[Boost-users] asio::async_read and buffer handling

From: Axel (axel.azerty_at_[hidden])
Date: 2008-04-03 06:22:30

Hello

I m a new Boost user, (and a little less but still new C++ developper) 
and I d like to find some advices about how to manage network 
communications.

I m writing a daemon and I use boost::asio::async_read_until() to fill a 
boost::asio::streambuf buffer.

Here's the corresponding handler :

void Session::handleRecv(const boost::system::error_code& error, size_t 
size)
{
    if(error.value() == 0 && size > 0)
    {
        size -= separator.size();
       
        istream command_stream(&buffer_);
          char * command_chr = new char[size];
        command_stream.read(command_chr, size);
       
        string command = command_chr;
          cout << "COMMAND " << command << endl;
         
          buffer_.consume(separator.size());

       //doSomethingWithTheCommand(command);
           
        this->start();
    }
}

I have some questions regarding this code.

If I don't consume the full buffer_ , as soon as the this->start() is 
called, the handlerRecv() is called again. Is this a normal behaviour ?

Is there a better way to extract the command from the buffer_ variable ?

Finally how could I use an iterator of buffer_ without using an external 
class (like it's done in 
http://asio.sourceforge.net/boost_asio_1_0_0/libs/asio/doc/html/boost_asio/example/http/server3/request_parser.hpp  
, example I didn't fully understood)

Thanks in advance.