+ struct caseproto *proto = caseproto_create();
+ for (int i = 0; i < dict_get_var_cnt (ia->dict); i++)
+ {
+ const struct variable *var = dict_get_var (ia->dict, i);
+ int width = var_get_width (var);
+ proto = caseproto_add_width (proto, width);
+ }
+
+ gint n_rows = gtk_tree_model_iter_n_children (GTK_TREE_MODEL (ia->delimiters_model), NULL);
+
+ PsppireDataStore *store = NULL;
+ g_object_get (ia->data_sheet, "data-model", &store, NULL);
+
+ struct casereader *cr = casereader_create_random (proto, n_rows,
+ &my_casereader_class, ia);
+ psppire_data_store_set_reader (store, cr);
+ dict_unref (ia->casereader_dict);
+ ia->casereader_dict = dict_clone (ia->dict);
+}
+
+/* Called just before the formats page of the assistant is
+ displayed. */
+static void
+prepare_formats_page (PsppireImportAssistant *ia)
+{
+ my_casereader_class.read = my_read;
+ my_casereader_class.destroy = my_destroy;
+ my_casereader_class.advance = my_advance;