见此牛人
http://stackoverflow.com/questions/10195343/copy-a-file-in-an-sane-safe-and-efficient-way
特别推荐使用c++的缓冲流 cdbuf()
http://blog.youkuaiyun.com/sszgg2006/article/details/7469539
http://blog.youkuaiyun.com/acaiacc/article/details/5467128
见此牛人
http://stackoverflow.com/questions/10195343/copy-a-file-in-an-sane-safe-and-efficient-way
特别推荐使用c++的缓冲流 cdbuf()
http://blog.youkuaiyun.com/sszgg2006/article/details/7469539
http://blog.youkuaiyun.com/acaiacc/article/details/5467128