Re: Parameter passing advice...

["Tara M" <learfox furry ao net>]

On Tue, 25 Sep 2001 13:45:26 -0400 (EDT), Chris Elston said:


>  Sometimes, one parameter is not enough.  What methods have you all used in
>  the past to get around having only one gpointer at your disposal when you
>  need much more?  GLists?  Arrays?  some kind of hack around with regards
>  to the nature of void pointers?


Here's a generate rule that's helpful for beginners.

For any signal who's name is of the format "<whatever>_event"
(like "button_press_event") the inputs for the callback function
is:

gint (*func_cb)(GtkWidget *widget, GdkEvent *event, gpointer data)


For all other signal names, just look at the header files, say
you want to find the inputs for the "select_row" signal generated
by the GtkCList.  Look at gtk/gtkclist.h and look for the class
(specifically, _GtkCListClass).

Look at the prototype:

void   (*select_row)          (GtkCList       *clist,
                                 gint            row,
                                 gint            column,
                                 GdkEvent       *event);

So the "select_row" signal takes those inputs as you see PLUS
a gpointer data at the end.  ALWAYS append a gpointer data to the
end, so your callback function should look like:

void (*func_cb)(GtkCList *clist, gint row, gint column, GdkEvent event,
gpointer data)


Hope that helps!


-- 
--
Sincerely,                  ,"-_                         \|/
-Capt. Taura M.             ,   O=__                    --X--
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                  http://furry.ao.net/~learfox/