"Ansell, Larry" <Larry_Ansell@xxxxxxxxxx> wrote:
>
> When I connect to a signal
>
> gtk_signal_connect( GTK_OBJECT( button ), "focus-in-event",
> GTK_SIGNAL_FUNC( buttonHandler
> ), argToPass );
>
> In my handler,
>
> void buttonHandler( GtkWidget *widget, gpointer *data ) { }
Other folks have already commented on:
-- use g_signal_connect instead of gtk_signal_connect
-- "clicked" may be a more appropriate event for a button
than "focus-in-event"
My comment is on the handler itself. The prototype for a
focus-in-event handler is:
gboolean handler(GtkWidget *widget, GdkEventFocus *event,
gpointer user_data)
That is, the focus-in-event handler takes 3 arguments (not 2),
the "data" parameter is a gpointer not gpointer *, and returns
a boolean (not void). You can't depend on the C compiler to
catch this signature mismatch. GTK uses a generic callback
signature (void (*GCallback)(void)) and the G_CALLBACK macro
(or in your case GTK_SIGNAL_FUNC) casts the callback to match
GCallback. You must verify that your handler matches the
required signature.
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