Re: g_signal_connect question

[David Malcolm <dmalcolm redhat com>]

On Wed, 2004-08-04 at 04:37 +0000, deepspace wrote:
> Hi ;)
> I am having a strupid problem here , and i hope someone will take the 
> time to help me out
> i know what i am doing is wrong but i can't find the right way to do it.
> look at the code
> 
> 
> struct args{
>      gint numdice;
>      gint sides;
>       };
> 
> void roll(struct args * p)
> {
> g_print("IN FUNC sides is %d \n",p->sides);
> }
> int main(int argc, char *argv[])
> {
>         GtkWidget *window;
>         GtkWidget *button1;
> 
>         struct args arg,*p;
>         arg.numdice=(gint)1;
>         arg.sides=(gint)10;
>         g_print("sides is %d\n",arg.sides);
> 
>         p= &arg;
>         g_print("sides by pointer is %d\n",p->sides);
> 
>          gtk_init(&argc,&argv);
> 
>         window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>         button1= gtk_button_new_with_label("button1");
>         
> g_signal_connect(GTK_OBJECT(button1),"clicked",GTK_SIGNAL_FUNC(roll),p);
> 
>         gtk_container_add (GTK_CONTAINER(window),button1);
>         gtk_container_border_width(GTK_CONTAINER(window),15);
>         gtk_widget_show(window);
>         gtk_widget_show(button1);
> 
>         //main loop
>         gtk_main();
> 
>         //end
>         return 0;
> }
> 
> ok , so until the gtk_main  arg.sides is 10 as it should be ...
> but upon the start of the application , when i click the button and 
> roll() is called p.sides becomes 7 and p.numdice 1035929
> why?
> how can it be fixed?
> isn't this the way to pass arguments to the function through 
> g_signal_connect?

Your callback function needs more arguments; it needs to be something
like
void roll (GtkButton *button, struct args *p);

Look up the documentation for the signal you're connecting to get it
exactly right.

Currently the values you're seeing are due to the GtkButton object being
treated erroneously as a struct args


> 
> thank you for reading
> :)
> DsP
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