Hi Salvador,
Something is not ok with your example, because in your example plotbox is a
local variable that is left uninitialized. What you want to do is to pass a
pointer to plotbox to the callback function, which may be done in a number
of ways. One is to use the third parameter of the callback function. Another
option is to use g_object_set_data() to the button that you may then
retrieve through g_object_get_data() and a third method is too use global
variables.
Hope this helps.
Dov
2008/10/24 Salvador Aguinaga <[EMAIL PROTECTED]>
> I have a button that fails to update the graph on my main window, and does
> I figured I am doing something wrong.
>
> Here is the error msg when I press the button:
>
> SynchioButton I was clicked!
> (harp_app_0:5279): GLib-GObject-WARNING **: invalid cast from
> `GtkDataboxLines' to `GtkDatabox'
> ** (harp_app_0:5279): CRITICAL **: gtk_databox_graph_add: assertion
> `GTK_IS_DATABOX (box)' failed
> (harp_app_0:5279): GLib-GObject-WARNING **: invalid cast from
> `GtkDataboxLines' to `GtkDatabox'
> ** (harp_app_0:5279): CRITICAL **: gtk_databox_calculate_extrema: assertion
> `GTK_IS_DATABOX (box)' failed
> (harp_app_0:5279): Gtk-CRITICAL **: gtk_widget_show: assertion
> `GTK_IS_WIDGET (widget)' failed
>
>
> The call in the interface.c file is like this:
>
> /* SYNCH IO BUTTON CALLBACK */
>
> g_signal_connect (G_OBJECT (synchioButton), "clicked",
>
> G_CALLBACK (button_clicked), (gpointer) window1);
>
>
> The callbacks.c file has the following code, any help on figuring how how
> to fix this will be greatly appreciated. :
>
> void
> button_clicked (GtkButton *synchioButton,
> GtkWindow *window1)
> {
> //GtkWidget *dialog, *label, *image, *hbox;
> GtkWidget *plotbox;
> GtkWidget *gtk_databox_new (void);
> GtkDataboxGraph *graph;
>
> GdkColor color;
> gfloat *X, *Y;
> gint i;
>
> g_print("SynchioButton I was clicked!\n");
>
> X = g_new0 (gfloat, POINTS); // WILL PROBABLY HAVE TO GET RID OF THIS
> Y = g_new0 (gfloat, POINTS);
> for (i = 1 ; i < POINTS + 1; i ++) { X [i] = i; Y [i] = log10 (i); }
>
> color.red = 15535;
> color.green = 15535;
> color.blue = 15535;
>
> graph = gtk_databox_lines_new (POINTS, X, Y, &color, 1);
> gtk_databox_graph_add (GTK_DATABOX (plotbox), graph);
> gtk_databox_auto_rescale (GTK_DATABOX (plotbox), 0.05);
> gtk_widget_show (plotbox);
> }
>
>
>
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>
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