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我不明白为什么boost :: asio :: read_until读取分隔符后面的字符

[英]I don't understand why boost::asio::read_until reads characters behind the delimiter

原文 2017-07-28 14:50:24 9 1 c++/ boost/ tcp

According to the boost::asio::read_until documentation: 根据boost::asio::read_until文档：

After a successful read_until operation, the streambuf may contain additional data beyond the delimiter. 成功完成read_until操作后，streambuf可能包含定界符之外的其他数据。 An application will typically leave that data in the streambuf for a subsequent read_until operation to examine. 应用程序通常会将这些数据保留在streambuf中，以供后续的read_until操作进行检查。

I do not understand why this happens. 我不明白为什么会这样。

Is it because, in the TCP protocol, if you do not read all the available characters, you can lose them? 是因为在TCP协议中，如果您不阅读所有可用字符，会丢失它们吗？

1 个解决方案

Because if it read only until the character you want, it would have to perform one one-character read at a time. 因为如果只读取直到需要的字符，则必须一次读取一个字符。 This would be horribly inefficient. 这将是非常低效的。

boost：read_until“\\ n”读到“” - boost: read_until “\n” reads until “ ”

Boost :: Asio-读还是read_until？ - Boost::Asio - read or read_until?

boost：asio：read_until与boost :: bind有关的问题 - boost:asio:read_until issue with boost::bind

Boost asio read_until 异常文件结束？ - Boost asio read_until exception end of file?

boost::asio::read_until 不接受套接字作为参数 - boost::asio::read_until does not accept a socket as an argument

读取直到boost :: asio :: streambuf中的字符串分隔符 - Read until a string delimiter in boost::asio::streambuf

提高套接字read_until的结构 - boost sockets read_until for structs

boost read_until 在空白处停止 - boost read_until stops at white space

boost::asio::async_read_until 不要截断输入消息 - boost::asio::async_read_until Don´t truncate the input message

boost::asio::read 完成条件 boost::asio::transfer_at_least(1) 直到 EOF 才会读取 - boost::asio::read with completion condition boost::asio::transfer_at_least(1) won't read until EOF

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相关问题 boost：read_until“\\ n”读到“” - boost: read_until “\n” reads until “ ” Boost :: Asio-读还是read_until？ - Boost::Asio - read or read_until? boost：asio：read_until与boost :: bind有关的问题 - boost:asio:read_until issue with boost::bind Boost asio read_until 异常文件结束？ - Boost asio read_until exception end of file? boost::asio::read_until 不接受套接字作为参数 - boost::asio::read_until does not accept a socket as an argument 读取直到boost :: asio :: streambuf中的字符串分隔符 - Read until a string delimiter in boost::asio::streambuf 提高套接字read_until的结构 - boost sockets read_until for structs boost read_until 在空白处停止 - boost read_until stops at white space boost::asio::async_read_until 不要截断输入消息 - boost::asio::async_read_until Don´t truncate the input message boost::asio::read 完成条件 boost::asio::transfer_at_least(1) 直到 EOF 才会读取 - boost::asio::read with completion condition boost::asio::transfer_at_least(1) won't read until EOF

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