使用Boost.Asio读取所需的字节数

Question

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.

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!

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.

Here is my class.

Answer 1

The read function seems to provide exactly what you need:

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. 

Example usage:

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