[pygtk] GIO async operations

[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. 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):
	# 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
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