C使用glade的GTK3程序不显示主窗口

Question

我创建了一个带有空地的UI。

当我运行该程序时，它没有提供任何错误，但它也没有显示主窗口。它只是退出。

我的完整的UI文件是在https://paste.gnome.org/pfxz888er 完整的C程序为https://paste.gnome.org/p7rxhhbk2

请告诉我，如果有什么错我的代码。主要部分是：

#include <gtk/gtk.h> 
#include <glib.h> 
#include <glib/gprintf.h> 

static void create (GtkApplication *app, gpointer user_data) 
{ 
GtkBuilder *main_interface; 
main_interface = gtk_builder_new_from_file ("/home/aj/learning/front.glade"); 

// gtk_builder_connect_signals (main_interface,NULL); 
gtk_builder_add_callback_symbol (main_interface, 
          "cb_about", 
          G_CALLBACK(cb_about)); 

gtk_builder_add_callback_symbol (main_interface, 
          "cb_enc_mode", 
          G_CALLBACK(cb_enc_mode)); 
..... all other callbacks........ 

GObject *top_window; 
top_window = gtk_builder_get_object (main_interface, 
        "top_window"); 
gtk_widget_show_all (GTK_WIDGET(top_window)); 
} 

int main (int argc, char *argv[]) 
{ 
int status; 
GtkApplication *app; 
app = gtk_application_new ("org.aj.gui",G_APPLICATION_FLAGS_NONE); 
g_signal_connect(app,"activate",G_CALLBACK(create),NULL); 
status = g_application_run (G_APPLICATION(app),argc,argv); 
g_object_unref (app); 
return status; 
} 

Answer 1

发现此问题。我应该为GtkApplication设置窗口。需要附加代码：

GtkWidget *top_window; 
top_window = GTK_WIDGET (gtk_builder_get_object (main_interface,"top_window")); 
if (!top_window) { 
    g_critical ("Widget \"%s\" is missing in UI file\n", 
      "top_window"); 
} 
g_object_unref (main_interface); 
gtk_window_set_application (GTK_WINDOW (top_window), GTK_APPLICATION (app)); 
gtk_widget_show_all (GTK_WIDGET(top_window));