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Old 02-12-2005, 10:33 AM   #1
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Registered: Feb 2005
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Gtk-warning **: Cannot Open Display:

have successfully compiled a helloworld program (helloworld.c) by using:
gcc -o helloworld helloworld.c `gtk-config --libs --cflags`

But I don't know why I got the error: "cannot open display: :0.0" when i enter ./helloworld

I try to enter "xhost +" but I get this error message:
"xhost: unable to open display ":0.0"

I am using the Fedora Core release 1 linux and login as root a/c with
gtk:1.2.10 glib:1.2.10.

how I can solve this problem?

This is my helloworld.c file:

#include <gtk/gtk.h>

gint main(gint argc, gchar *argv[])
GtkWidget *window, *widget;

gtk_init(&argc, &argv);

window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "hiGTK+");
gtk_window_set_default_size(GTK_WINDOW(window), 140, 40);

gtk_signal_connect(GTK_OBJECT(window), "destroy",
GTK_SIGNAL_FUNC(gtk_main_quit), NULL);

widget = gtk_button_new_with_label("hello!");
// widget = gtk_label_new("hello");
gtk_container_add(GTK_CONTAINER(window), widget);



return (0);
Old 02-12-2005, 11:06 AM   #2
Registered: Jun 2001
Location: UK
Distribution: Gentoo, RHEL, Fedora, Centos
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you're running it as root aren't you? don't... run it as the user who is logged into the x server. alternaitevly, run "xhost +localhost" to allow any local user to load X displays.
Old 02-18-2005, 12:40 PM   #3
Registered: Feb 2004
Location: Athens, Greece
Distribution: Gentoo,FreeBSD, Debian
Posts: 705

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What does this message mean? I think it can appear in many different occasions. I just installed xchat as root; it works perfect (as root), although i don't use it. When i "su" as a different user this message appears. Does this have to do with the fact, that i am logged in as root and i am trying to run the program as a user? How can i fix this problem? Thanks

Last edited by kpachopoulos; 02-18-2005 at 12:44 PM.
Old 02-18-2005, 11:42 PM   #4
Registered: Mar 2004
Location: Indiana, USA
Distribution: Fedora, CentOS, Ubuntu, OS/X, Raspbian
Posts: 90

Rep: Reputation: 18
is that the only error message ? error: "cannot open display: :0.0"

gtk rarely gives only one. Anyway, the program looks fine -- unless some of those statements are gtk-+2.0.

note: doing everything as root is BAD practice, that's all. Most things work as root.

Is it possible for you to upgrade to FC3? and trythis again. This is the command I had to use to compile your program.

$ gcc -o helloworld helloworld.c `pkg-config gtk+-2.0 --libs --cflags`
Notice the change from 'gtk-config...' to 'pkg-config gtk+-2.0...'

(please answer - is that the only error message)


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