c - mongoLab C驱动认证及基本示例

Question

我正在尝试Official C driver与之交互mongoLab但遇到错误failed to authenticate credentials。有没有人有任何关于如何mongolab使用C driver. 这是我的示例代码

const char* String_uri = "mongodb://<username>:<pwd>@ds011115.mongolab.com:11115/tempdb";

    uri = mongoc_uri_new(String_uri);
    client = mongoc_client_new_from_uri (uri);


   collection = mongoc_client_get_collection (client, "mydb", "mycoll");
   doc = bson_new_from_json ((const uint8_t *)"{\"hello\" : \"world\"}", -1, &error);

   count = mongoc_collection_count (collection, MONGOC_QUERY_NONE, doc, 0, 0, NULL, &error);

   if (count < 0) {
      fprintf (stderr, "%s\n", error.message);
   } else {
      printf ("%" PRId64 "\n", count);
   }