我有这个代码：
/* Descrizione: GUI Client FTP sviluppato come progetto per il corso di Reti di Calcolatori (laurea SSRI presso DTI Crema)
* Sviluppatori: Paolo Stivanin, Filippo Roncari, Stefano Agostini.
* Anno: 2012
* Licenza: GNU AGPL v3 <http://www.gnu.org/licenses/agpl-3.0.html>
* Sito web: <https://github.com/polslinux/FTPUtils> */
#include <gtk/gtk.h>
/* When "connect" button is clicked a message will appear */
static void print_hello (GtkWidget *widget, gpointer data)
{
g_print ("Connect button clicked\n");
}
int main (int argc, char *argv[]){
/* Declare widgets */
GtkWidget *window;
GtkWidget *grid;
GtkWidget *button;
GtkWidget *u_name;
GtkWidget *h_name;
GtkWidget *pass;
GtkWidget *label_user;
GtkWidget *label_host;
GtkWidget *label_pass;
/*This is called in all GTK applications. Arguments are parsed from the command line and are returned to the application.*/
gtk_init (&argc, &argv);
/* create a new window, set its title and put it on center */
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "FTP Client");
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
gtk_window_set_resizable(GTK_WINDOW(window), FALSE); /* window is NOT resizable */
/* Here we construct the container that is going pack our buttons */
grid = gtk_grid_new ();
gtk_grid_set_row_spacing (GTK_GRID (grid), 3);
/* Pack the container in the window */
gtk_container_add (GTK_CONTAINER (window), grid);
/* Add labels */
label_user = gtk_label_new("Username ");
label_host = gtk_label_new("Hostname ");
label_pass = gtk_label_new("Password ");
/* Add hostname entry and label */
h_name = gtk_entry_new();
gtk_entry_set_placeholder_text (GTK_ENTRY (h_name), "Hostname"); /* imposto il testo trasparente che scompare quando clicco o scrivo */
gtk_grid_attach (GTK_GRID (grid), label_host, 0, 0, 1, 1);
gtk_grid_attach (GTK_GRID (grid), h_name, 1, 0, 1, 1);
/* Add username entry and label */
u_name = gtk_entry_new();
gtk_entry_set_placeholder_text (GTK_ENTRY (u_name), "Username");
gtk_grid_attach (GTK_GRID (grid), label_user, 0, 1, 1, 1);
gtk_grid_attach (GTK_GRID (grid), u_name, 1, 1, 2, 1);
/* Add password entry and label (visibility set to 0 = not visible */
pass = gtk_entry_new();
gtk_entry_set_placeholder_text (GTK_ENTRY (pass), "Password");
gtk_grid_attach (GTK_GRID (grid), label_pass, 0, 2, 1, 1);
gtk_entry_set_visibility (GTK_ENTRY (pass), 0);
gtk_grid_attach (GTK_GRID (grid), pass, 1, 2, 1, 1);
/* Add connect button */
button = gtk_button_new_with_label ("Connect");
g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
gtk_grid_attach (GTK_GRID (grid), button, 0, 3, 2, 1);
/* Add quit button */
button = gtk_button_new_with_label ("Quit");
g_signal_connect (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);
gtk_grid_attach (GTK_GRID (grid), button, 0, 4, 2, 1);
/* Now that we are done packing our widgets, we show them all in one go, by calling gtk_widget_show_all() on the window.*/
gtk_widget_show_all (window);
/* All GTK applications must have a gtk_main(). Control ends here and waits for an event to occur (like a key press or a mouse event),
* until gtk_main_quit() is called. */
gtk_main ();
return 0;
}
我想添加更多小部件......我该怎么做？例如我想添加一个菜单栏（例如关于菜单），但如果我这样做：
gtk_container_add (GTK_CONTAINER (window), menubar);
编译器告诉我，我不能在窗口中添加超过 1 个小部件......
我正在 Ubuntu 12.04 上使用 GTK+ v3.4.1 开发 gui！