C Gtk + 2 Glade3：我怎样才能将SourceBuffer设置为从glade加载的GtkSourceView？

GtkSourceView

GtkSourceBuffer *buffer = GTK_SOURCE_BUFFER(gtk_text_view_get_buffer(GTK_TEXT_VIEW(source_view)));

GtkSourceView

GtkTextView

#include <gtk/gtk.h>
#include <gtksourceview/gtksourceview.h>
#include <gtksourceview/gtksourcebuffer.h>
#include <gtksourceview/gtksourcelanguagemanager.h>

int
main(int argc, char **argv)
{
    gtk_init(&argc, &argv);

    GtkBuilder *builder = gtk_builder_new();
    if(gtk_builder_add_from_file(builder, "sourceview.ui", NULL) == 0)
        g_error("In real code, you would handle an error here");
    gtk_builder_connect_signals(builder, NULL);

    GtkWidget *window = GTK_WIDGET(gtk_builder_get_object(builder, "window"));
    GtkSourceView *sourceview = GTK_SOURCE_VIEW(gtk_builder_get_object(builder, "gtk_sourceview"));

    /* Get the buffer */
    GtkSourceBuffer *sourcebuffer = GTK_SOURCE_BUFFER(gtk_text_view_get_buffer(GTK_TEXT_VIEW(sourceview)));

    /* Do stuff to the buffer, to prove we've really got the GtkSourceBuffer */
    gtk_text_buffer_set_text(GTK_TEXT_BUFFER(sourcebuffer),
        "def hello():ntprint 'This should be highlighted as Python'n", -1);
    GtkSourceLanguageManager *manager = gtk_source_language_manager_get_default();
    GtkSourceLanguage *python = gtk_source_language_manager_get_language(manager, "python");
    gtk_source_buffer_set_language(sourcebuffer, python);

    /* Okay, that should prove it, now run the program */
    gtk_widget_show_all(window);
    gtk_main();

    return 0;
}

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <!-- interface-requires gtksourceview 3.0 -->
  <requires lib="gtk+" version="2.20"/>
  <!-- interface-naming-policy project-wide -->
  <object class="GtkSourceBuffer" id="gtksourcebuffer">
    <property name="max_undo_levels">0</property>
  </object>
  <object class="GtkWindow" id="window">
    <property name="default_width">300</property>
    <property name="default_height">300</property>
    <signal name="destroy" handler="gtk_main_quit" swapped="no"/>
    <child>
      <object class="GtkScrolledWindow" id="scrolledwindow">
        <property name="visible">True</property>
        <property name="can_focus">True</property>
        <property name="hscrollbar_policy">automatic</property>
        <property name="vscrollbar_policy">automatic</property>
        <child>
          <object class="GtkSourceView" id="gtk_sourceview">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="left_margin">2</property>
            <property name="right_margin">2</property>
            <property name="buffer">gtksourcebuffer</property>
            <property name="tab_width">4</property>
            <property name="auto_indent">True</property>
            <property name="indent_on_tab">False</property>
          </object>
        </child>
      </object>
    </child>
  </object>
</interface>