boost read_some函数疑惑

Posted 2020-10-10

read_some一旦有遇到数据发送过来，就会立刻返回，但是怎么知道数据是否已经发送结束

目前的情况下，是继续等待接收，直到遇到协商的结束符号.如果read_some返回数据是0，代表对端已经关闭了

void ReadSomeFunc()

{

boost::system::error_code ec;

do

{

char szRecvBuf[10240] = { 0 };

int nReadLen = m_socket.read_some(boost::asio::buffer(szRecvBuf), ec);

if (0 == nReadLen)

{

char szRecvBufLeft[10240] = { 0 };

nReadLen = m_socket.read_some(boost::asio::buffer(szRecvBufLeft), ec);

if (0 == nReadLen) return;

m_strMatch = m_strMatch + szRecvBufLeft;

}

if (ec) return;

m_strMatch = szRecvBuf;

int nIndexOfContentLength = m_strMatch.find("Content-Length:", 0);

int indexOfEnd = m_strMatch.find("\r\n\r\n", 0);

if (nIndexOfContentLength == -1) break;

if (-1 == indexOfEnd) break;

std::string strContextLen = m_strMatch.substr(nIndexOfContentLength + 15, indexOfEnd - nIndexOfContentLength - 15);

unsigned int nContextLen = atoi(strContextLen.c_str());

if (nContextLen > m_strMatch.length())

{

char szRecvBufLeft[40960] = { 0 };

m_socket.read_some(boost::asio::buffer(szRecvBufLeft), ec);

m_strMatch = m_strMatch + szRecvBufLeft;

}

boost::asio::streambuf request;

std::ostream request_stream(&request);

request_stream << "HTTP/1.1 200 OK\r\n";

request_stream << "\r\n";

boost::asio::write(m_socket, request, ec);

} while (0);

}