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    <p>You're using the local variable <code>buf</code> as the read buffer, which is dangerous and won't work. Also, you're just sending the original contents of that buffer to the handler. So instead, you need to use a buffer with a longer lifetime. Something like this:</p> <pre><code>class Server { ..... boost::array&lt;char, 1&gt; buf; void Server::accepted() { std::cout &lt;&lt; "Accepted!" &lt;&lt; std::endl; boost::asio::async_read(socket, boost::asio::buffer(buf), boost::bind(&amp;Server::handleRead, this, boost::asio::placeholders::error)); } void Server::handleRead(const boost::system::error_code&amp; error) { if(!error) { std::cout &lt;&lt; "Message: " &lt;&lt; buf.data() &lt;&lt; std::endl; } else { std::cout &lt;&lt; "Error occurred." &lt;&lt; std::endl; } } ..... } </code></pre> <p><strong>edit</strong>: or alternatively, using a heap allocated buffer (not sure if the code is right, but you'll get the idea):</p> <pre><code>void Server::accepted() { std::cout &lt;&lt; "Accepted!" &lt;&lt; std::endl; boost::shared_ptr&lt;boost::array&lt;char, 1&gt;&gt; buf(new boost::array&lt;char, 1&gt;); boost::asio::async_read(socket, boost::asio::buffer(*buf), boost::bind(&amp;Server::handleRead, this, buf, boost::asio::placeholders::error)); } void Server::handleRead(boost::shared_ptr&lt;boost::array&lt;char, 1&gt;&gt; buf, const boost::system::error_code&amp; error) { if(!error) { std::cout &lt;&lt; "Message: " &lt;&lt; buf-&gt;data() &lt;&lt; std::endl; } else { std::cout &lt;&lt; "Error occurred." &lt;&lt; std::endl; } } </code></pre>
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    1. POProblems using boost::asio::async_read()
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    1. CO+1 when using asynchronous methods, it is the caller's responsibility to ensure the buffer is valid throughout the lifetime of the call.
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      1. USSam Miller
    2. COThanks it works, but with a little problem. I configured the client to send "aaaaaa" and the server to read 6 characters. The server is successfully reading the characters but not cleanly: "Message: aaaaaaÌÌÌÌÌÌ(c².ˆ÷0". This is the output I see in the server's console. I've also tried to write buf.data() into a file, but still the same output.
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      1. USMoshe Revah
    3. COThat is because the string isn't null terminated. So you need to use a 7 character buffer, and either have the client send a null terminated string or have the server set the 7th character to null manually. Or you could use std::string as the buffer, just remember to call .resize(6) before you use it.
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