Re: Using drag and drop to set where data should be saved

In article
<[email protected]>,
   Thomas Leonard <[email protected]> wrote:
> On 7 June 2010 17:56, Stephen Watson <[email protected]> wrote:
> > Jim Lesurf <[email protected]> wrote:

[snip]

> >>
> >> and it works quite nicely for A and B above. So I'm hoping that there
> >> is a simple way to extract the full pathname of the file created by
> >> the drag-and-drop and then pass that on to launching the main code.
> >> Is there not a method for reading this name from the class of object
> >> for 'box'.
> > etc?
> >
> > As I recall, the ROX-Lib version expects the call back to create the
> > target file before returning and throws an exception if it doesn't.
> >  You'll need to catch that if you're deferring file creation to a
> > different process.

> Note that you may be asked to save to a temporary file (e.g. when
> transferring data to another program), so it's important not to return
> until the file is written.

> Archive shows how to do it, although it's a bit complicated because it
> supports so many different operations and because it reads and writes at
> the same time.

Being able to read and write at the same time is also something I'd like to
be able to do using dnd since a number of my programs read though one
(often long) wave file and write out results or a modified WAV file as they
go.

> One quick way to get started would be to add your own format to
> Archive/formats.py. Each format is just a shell command that produces
> the output. e.g. this line

>   Archive('zip',	   "zip -qr - '%s'", 'application/zip'),

> means that if the user chooses the "create zip" option then we run the
> command "zip -qr - <name>". You could add your own command here.

> To add your own code, you have a choice of which method to provide:

> 	def save_to_file(self, path): or 	def save_to_stream(self, stream):

> In your case, as you need the name, choose the first.

Ah! :-)  Thanks very much for the above. That is very helpful.

I have been looking at Archive but it has been making blood emerge from my
forehead trying to understand it as I currently know so little about python
and ROX-Lib. The above looks like it will help me a great deal in finding
how to adapt the code to do the kinds of things I have in mind. Excellent. 
:-)

Slainte,

Jim

-- 
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