[Boost-users] boost::asio::streambuf question

Subject: [Boost-users] boost::asio::streambuf question
From: Amit Sonawane (asonawane_at_[hidden])
Date: 2008-10-13 16:33:44

Hi,

 

I am using Asio in Boost version  1.36.0 and I have a question regarding
boost::asio::streambuf. 

 

Code extract:

Class A

{

boost::asio::streambuf buf;//class member 

 

void Read()

{

boost::asio::async_read_until(socket, buf,
boost::regex("\0101"),boost::bind(DoSomething,this,boost::asio::placehol
ders::error,boost::asio::placeholders::bytes_transfered));//class
function

}

 

void DoSomething(const boost::system::error_code& ec, std::size_t
bytes_transferred)//class function

{

If(!ec && (bytes_transferred != 0))

{

boost::asio::streambuf::const_buffers_type bufs = buf.data();

std::string
s(boost::asio::buffers_begin(bufs),boost::asio::buffers_begin(bufs) +
bytes_transferred);

//Do something with the data in s;

 

//Here I need to call async_read_until again, but buf still has the data
read in the earlier call so,  it calls the DoSomething handler again
thus repeating //the process. 

Read();

}              

}

};

 

My question is how do I clear the contents of buf before calling
async_read_until again. I tried reading into a local variable but
boost::asio::streambuf is noncopyable. Is there a better way to do what
I am trying to do. Any help is greatly appreciated.

 

 

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