CODEWITHSUNDEEP
csegmentation-faultgtk3
txk2048
txk2048

Reputation: 321

Segfault in gtk_window_new

I have a simple GTK app written in C that segfaults on the line window = gtk_window_new(GTK_WINDOW_TOPLEVEL)

Here is the code:

#include <gtk/gtk.h>

int main(int argc, char **argv) {
    GtkApplication *app = NULL;
    GtkWidget *window = NULL;
    app = gtk_application_new("com.github.Toothless204", G_APPLICATION_FLAGS_NONE);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

    gtk_application_add_window(app, GTK_WINDOW(window));
    int status = g_application_run(G_APPLICATION(app), argc, argv);

    g_object_unref(app);
    return status;
}

I have googled around to find an answer but didn't find anything that actually provided an answer as to what the problem could be

Upvotes: 0

Views: 1008

Answers (1)

Damian
Damian

Reputation: 261

Problem: tried to create a window before the GTK+ initialization functions was called by the GtkApplication.

Before using GTK+, you need to initialize it. https://developer.gnome.org/gtk3/stable/gtk3-General.html

#include <gtk/gtk.h>

int main(int argc, char **argv) {
    GtkWidget *window = NULL;

    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_widget_show (window);

    g_signal_connect (window, "destroy",
        G_CALLBACK (gtk_main_quit), NULL);

    gtk_main();
    return 0;
}

For the same reason GtkApplication windows must be added after the GApplication 'startup' signal has been emitted. https://wiki.gnome.org/HowDoI/GtkApplication

#include <gtk/gtk.h>

static void activate (GApplication *app, gpointer user_data) {
    GtkWidget *window;

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_application_add_window(GTK_APPLICATION(app), GTK_WINDOW(window));
    gtk_widget_show (window);
}

int main (int argc, char **argv) {
    GtkApplication *app;
    int status;

    app = gtk_application_new ("com.github.Toothless204", G_APPLICATION_FLAGS_NONE);
    g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
    status = g_application_run (G_APPLICATION (app), argc, argv);

    g_object_unref (app);
    return status;
}

Upvotes: 1

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