std::ofstreamo("C:\\Users\\Administrator\\Desktop\\test.tar",std::ofstream::app|std::ofstream::out|std::ofstream::binary);tar::writerwt(o);wt.put_file("a.jpg","C:\\Users\\Administrator\\Desktop\\a.jpg");wt.finish();o.close();如何增加文件夹1下的a.txt文件?C:\\Users\\Administrator\\D