
> >>> >>
> >>> >> Also, why are we seeing this problem regularly occur now? Does this
> >>> >> indicate a bug in Audacity?
> >>> >>
> >>> >> Steve
> >>> >>
> >>> >> On 17 April 2018 at 21:46, Steve the Fiddle <
> ste...@gm...>
> >>> >> wrote:
> >>> >> > On the forum we are quite regularly hearing of problems where
> users
> >>> >> > see error messages similar to "Audacity failed to read a file on
> C:"
> >>> >> > when attempting to open a project.
> >>> >> >
> >>> >> > I see that this is a group of similar messages.
> >>> >> > What precisely do these messages mean, and why do they occur?
> >>> >> >
> >>> >> > Steve
> >>> >>
> >>> >>
> >>> >>
> >>> >>
> ------------------------------------------------------------------------------
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> >>> >> _______________________________________________
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> >>> >> aud...@li...
> >>> >> https://lists.sourceforge.net/lists/listinfo/audacity-devel
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> ------------------------------------------------------------------------------
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> >>> > aud...@li...
> >>> > https://lists.sourceforge.net/lists/listinfo/audacity-devel
> >>> >
> >>>
> >>>
> >>>
> ------------------------------------------------------------------------------
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> >>> https://lists.sourceforge.net/lists/listinfo/audacity-devel
> >>
> >>
> >>
> >>
> ------------------------------------------------------------------------------
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