Fake a signal

Submitted by neocruze on Sat, 03/01/2008 - 19:20.

can we fake a signal occurrence.............

i mean button clicked signal occurs even when nobody clicks anything ........

or

fake a signal occurrence......

even when actual click or event never happened .........

Re: Fake a signal

Submitted by gtkgalaxy on Sun, 03/02/2008 - 05:52.

these functions can be used
gtk_signal_emit (GTK_OBJECT(button), EVENTNAME,
args);

void gtk_signal_emit_by_name (GtkObject *object,
const gchar *name,
...);

here emit function takes Event value defined and
arguments for that particular signal handler.

emit_by_name function is suitable for you
where u can specify events like "clicked" etc.
This will emit a fake signal and you can goto your
button handler function registered using gtk_signal_connect
This functions avoid using your own signal handling loop
which i mentioned previously.

use gtk_signal_emit_by_name.

GtkGakaxu
www.gtkhelp.com
Gtk help team

Re: Re: Fake a signal

Submitted by neocruze on Sun, 03/02/2008 - 15:07.

On March 2nd, 2008 neocruze says:

well i am trying but no success till now..........

this is the signal that i have to fake ......

g_signal_connect (G_OBJECT (button), "clicked",G_CALLBACK (hello), NULL);

to call function name hello

i tried this ...

gtk_signal_emit_by_name(GTK_OBJECT(button),"clicked",G_CALLBACK (hello), NULL);

it compiled well but on runtime i got this.....

(no:4543): Gtk-CRITICAL **: gtk_signal_emit_by_name: assertion `GTK_IS_OBJECT (object)' failed

so what should i add in

gtk_signal_emit_by_name

.....

Hi friend, for

Submitted by gtkgalaxy on Mon, 03/03/2008 - 17:53.

Hi friend,
for gtk_signal_emit_by_name you should
pass callback's argument list
not callback itself

below i attached my tested sample
code for this fake signal.
When you click button 1
signal handler of button 2 is called.

see below code
/* Sample code from www.gtkhelp.com
* Gtk Help Team
*
*
*
*
*
*
*
*
*
*
*
*
*/

#include
#include

//Button2 callback

void
hello (GtkWidget * button, gpointer data)
{
printf ("hello B2 clicked\n");
}

//Button 1 callback
//this will generate a fake signal for button2
void
b1_clicked (GtkWidget * button, gpointer data)
{
GtkWidget *b = (GtkWidget *) data;
printf ("in b1\n");
//argument list is the arguments given to callback function
gtk_signal_emit_by_name (G_OBJECT (b), "clicked", b, NULL);
}

//main code
main (int argc, char **argv)
{
GtkWidget *button1, *button2, *fixed;
GtkWidget *window;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size (window, 400, 400);
gtk_window_set_title (GTK_WINDOW (window), "TEST");
fixed = gtk_fixed_new ();
gtk_widget_show (fixed);
gtk_container_add (GTK_CONTAINER (window), fixed);
button1 = gtk_button_new_with_label ("B1");
button2 = gtk_button_new_with_label ("B2");
gtk_fixed_put (fixed, button1, 10, 5);
gtk_fixed_put (fixed, button2, 50, 5);

//button2
g_signal_connect (G_OBJECT (button2), "clicked", G_CALLBACK (hello), NULL);

//button1
g_signal_connect (G_OBJECT (button1), "clicked", G_CALLBACK (b1_clicked),
button2);

gtk_widget_show_all (window);
gtk_main ();
}

Re: Re: Fake a signal

Submitted by neocruze on Sun, 03/02/2008 - 15:08.

.

yes you can

Submitted by gtkgalaxy on Sat, 03/01/2008 - 19:45.

you may have to call different
functions with while(1) loop
instead of gtk_main
code snippet i will update soon.