自己写的C++文件流的读取，很实用 ，自己写了好久，研究了好久 终于弄明白了，真的很不容易，传上来，供大家学习-Write your own C++ file stream to read, very practical, himself wrote a long time to study for a long time has finally figured out, really is not easy, pass up, for them to learn thank you