RE: incompatible pointer type?

["Kevin Vandersloot" <kfv101 hotmail com>]

Hi Shane. Probably the list variable should be cast to GTK_CLIST (list), 
though you don't show where it is defined.

Casting is something you'll be doing a lot in gtk. The way to tell if it is 
necessary is to look at the api for a call. For instance look at 
gtk_clist_new. It returns a *GtkWidget. Now look at gtk_clist_set_text. The 
api states that the first argument is of type *GtkClist. That means that you 
need to cast the *GtkWidget variable returned from gtk_clist_new to a 
*GtkClist variable. The way to do that is through the macro GTK_CLIST. The 
macros are pretty consistent - to cast to GtkEditable use GTK_EDITABLE, to 
cast to GtkLable use GTK_LABEL etc. The macros are defined in the header 
files or the api reference should indicate what is the necesarry macro.

Hope that helps,
Kevin


> From: "Clancy, Shane W." <SCLANCY northropgrumman com>
> To: 'Jens Askengren ' <jensus linux nu>
> CC: "'gnome-devel-list gnome org '" <gnome-devel-list gnome org>
> Subject: RE: incompatible pointer type?
> Date: Tue, 12 Mar 2002 06:55:30 -0800
>
>
> Jens,
> Thank you.  The code now compiles.  It doesn't work, but it compiles.
>
> A few additional questions if you don't mind.  Where would I look for more
> information on macros (what they do, what macros are offered for gtk/gnome,
> etc)?  When i click on the apply button, the following shows up on the
> terminal window i kicked the app off from:
>
> Gtk-CRITICAL **: file gtkclist.c: line 2229 (gtk_clist_set_text): assertion
> `GTK_IS_CLIST (clist)' failed.
>
> Any thoughts?
>
> Thank you again.
>
> Shane
>
> -----Original Message-----
> From: Jens Askengren
> To: Clancy, Shane W.
> Cc: gnome-devel-list gnome org
> Sent: 3/12/02 9:30 AM
> Subject: Re: incompatible pointer type?
>
> tis 2002-03-12 klockan 14.50 skrev Clancy, Shane W.:
>
> > here is the offending function:
> >
> > void
> > on_apply_button_clicked                (GtkButton       *button,
> >                                         gpointer         user_data)
> > {
> > 	gchar 	text[2];
> > 	gint	  i;
> >
> 	/* Use the GTK_EDITABLE-macro here:
> > 	 text[0] = gtk_editable_get_chars (col1_combo, 1, -1);
> > 	 text[1] = gtk_editable_get_chars (col2_combo, 1, -1);
> 	*/
>  	 text[0] = gtk_editable_get_chars (GTK_EDITABLE(col1_combo), 1,
> -1);
>  	 text[1] = gtk_editable_get_chars (GTK_EDITABLE(col2_combo), 1,
> -1);
> >
> > 	for (i = 0; i < 2; i++){
> 		/* the code lacks a closing ) */
> > 		gtk_clist_set_text ( list, row, col, text[i];
> 		*/
> 		gtk_clist_set_text ( list, row, col, text[i]);
> > 		col++;
> > 		}
> > 	row++;
> >
> > }
> >
>
>
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