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Hello World - gtk4
pubsub.movim.eu / devlug • 30 November 2025 • 1 minute
Hier mal ein kleines und einfaches Beispiel in gtk4. Compiliert und läuft.
#include <gtk/gtk.h>
static void click_an(GtkButton *button, gpointer user_data) {
g_assert(button);
gtk_entry_buffer_set_text(gtk_entry_get_buffer(user_data), "an", -1);
}
static void click_aus(GtkButton *button, gpointer user_data) {
g_assert(button);
gtk_entry_buffer_set_text(gtk_entry_get_buffer(user_data), "aus", -1);
}
static void activate(GtkApplication *app, gpointer user_data) {
GtkWidget *window;
window = gtk_application_window_new(app);
gtk_window_set_title(GTK_WINDOW(window), "Demo");
gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
gtk_window_present(GTK_WINDOW(window));
GtkWidget *box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 30);
gtk_box_get_homogeneous(GTK_BOX(box));
GtkWidget *an = gtk_button_new_with_label("An");
GtkWidget *aus = gtk_button_new_with_label("Aus");
GtkWidget *text = gtk_entry_new();
gtk_box_append(GTK_BOX(box), an);
gtk_box_append(GTK_BOX(box), aus);
gtk_box_append(GTK_BOX(box), text);
gtk_window_set_child(GTK_WINDOW(window), box);
g_signal_connect(GTK_BUTTON(an), "clicked", G_CALLBACK(click_an), text);
g_signal_connect(GTK_BUTTON(aus), "clicked", G_CALLBACK(click_aus), text);
}
int main(int argc, char *argv[]) {
GtkApplication *app;
int status;
app = gtk_application_new("de.devlug.sandbox.demo",
G_APPLICATION_DEFAULT_FLAGS);
g_signal_connect(app, "activate", G_CALLBACK(activate), NULL);
status = g_application_run(G_APPLICATION(app), argc, argv);
g_object_unref(app);
return status;
}