c - GTK+ 2 C - 按下输入或单击按钮以从条目小部件获取文本

Question

当按下回车键或使用一个功能单击按钮时，我应该如何打印条目中的文本？我问是因为当我点击按钮时我得到“(PMAF:3592): Gtk-CRITICAL **: IA__gtk_entry_get_text: assertion 'GTK_IS_ENTRY (entry)' failed (空)”

void print_the_entry(GtkWidget *entry, gpointer user_data)
{
    g_print("%s\n", gtk_entry_get_text(user_data));

}

 //search_entry 
  search_entry = gtk_entry_new();
  g_signal_connect_swapped(G_OBJECT(search_entry), "activate", G_CALLBACK(print_the_entry), (gpointer) search_entry);

  gtk_box_pack_start(GTK_BOX(search_and_do_it_h_box), search_entry, FALSE, FALSE, 0);

  //do_it_button
  do_it_button = gtk_button_new_with_label("Do it!");
  gtk_box_pack_start(GTK_BOX(search_and_do_it_h_box), do_it_button, FALSE, FALSE, 0);
  g_signal_connect_swapped(G_OBJECT(do_it_button), "clicked", G_CALLBACK(print_the_entry), (gpointer) search_entry);

Answer 1

看来你用错了参数，试试:

g_print("%s\n", gtk_entry_get_text(GTK_ENTRY(entry)));