On Tue, 2013-12-10 at 06:31 +0100, onetmt wrote:
> Il 01/12/2013 21:01, Alberto Zichittella ha scritto:
> > This message dialog causes a strange behavior on my program. It seems
> > that the call to gtk_message_dialog_new() change the value of the const
> > gchar* pointer, last parameter.
> >
> > Furthermore, the value of the const gchar* variable "message" change
> > from "Il risultato e' -number-" to "Il risult(", I don't know why.
> > I know that the call changes the value (and the address) of message
> > because I use gdb.
> >
> > I develope on ubuntu gnome 13.10 using Code::Blocks , on a 64bit system,
> > with gtk+-3.0
> >
> >
> > const gchar* message;
> > /*the function risolviFormat() create a gchar* pointer, using malloc
> > to allocate memory */
> > message = espressione->risolviFormat(); //message is, for example,
>
> Try this substitution:
>
> gchar *message;
>
> message = g_strdup_printf("Il risultato e': %f", result);
> dialog = gtk_message_dialog_new(NULL,
> GTK_DIALOG_DESTROY_WITH_PARENT,
> GTK_MESSAGE_INFO,
> GTK_BUTTONS_OK,
> (const gchar *)message);
>
You really should not be passing a literal string as a format.
What you really want is:
dialog = gtk_message_dialog_new(NULL,
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_INFO,
GTK_BUTTONS_OK,
"Il risultato e': %f",
result);
> > "Il risultato e' 789"
> > dialog = gtk_message_dialog_new (NULL,
> > GTK_DIALOG_DESTROY_WITH_PARENT,
> > GTK_MESSAGE_INFO,
> > GTK_BUTTONS_OK,
> > message);
> > /*now message is "Il risult("
> > gtk_window_set_position(GTK_WINDOW(dialog),GTK_WIN_POS_CENTER_ALWAYS);
> > gtk_dialog_run (GTK_DIALOG (dialog));
> > gtk_widget_destroy (dialog);
> > /*this call causes a segfault because message pointer changed his
> > value */
> > free(message);
This causes a segfault cause you're freeing glib memory with
libc 'free()'
> > return;
> >
> > --
> >
> >
> > Mio blog: http://newbufferedwriter.blogspot.com/
> > http://prodigious.altervista.org/Scrobblit/index.php
> >
> >
> > _______________________________________________
> > gtk-list mailing list
> > gtk-list@xxxxxxxxx
> > https://mail.gnome.org/mailman/listinfo/gtk-list
> >
>
>
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