OpenEuphoria

Re: Opening a file - File Open Dialog spoils future code

• Posted by Matt Lewis <matthewwalkerlewis at ?mail.co?> Jan 16, 2008
• 554 views

CChris wrote:
> 
> I am only saying two things:
> 1/ since ex.err may land in folders from where no Eu rogram was ever run,
> other processes must interfere in some cases (in case of a crash? I don't
> know);
> 2/ since use of the current directory is so confusing for practical use
> under Windows, and since there is such an excessive concern about avoiding
> confuion in the language, I think relying on what the "current directory"
> happens to be in an only mildly deterministic way (from the user standpoint)
> should be actively discouraged in some way.

OK, I definitely think we need to investigate this some more, including to
find a repeatable way to mess up the current dir so that it does not 
behave in the obvious way.  I'm not convinced yet that there is strange
behavior, though I wouldn't be terribly surprised if there were some 
difference based on using the c-library routine vs the Win32 routine.
That should be fairly easy to test.  There may be other ways to change 
the current dir, such as opening a file (at least from the c-library's 
perspective--again, some testing is required).
 
> To reply to Pete's post: I don't think this would be win32lib's job. The
> interpreter should lock the "current directory" for exw[c].exe to be the
> one where the file which is being run lies, and nullify any change not
> deliberately made by the .exw being run. Otherwise, users should be
> specifically advised about the seemingly random changes it may undergo
> and their consequences.

I think that if a library does something that may interfere with the user
(such as calling chdir) then the library should either attempt to restore
whatever it changed, or at least document when something like that changes,
so that users will be able to understand that they might need to check
for it.

Matt