[pygtk] GIO async operations

[Christian Becke]

Am 22.02.2011 12:37, schrieb Christian Becke:
> Am 22.02.2011 05:29, schrieb Jason Heeris:
>> I'm confused about some of the GIO async functions. In my case, I want
>> to use gio.File.replace_contents_async(). But what's the signature of
>> the callback it takes? I would assume that the callback receives the
>> original File object, but looking at the docs for gio.AsyncResult, it
>> might also need to take other arguments:
>>
>> "This callback will be triggered when the operation has completed, and
>> will be passed a GAsyncResult instance filled with the details of the
>> operation's success or failure, the object the asynchronous function
>> was started for and any error codes returned."
>>
>> This sentence is a bit grammatically imprecise :P I'm not sure whether
>> the "object the asynchronous function was started for" is part of (a)
>> what is passed to the callback, or (b) the contents of the
>> GAsyncResult.
>
> It's neither nor.

Sorry, misread your message. The object is actually both: passed as an 
argument to the callback, and accessible through the gio.AsyncResult by 
calling its get_source_object method, see code below:

It's the object on which you called the
> replace_contents_async method (usually a gio.File):
>
> import glib
> import gio
>
> mainloop = None
>
> def callback (gfile, result):
	print gfile is result.get_source_object () # prints "True"
> # gfile will be the same object as below
> try:
> gfile.replace_contents_finish (result)
> print "success"
> except gio.Error, error:
> print error
> finally:
> mainloop.quit ()
>
> gfile = gio.File (uri="file:///tmp/test.txt")
> gfile.replace_contents_async ("Hello!\n", callback)
>
> mainloop = glib.MainLoop ()
> mainloop.run ()
>
>> In either case, how do I use it? Presumably the return value from
>> replace_contents_finish() is the same as from replace_contents() (an
>> etag). But do I need to pass the GAsyncResult to
>> replace_contents_finish(), so that it's populated with any error
>> codes? Or are the error codes passed into the callback?
>
> See above for how to deal with errors.
>
>>
>> Any clarifying comments welcome :)
>>
>> — Jason
>> _______________________________________________
>> pygtk mailing list pygtk at daa.com.au
>> http://www.daa.com.au/mailman/listinfo/pygtk
>> Read the PyGTK FAQ: http://faq.pygtk.org/
>
>


-- 
--
Christian Becke

Sprengelstr. 8
13353 Berlin

Phone: +49 (0)30 45 02 90 23
Mobile: +49 (0)160 7 43 88 88
Email: christianbecke at gmail.com