使用Boost.Asio的获得＆QUOT;全包＆QUOT; [英] Using Boost.Asio to get "the whole packet"

问题描述

我有一个TCP客户端连接到我的服务器，发送原始数据包。如何使用Boost.Asio的，我可以得到全数据包每次（异步，当然）？假设这些数据包可以是任意大小达到我的记忆的全尺寸。

I have a TCP client connecting to my server which is sending raw data packets. How, using Boost.Asio, can I get the "whole" packet every time (asynchronously, of course)? Assume these packets can be any size up to the full size of my memory.

基本上，我想避免创建静态大小的缓冲区。

Basically, I want to avoid creating a statically sized buffer.

推荐答案

通常，当你做异步IO，您的协议应该支持。
一个简单的办法是preFIX一个字节数组在逻辑层面它的长度，而且有阅读code缓冲区，直到它有一个完整的缓冲准备解析。

typically, when you do async IO, your protocol should support it. one easy way is to prefix a byte array with it's length at the logical level, and have the reading code buffer up until it has a full buffer ready for parsing.

如果你不这样做，你将最终获得这个逻辑分散各地的地方（想想看空结尾的字符串，这意味着什么，如果你只是得到它的一部分，每次选择/ poll返回）。

if you don't do it, you will end up with this logic scattered all over the place (think about reading a null terminated string, and what it means if you just get a part of it every time select/poll returns).

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