动态大小的boost :: asio :: buffer

问题描述

我正在像这样从boost::asio::ip::udp::socket中读取内容:

I'm reading from a boost::asio::ip::udp::socket like this:

using boost::asio::ip::udp;

// ...

char recv_buf[128];
udp::endpoint sender_endpoint;
size_t len = socket.receive_from(boost::asio::buffer(recv_buf), sender_endpoint);

现在，这可以正常工作，但是我现在可以接收的最大字符数为127.但是，我遇到了一个问题，因为我需要接受一些长度可能相差很大的数据输入(并且例如，长度不明确，带有前缀标头).一种解决方案是动态扩展缓冲区，例如向量.是否可以创建一个动态扩展的boost::asio::buffer来接受(理论上)无限量的输入并将其存储在容器中?

Now, this works perfectly fine, but the maximum amount of characters that I am able to recieve is now 127. However I am facing a problem because I need to accept some data input of which the length can greatly vary (and is not of well-defined length with prefixed headers, for example). A solution to this would be a dynamically expanding buffer, like a vector. Is it possible to create a dynamically expanding boost::asio::buffer to accept (theoretical) infite amounts of input and store it in a container?

推荐答案

UDP数据报的大小并没有太大变化:它永远不会大于 65535 ，在8字节标头之后留出65,527字节数据的空间.

UDP datagram size does not vary all that greatly: it will never be greater than 65535, leaving room for 65,527 bytes of data after the 8-byte header.

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