El mar, 03-11-2009 a las 07:39 -0800, Steve Harrington escribió:
> I am trying to use g_object_get_data() to retrieve the GtkWidget * of an
> object. Seems simple enough but The attached code doesn't work. I must
> have missed something simple but darned if I can see it.
Indeed - g_object_get_data retrieves data explicitly set on an object
with g_object_set_data. No call to the latter in your code ...
Use something like the following snippet to make it work:
> Main = GTK_WIDGET( gtk_builder_get_object(builder, "Main") );
g_object_set_data( G_OBJECT(Main),
"Button",
gtk_builder_get_object(builder, "Button") );
> gtk_builder_connect_signals( builder, NULL );
> g_object_unref( G_OBJECT(builder) );
> gtk_widget_show_all( Main );
> gtk_main( );
Another annotation just in case:
> void GTKButtonCB( GtkWidget *widget, gpointer data )
> {
> GtkWidget *W;
>
>
> if( (W = g_object_get_data(G_OBJECT(Main), "Button")) != NULL )
> {
> GtkWidget *dialog;
> dialog = gtk_message_dialog_new( NULL,
> GTK_DIALOG_DESTROY_WITH_PARENT,
> GTK_MESSAGE_ERROR,
> GTK_BUTTONS_CLOSE,
> "%s",
> "GTKButtonCB" );
> gtk_message_dialog_format_secondary_text( GTK_MESSAGE_DIALOG(dialog),
"Found \"Button\" widget%s",
W == widget ? ", which is passed as callback
parameter"
: "");
> gtk_dialog_run( GTK_DIALOG(dialog) );
> gtk_widget_destroy( dialog );
> }
So in case of the example, g_object_get_data is not necessary, as the
button widget is directly available to the callback handler.
Hope the above snippets are helpful.
Happy hacking,
Florian
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