template< typename MutableBufferSequence, typename ReadHandler> void async_receive( const MutableBufferSequence & buffers, socket_base::message_flags flags, ReadHandler handler); This function is used to asynchronously receive data from the stream socket. The function call always returns immediately.
Parameters
buffers One or more buffers into which the data will be received. Although the buffers object may be copied as necessary, ownership of the underlying memory blocks is retained by the caller, which must guarantee that they remain valid until the handler is called.
flags Flags specifying how the receive call is to be made.
handler The handler to be called when the receive operation completes. Copies will be made of the handler as required. The function signature of the handler must be:
void handler( const boost::system::error_code& error, // Result of operation. std::size_t bytes_transferred // Number of bytes received. ); Regardless of whether the asynchronous operation completes immediately or not, the handler will not be invoked from within this function. Invocation of the handler will be performed in a manner equivalent to using boost::asio::io_service::post().
Remarks
The receive operation may not receive all of the requested number of bytes. Consider using the async_read function if you need to ensure that the requested amount of data is received before the asynchronous operation completes.
Example
To receive into a single data buffer use the buffer function as follows:
发布评论
评论（1）
看看boost官网上的详细解释：
basic_stream_socket::async_receive
Start an asynchronous receive.
template<
typename MutableBufferSequence,
typename ReadHandler>
void async_receive(
const MutableBufferSequence & buffers,
socket_base::message_flags flags,
ReadHandler handler);
This function is used to asynchronously receive data from the stream socket. The function call always returns immediately.
Parameters
buffers
One or more buffers into which the data will be received. Although the buffers object may be copied as necessary, ownership of the underlying memory blocks is retained by the caller, which must guarantee that they remain valid until the handler is called.
flags
Flags specifying how the receive call is to be made.
handler
The handler to be called when the receive operation completes. Copies will be made of the handler as required. The function signature of the handler must be:
void handler(
const boost::system::error_code& error, // Result of operation.
std::size_t bytes_transferred // Number of bytes received.
);
Regardless of whether the asynchronous operation completes immediately or not, the handler will not be invoked from within this function. Invocation of the handler will be performed in a manner equivalent to using boost::asio::io_service::post().
Remarks
The receive operation may not receive all of the requested number of bytes. Consider using the async_read function if you need to ensure that the requested amount of data is received before the asynchronous operation completes.
Example
To receive into a single data buffer use the buffer function as follows:
socket.async_receive(boost::asio::buffer(data, size), 0, handler);