从golang中的缓冲读取器读取特定数量的字节 [英] Reading specific number of bytes from a buffered reader in golang

问题描述

我知道 bufio 包中的golang中的特定功能。

I am aware of the specific function in golang from the bufio package.

func (b *Reader) Peek(n int) ([]byte, error)

Peek返回下n个字节，不提高阅读器。字节
在下一次读取调用时停止有效。如果Peek返回的字节数少于n
个字节，则它还会返回一个错误，解释为什么读取短。如果n大于b的缓冲区大小，则
错误为ErrBufferFull。

Peek returns the next n bytes without advancing the reader. The bytes stop being valid at the next read call. If Peek returns fewer than n bytes, it also returns an error explaining why the read is short. The error is ErrBufferFull if n is larger than b's buffer size.

我需要能够读取特定数字读取器读取的字节数，将使读取器前进。基本上，与上面的功能相同，但是它使阅读器更高级。有人知道如何做到这一点吗？

I need to be able to read a specific number of bytes from a Reader that will advance the reader. Basically, identical to the function above, but it advances the reader. Does anybody know how to accomplish this?

推荐答案

请注意， bufio.Read 方法最多调用一次底层 io.Read ，这意味着它可以返回 n< len（p），但没有达到EOF。如果您想精确地读取 len（p）个字节或由于错误而失败，则可以使用 io.ReadFull

Note that the bufio.Read method calls the underlying io.Read at most once, meaning that it can return n < len(p), without reaching EOF. If you want to read exactly len(p) bytes or fail with an error, you can use io.ReadFull like this:

n, err := io.ReadFull(reader, p)

即使读取器处于缓冲状态，此方法也有效。

This works even if the reader is buffered.

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