ifstream :: read不追加'\ 0' [英] ifstream::read doesnot append '\0'

问题描述

ifstream :: read 只是将 n 个字节读入缓冲区，但不会在末尾附加'\ 0'缓冲区，对不对?然后，当我使用缓冲区时，如何知道缓冲区的结尾?

ifstream::read just reads n bytes into a buffer, but doesn't append '\0' at the end of the buffer, right? Then when I use the buffer, how does it know the end of the buffer?

是否应该在缓冲区末尾手动添加'\ 0'?

Should I manually append a '\0' at the end of the buffer?

推荐答案

ifstream 用于读取文件，二进制文件或文本.当使用 read 处理二进制文件时，不能确定零字节的起源(来自文件本身还是由 read 附加)，因此read不会附加零.到目标缓冲区.

The ifstream is used for reading from a file, binary or text. When dealing with a binary file with read, one cannot be sure the origin of a zero byte (from the file itself or appended by read) so read does not append a zero to destination buffer.

如果您正在处理文本文件，则可以使用 std :: getline ，并收到 std :: string :

If you are working on a text file, then you can use std::getline, and receive a std::string:

istream& getline ( istream& is, string& str );

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