[Qt-interest] Force file extension with QFileDialog::getSaveFileName?

[Constantin Makshin]

I totally agree changing file extensions (at least, without asking the user) is a very bad idea. But that's how I understood original David's question ("ensure the result of this dialog ends with one of the valid extensions specified by the filter") — if the user doesn't specify any extension or specifies "invalid" one, enforce using one of "valid" values. Probably David wasn't clear enough and I misunderstood his message...

On Tuesday, June 21, 2011 11:13:26 PM Atlant Schmidt wrote:
> Constantin:
> 
> > "Brute force" method - if the user specifies incorrect
> > extension (e.g., enters "foo.exe" into the file name
> > box when saving a picture), replace it or simply append
> > a valid one when opening the file.
> 
>   It's a *HUGE* violation of Human Interface Design
>   Principles to do something like this. Reject an
>   extension/filetype if you don't like it, but don't
>   you dare change it behind the user's back to suit
>   your needs. That would certainly violate the principle
>   of "least surprise" and on some systems, might end up
>   with the user confused about why, having typed "foo.ppm",
>   the program is now asking them if they want to over-write
>   the exitsing "foo.bmp". (Or even worse yet, maybe the
>   program simply silently over-writes their existing .bmp
>   file with new contents; that loss-of-data accident could
>   spell a lawsuit!)
> 
>                               Atlant
> 
> 
> -----Original Message-----
> From: qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com [mailto:qt-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com] On Behalf Of Constantin Makshin
> Sent: Tuesday, June 21, 2011 11:51
> To: Qt Interest
> Subject: Re: [Qt-interest] Force file extension with QFileDialog::getSaveFileName?
> 
> "Brute force" method - if the user specifies incorrect extension (e.g., enters "foo.exe" into the file name box when saving a picture), replace it or simply append a valid one when opening the file.
> 
> On Tuesday, June 21, 2011 07:40:47 PM David Doria wrote:
> > When I use QFileDialog::getSaveFileName, it allows the user to type
> > any file name. What I would like to do is ensure the result of this
> > dialog ends with one of the valid extensions specified by the filter
> > (*.png *.bmp - etc). Is there an option for this?
> >
> > Thanks,
> >
> > David
> 
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