Re: How to copy data between widgets?

["RomÃn Gorojovsky" <rgorojovsky gmail com>]

On 8/8/06, Lance Dillon <riffraff169 yahoo com> wrote:
> > From: RomÃn Gorojovsky <rgorojovsky gmail com>
> > To: gtk-app-devel-list gnome org
> > Sent: Tuesday, August 8, 2006 10:07:06 AM
> > Subject: How to copy data between widgets?
>
> > Hi all, sorry if this is a FAQ, but I've been reading the docs and I
> > couldn't find the answer.  Not being too fluent in english, I couldn't
> > find it in the archives, since I don't know what to look for.
>
> > The problem is the following.  I have a text entry, a button and a
> > label.  I want the label to display the text in the entry when you
> > press the button.
>
> > So far I've used g_signal_connect_swapped() connecting the "clicked"
> > signal on the button with a callback that takes a pointer to the label
> > as data.  But I couldn't pass more than that, so I could't pass a
> > string nor the text entry.
>
> But you can pass any kind of pointer, so make a struct, something like this:
>
> struct my_data {
>   GtkLabel *l;
>   GtkEntry *e;
> };
>
> Then pass a pointer to an instance of your struct.  Now you have both widgets available in your callback.

Ok, thanks, I'll try that.

In fact I had alredy tried and falied, but that could be a problem in
my C-fu, not in my GTK-fu.....

IIRC I did

  GtkWidget *label;
  struct my_data *data;

  /* Initialize label */

  data->l = label;

and got a Segmentation fault there.  But I'll try again I guess....

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--
RomÃn