程式語言 - GTK - v3.0 - Hello, world!

參考資訊：
https://docs.gtk.org/gtk3/getting_started.html

main.cpp

#include <gtk/gtk.h>

static void activate(GtkApplication *app, gpointer user_data)
{
    GtkWidget *win = NULL;

    win = gtk_application_window_new(app);
    gtk_window_set_title(GTK_WINDOW(win), "Hello, world!");
    gtk_widget_show_all(win);
}

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

    app = gtk_application_new(NULL, G_APPLICATION_DEFAULT_FLAGS);
    g_signal_connect(app, "activate", G_CALLBACK(activate), NULL);
    g_application_run(G_APPLICATION(app), argc, argv);
    g_object_unref(app);

    return 0;
}

編譯、執行

$ gcc $(pkg-config --cflags gtk+-3.0) -o main main.c $(pkg-config --libs gtk+-3.0)
$ ./main