使用Boost.Asio读取所需的字节数 [英] Read only desired amount of bytes using Boost.Asio

问题描述

我只是创建一个非常简单的C ++类，该类为我提供了一些方法，例如 connect()和 read()，而不是公开所有的Boost.Asio套接字调用.

I'm just creating a very simple C++ class that provides me a few methods, like connect() and read(), instead of exposing all the Boost.Asio socket calls.

现在，我正在尝试找出如何创建仅读取所需字节数的方法:

Right now, I'm trying to find out how to create a method that reads only the desired amount of bytes:

SocketClient::read(int bytes, char* data); //reads desired amount of bytes and puts them in data, size of data>bytes!

不幸的是，我在Boost.Asio中没有找到 read_byte 函数.我不想删除已收到但尚未读取的字节.

Unfortunately, I found no read_byte function in Boost.Asio. I do not want to drop bytes that have been received, but not yet read.

这是我的课程.

推荐答案

The read function seems to provide exactly what you need:

此功能用于从内存中读取一定数量的数据字节溪流.呼叫将被阻止，直到满足以下条件之一正确:

This function is used to read a certain number of bytes of data from a stream. The call will block until one of the following conditions is true:

- The supplied buffers are full. That is, the bytes transferred
  is equal to the sum of the buffer sizes.
- An error occurred.

示例用法:

boost::asio::read(stream, boost::asio::buffer(data, size));

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