Re: Text View Complaining about Double Free or Corruption

[James Scott Jr <skoona verizon net>]

Mark,

I'm not sure what in your #include "common.h", but I placed the
following in mine

#include <stdlib.h>  /* for abort() */
#include <gtk/gtk.h> /* for gtk, gdk, and glib */

With that single change the program compiled and executed without error
message; as I would have expected.

James,

On Tue, 2008-02-26 at 01:29 -0500, Mark Rodriguez wrote:

> Was wondering if anybody has any idea(s) why the code below would seem
> to work fine on GTK/X11 (at least I don't see any error messages), but
> fail on GTK/DirectFB? When the application is exited by hitting the
> "Quit" button, I receive the following error message:
>
> *** glibc detected *** TextDemo: double free or corruption (out): 0x4035b1b0 ***
>
> I'm trying to figure out if this is a GTK related problem (i.e., am
> I'm doing something wrong in GTK) or a problem with GTK/DirectFB. I
> have to assume that my code IS the problem, but I just don't see where
> / how. Thanks in advance for any suggestions or help.
>
> [code]
> #include "common.h"
>
> GtkWidget* main_window;
>
> static gboolean destroy_event(GtkWidget* widget, void* data)
> {
>        gtk_main_quit();
>        return FALSE;
> }
>
> static void button_click_event(void)
> {
>        gtk_widget_destroy(main_window);
> }
>
> int main(int argc, char* argv[])
> {
>        GtkWidget *text_view, *box, *button;
>
>        // initialize multi-threading within GLib
>        g_thread_init(NULL);
>
>        // initialize multi-threading within GDK
>        gdk_threads_init();
>
>        // acquire thread lock
>        gdk_threads_enter();
>        gtk_init(&argc, &argv);
>
>        // create main window
>        main_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>        if (main_window == NULL)
>                abort();
>        g_signal_connect(G_OBJECT(main_window), "destroy",
> G_CALLBACK(destroy_event), NULL);
>        gtk_widget_show(main_window);
>
>        box = gtk_vbox_new(FALSE, 5);
>        if (box == NULL)
>                abort();
>        gtk_widget_show(box);
>        gtk_container_add(GTK_CONTAINER(main_window), box);
>
>        text_view = gtk_text_view_new();
>        if (text_view == NULL)
>                abort();
>        gtk_widget_show(text_view);
>        gtk_box_pack_start(GTK_BOX(box), text_view, TRUE, TRUE, 5);
>
>        button = gtk_button_new_with_label("Quit");
>        if (button == NULL)
>                abort();
>        g_signal_connect(G_OBJECT(button), "clicked",
> G_CALLBACK(button_click_event), NULL);
>        gtk_widget_show(button);
>        gtk_box_pack_start(GTK_BOX(box), button, TRUE, TRUE, 5);
>
>        // run the main loop
>        gtk_main();
>
>        // release thread lock
>        gdk_threads_leave();
>
>        return 0;
> }
> [/code]
>
> --
> Mark
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