Re: Passing custom parameters

["Jim George" <jimgeorge gmail com>]

On 9/28/06, Sumedh <sumedhk ftml net> wrote:
> Gtk - C
>
> how to pass multiple arguments to a function from a widget. eg i have
> two text entry widgets
>
> and one button. What i want to do is that when i click the button i
> should be able to
>
> print(terminal) the contents of both the text entry widgets. Right now i
> can print from only one
>
> widget.
>
>
>
> g_signal_connect accepts only 4 arguments. The last one is the data
> pointer when i pass
>
> another data pointer as 5 arguments, gtk spits an error which says that
> only 4 arguments
>
> are valid.

Here's how I'd do it:

struct my_params {
 GtkEntry *e1, *e2;
 int my_other_param;
}

...

struct my_params mp;
mp.e1 = ...;
g_signal_connect(G_OBJECT(button), "clicked", callback, &mp);

...

void callback(GtkButton *b, gpointer data)
{
 struct my_params *mp = data;

 /* use mp->e1 and mp->e2 */
}