Question

bool Connection::Receive(){
    boost::shared_ptr<std::string> buffer(new std::string());

    socket_.async_receive(boost::asio::buffer(*buffer), boost::bind(&Connection::handler, this, 
        boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));

    //std::cout<<buffer<<std::endl;

    int recvlen = buffer->length();
    if (recvlen <= 0) {
        return false;
    }
    //this->OnReceived(buffer, recvlen);
    return true;
}

Error:

Error   1   error C2440: '<function-style-cast>' : cannot convert from 'const boost::asio::const_buffers_1' to 'boost::asio::mutable_buffer'    e:\boost_1_46_1\boost_1_46_1\boost\asio\detail\buffer_sequence_adapter.hpp  211

Answer 1

The async_receive function need to change the content of the buffer, but you can’t change a constant buffer.

Use a mutable_buffer instead of a constant buffer. You can find some informations here

You need to pass a pointer and the size to the mutable buffer:

std::vector<char> content_buffer(max_buffer_size);

... boost::asio::mutable_buffer(content.data(), content.size()) ...

It’s important that you declare your content_buffer in a global scope, bacause the async_receive function is accessing the buffer async. If you declare your buffer in the function, it go out of scope before data get received.