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POWhat's the meaning of boost::asio::placeholders::bytes_transferred
 

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  1. POWhat's the meaning of boost::asio::placeholders::bytes_transferred
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    <p>What is the meaning of <code>boost::asio::placeholders::bytes_transferred</code> in <code>async_read_until()</code>? In the callback function it returns smaller value, than <code>streambuf.size()</code>. <code>streambuf</code> was clear before the callback. To sum up,...<code>bytes_transferred</code> is not the actual number of bytes went through the socket, but less. Do I have misunderstood all of this, or what?</p> <p><strong>EDIT:</strong> I read the following protocol from a socket:</p> <blockquote> <p><code>Y43,72,0,,91009802000000603=0000000000000000000</code></p> </blockquote> <p><code>"Y43,"</code> - is the header.<br> <code>"Y"</code> - is message type.<br> <code>"43"</code> - additional bytes to read<br> <code>","</code> - delimiter. The header is the until the first "," encountered.</p> <p>My code is for reading is like:</p> <pre><code>void handle_write(const boost::system::error_code&amp; error, size_t bytes_transferred) { if (!error) { boost::asio::async_read_until( socket_, inputStreamBuffer_, ',', boost::bind( &amp;client::handle_read1, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred ) ); } else { std::cout &lt;&lt; "Write failed: " &lt;&lt; error &lt;&lt; "\n"; } } void handle_read1(const boost::system::error_code&amp; error, size_t bytes_transferred) { cout &lt;&lt; "bytes_transferred=" &lt;&lt; bytes_transferred &lt;&lt; endl; if (!error) { cout &lt;&lt; "0 size=" &lt;&lt; inputStreamBuffer_.size() &lt;&lt; endl; istream is(&amp;inputStreamBuffer_); char c[1000]; is.read(c,bytes_transferred); c[bytes_transferred]=0; for (int i=0;i&lt;bytes_transferred;++i) { cout &lt;&lt; dec &lt;&lt; "c[" &lt;&lt; i &lt;&lt; "]=" &lt;&lt; c[i] &lt;&lt; " hex=" &lt;&lt; hex &lt;&lt; static_cast&lt;int&gt;(c[i]) &lt;&lt; "#" &lt;&lt; endl; } } else { std::cout &lt;&lt; "Read failed: " &lt;&lt; error &lt;&lt; "\n"; } } </code></pre> <p>For stream sent from the other side:</p> <blockquote> <p><code>Y43,71,0,,91009802000000595=0000000000000000000</code></p> </blockquote> <p>Some times, I read this:</p> <blockquote> <p><code>bytes_transferred=4</code><br> <code>0 size=47</code><br> <code>c[0]=Y hex=59#</code><br> <code>c[1]=4 hex=34#</code><br> <code>c[2]=3 hex=33#</code><br> <code>c[3]=, hex=2c#</code></p> </blockquote> <p>For stream sent from the other side:</p> <blockquote> <p><code>Y43,72,0,,91009802000000603=0000000000000000000</code></p> </blockquote> <p>But other times, I read this:</p> <blockquote> <p><code>bytes_transferred=7</code><br> <code>0 size=47</code><br> <code>c[0]= hex=0#</code><br> <code>c[1]= hex=0#</code><br> <code>c[2]= hex=0#</code><br> <code>c[3]= hex=0#</code><br> <code>c[4]=7 hex=37#</code><br> <code>c[5]=2 hex=32#</code><br> <code>c[6]=, hex=2c#</code></p> </blockquote> <p>The socket is secured with SSL, and the client and server apps are slightly modified examples from boost_asio/example/ssl/* .</p> <p>In the second example I loose the entire header :(</p>
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