Unless I'm missing something it looks like you are passing zero-length vector to the buffer() function.

From asio docs this call is equivalent to:

mutable_buffers_1( data.size() ? &data[0] : 0, min(data.size() * sizeof(PodType), max_size_in_bytes)); ,where the data.size() = read_buffer_.size() i.e. zero for empty vector. You might try vector::resize(15) or just a size-taking constructor. Cheers, -- Nikolai

Trying to limit number of bytes transferred to at least 15 bytes before async_read call back I have got callbacks with sizes: 0,1,2,3,4 and 5 (so total indeed 15) But I was expecting only single callback with size 15.

How I can fix the issue?

Thanks Vlad.

linux suse 2.6.16 boost 1.39 gcc 4.1.2

//boost asio stripped part.

BufferSize=1000; class test{

vector<char> read_buffer_; boost::asio::ip::tcp::socket socket_; //socket was inited correctly.

test() { read_buffer_.reserve(BufferSize); }

void handle_connect( const boost::system::error_code& err, boost::asio::ip::tcp::resolver::iterator endpoint_iterator ) { if (!err) { boost::asio::async_read(socket_,boost::asio::buffer(read_buffer_, BufferSize), //requested at least 15 bytes!! boost::asio::transfer_at_least(15), boost::bind(&test::handle_read, this, boost::asio::placeholders::error)); } else { cerr<

void handle_read( const boost::system::error_code& err) { if (!err) { //+++++++++++++++++++++++++++ //expecting to get at least 15! //But have not get those. //+++++++++++++++++++++++++++ cerr<<"Got:"<

};

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On Wed, Feb 10, 2010 at 5:19 PM, Sakharuk, Vladimir < vladimir.sakharuk@credit-suisse.com> wrote:

Have questions about using with tcp on linux. Can I send multiple messages to async_write without waiting for write completion callback? If yes, can I do it from more then one thread? Url with info would be handy.

Thanks!

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Hi, I am using boost:asio sync socket to upload file to server. At the end of upload, server send response back which can varying length and format. I need to read this response, considering that I haven't found a way to know how much data is available for reading, my call get blocked on some of the response. I Was wondering if there is a way to know one or more of the following. Is there condition I can pass to the read_until() call so that it read all the available response in one call? Is there a way to know that how much data remaining to be read? Is there a way that my call time out when there is no data? With three different server and response these call behave in following Manner Server1 : First call read all the data, 2nd call fail with error code EOF. Server2 :First call read all the data, 2nd call read some data, some time there are still more data to be read. Server2 :First call read all the data, 2nd call block. size_t size1 = boost::asio::read_until(*m_pSocket, response_, "\r\n", error); //process response, //Read again, size1 = boost::asio::read_until(*m_pSocket, response_, "\r\n\r\n", error); numByte = response_.in_avail(); //process response. Thanks, Akhilesh Kumar

Thanks Igor, This method " tcp::socket::available()" really solved most of my problem, this was the missing link for me after using WinInet for some time where I had convenience of using high level API I was really missing something while using BOOST::ASIO sync socket. This fills that gap. Thanks, Akhilesh Kumar -----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Igor R Sent: Sunday, February 14, 2010 7:49 AM To: boost-users@lists.boost.org Subject: Re: [Boost-users] boost::asio determining end of stream,

I am using boost:asio sync socket to upload file to server. At the end of upload, server send response back which can varying length and format. I need to read this response, considering that I haven't found a way to know how much data is available for reading, my call get blocked on some of the response.

I Was wondering if there is a way to know one or more of the following.

Is there condition I can pass to the read_until() call so that it read all the available response in one call?

No. You can read "all the available response" using tcp::socket::read_some()/async_read_some(), but this would be the data available at time of the read operation - next moment some more data might arrive.

Is there a way to know that how much data remaining to be read?

tcp::socket::available() http://www.boost.org/doc/libs/1_42_0/doc/html/boost_asio/reference/basic_str...

Is there a way that my call time out when there is no data?

You can implement time-out using asynchronous read and asio::deadline_timer, just like in the following example: http://www.boost.org/doc/libs/1_42_0/doc/html/boost_asio/example/timeouts/st... _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users