How to get stuff out of a GValue?
OK, I've got something in the form of a GValue (in this case, integer numeric data obtained with gtk_container_child_get()), and I'd like to get access to the actual number inside. How is this done? I've looked into GValue's documentation, but all I see is stuff that deals only with GValues and no interface to the outside world of regular C types. Any hints? --D. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: How to get stuff out of a GValue?
On Mon, 2007-11-19 at 11:50 +0100, Dan H wrote: > OK, I've got something in the form of a GValue (in this case, integer numeric > data > obtained with gtk_container_child_get()), and I'd like to get access to the > actual number inside. How is this done? I've looked into GValue's > documentation, but all I see is stuff that deals only with GValues and no > interface to the outside world of regular C types. > > Any hints? just one page further: http://library.gnome.org/devel/gobject/stable/gobject-Standard-Parameter-and-Value-Types.html usually, you get the type held by the GValue with G_VALUE_TYPE() and then switch; obviously, if you know the type of the property already then you can just use the right g_value_get_*() accessor. ciao, Emmanuele. -- Emmanuele Bassi, W: http://www.emmanuelebassi.net B: http://log.emmanuelebassi.net ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: How to get stuff out of a GValue?
Dan H wrote: > OK, I've got something in the form of a GValue (in this case, integer numeric > data > obtained with gtk_container_child_get()), and I'd like to get access to the > actual number inside. How is this done? I've looked into GValue's > documentation, but all I see is stuff that deals only with GValues and no > interface to the outside world of regular C types. > http://developer.gimp.org/api/2.0/gobject/gobject-Standard-Parameter-and-Value-Types.html tom ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: How to get stuff out of a GValue?
On Mon, 19 Nov 2007 10:56:35 +
Emmanuele Bassi <[EMAIL PROTECTED]> wrote:
> > Any hints?
>
> just one page further:
>
> http://library.gnome.org/devel/gobject/stable/gobject-Standard-Parameter-and-Value-Types.html
Ah, I'm using the Debian-supplied version 2.12.4, and your page refers to
2.14.3. Thanks. I guess it's just missing from my docs.
As it is, I'm having much more fundamental problems. I'm trying to do this to a
GtkWidget *child inside GtkTable *table:
-
GValue left_attach;
gtk_container_child_get(GTK_CONTAINER(table), child,
"left-attach", &left_attach, NULL);
g_printerr("%s\n", g_strdup_value_contents(&left_attach),
-
And I'm getting this error:
GLib-GObject-CRITICAL **: g_strdup_value_contents: assertion
`G_IS_VALUE (value)' failed
Why?
--D.
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Re: How to get stuff out of a GValue?
On Mon, 2007-11-19 at 12:18 +0100, Dan H wrote:
> On Mon, 19 Nov 2007 10:56:35 +
> Emmanuele Bassi <[EMAIL PROTECTED]> wrote:
>
> > > Any hints?
> >
> > just one page further:
> >
> > http://library.gnome.org/devel/gobject/stable/gobject-Standard-Parameter-and-Value-Types.html
>
> Ah, I'm using the Debian-supplied version 2.12.4, and your page refers to
> 2.14.3. Thanks. I guess it's just missing from my docs.
nope: it's been there for ages. :-)
> As it is, I'm having much more fundamental problems. I'm trying to do this to
> a GtkWidget *child inside GtkTable *table:
> -
- GValue left_attach;
+ GValue left_attach = { 0, };
+
+ g_value_init (&left_attach);
+
gtk_container_child_get(GTK_CONTAINER(table), child,
"left-attach", &left_attach, NULL);
g_printerr("%s\n", g_strdup_value_contents(&left_attach),
+
+ g_value_unset (&left_attach);
> -
>
> And I'm getting this error:
>
> GLib-GObject-CRITICAL **: g_strdup_value_contents: assertion
> `G_IS_VALUE (value)' failed
>
> Why?
because you need to initialise the GValue, if it's on the stack. you
also need to unset it to free its contents.
ciao,
Emmanuele.
--
Emmanuele Bassi,
W: http://www.emmanuelebassi.net
B: http://log.emmanuelebassi.net
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Re: How to get stuff out of a GValue?
On Mon, 19 Nov 2007 11:33:36 +
Emmanuele Bassi <[EMAIL PROTECTED]> wrote:
Hallo Emmanuele,
it's not getting better. Here's my code. li->data points to a cild of the
table, and the code compiles without warnings with -W -Wall:
-
g_value_init(&value, G_TYPE_INT);
gtk_container_child_get(GTK_CONTAINER(table), li->data,
"left-attach", &value, NULL);
g_printerr("%s\n", g_strdup_value_contents(&value));
g_value_unset(&value);
-
and on running it, I still get this error:
GLib-GObject-CRITICAL **: g_value_unset: assertion `G_IS_VALUE
(value)' failed
Strangely, when I comment-out the call to gtk_container_child_get(),
g_strdup_value_contents(&value) just returns "0" (as expected). It seems to be
gtk_container_child_get() that somehow messes up the value.
--D.
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GUI problem.
Hi. I'm trying to develop a small application. Problem: I have a table with some buttons. I pass the pointer to the table in a thread, in that thread i would update the table with a some new buttons. The buttons will appeare but are not 'clickable'! Why? if I try return thay works but with the mouse no. Someone can help me? Thanks ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: How to get stuff out of a GValue?
Le lundi 19 novembre 2007 à 11:33 +, Emmanuele Bassi a écrit :
> On Mon, 2007-11-19 at 12:18 +0100, Dan H wrote:
> > On Mon, 19 Nov 2007 10:56:35 +
> > Emmanuele Bassi <[EMAIL PROTECTED]> wrote:
> >
> > > > Any hints?
> > >
> > > just one page further:
> > >
> > > http://library.gnome.org/devel/gobject/stable/gobject-Standard-Parameter-and-Value-Types.html
> >
> > Ah, I'm using the Debian-supplied version 2.12.4, and your page refers to
> > 2.14.3. Thanks. I guess it's just missing from my docs.
>
> nope: it's been there for ages. :-)
>
> > As it is, I'm having much more fundamental problems. I'm trying to do this
> > to a GtkWidget *child inside GtkTable *table:
> > -
>
> - GValue left_attach;
> + GValue left_attach = { 0, };
> +
> + g_value_init (&left_attach);
> +
I always though that this requirement was error prone. You just get to
initialize
your GValue twice to make it OK. A lot of beginners hit this error. The
doc says "A zero-filled (uninitialized) GValue structure." which looks
like an oxymoron :)
--
Benoît Dejean
GNOME http://www.gnomefr.org/
LibGTop http://directory.fsf.org/libgtop.html
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