Re: Defining Callback without arguments

[Olexiy Avramchenko <olexiy irtech cn ua>]

Shiraz Baig wrote:

> I have defined a callback function for "clicking" of a
> button. I have not used the normal form of 
>
>   callback(GtkWidget *widget, gpointer data).
>
> Instead, I have used a callback without any arugments.
> (See the example given below).
>
> My question is 
>
> "Is there anything wrong in doing so, when I do not
> need to dereference the widget or the data?"
>
> My program is working perfectly fine. I just want to
> find out, if there could be some potentional problems
> with my program.
>
> My code is as under:
>
> void anyfunc()
> {
>  g_print("Reached here.\n");
> }
>
> main()
> {
> .............
>  button = gtk_button_new_with_label("SEND");
>  gtk_box_pack_start(GTK_BOX(hbox), button, TRUE,
> TRUE, 10);
>  gtk_signal_connect(GTK_OBJECT(button), "clicked",
>                       GTK_SIGNAL_FUNC(anyfunc),
> NULL);
> .........
> }
All is OK, because you're trying this in "C" language. The "C" will 
normalize the stack *after* the call, so you did nothing wrong.
Other languages (for example "Pascal") doing the stack normalization 
inside the function - in this case you'll get a bug.

God bless "C" ;)

Olexiy