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Bundled properties with boyer_myrvold_planarity_test
by Nick Wiggill 13 Dec '09

13 Dec '09

Can't seem to get this working. I'm not sure if there was something I missed in the docs, but as soon as I use bundled properties boyer_myrvold_planarity_test falls over. void SomeClass::create() { typedef adjacency_list<listS, listS, undirectedS, property <vertex_index_t, int>, property <edge_index_t, int> > Graph; typedef graph_traits<Graph>::vertex_descriptor Vertex; typedef graph_traits<Graph>::edge_descriptor Edge; typedef graph_traits<Graph>::vertex_iterator VertexIterator; BOOST_CONCEPT_ASSERT ((boost::concepts::VertexAndEdgeListGraph<Graph>)); BOOST_CONCEPT_ASSERT ((boost::concepts::IncidenceGraph<Graph>)); //Create graph const int NUM_VERTICES = 5; Graph graph(NUM_VERTICES); //Create vertices and edges Vertex u, v; u = vertex(0, graph); v = vertex(4, graph); //add_edge(u, v, graph); //BAD line! //Other attempted/failed way of adding edges //Edge e; //e = edge(u, v, graph); //Another attempt, doesn't seem to work with //bundled props, unsurprisingly. //add_edge(0, 4, graph); cout << "Vertex and edge additions complete." << endl; //iterate through vertices VertexIterator vItr, vItrEnd; for (tie(vItr, vItrEnd) = vertices(graph); vItr != vItrEnd; ++vItr) { cout << "#"<< endl; //<< graph[*vItr] << endl; } cout << "Vertex iteration complete." << endl; if (boyer_myrvold_planarity_test(graph)) cout << "Test claims graph is planar" << endl; else cout << "Test claims graph is non-planar" << endl; cout << "Planarity testing complete." << endl; } The line commented "BAD line!" causes an exit on calling boyer_myrvold_planarity_test. With the test commented out, the program will run to its normal completion. What am I failing to grasp? TIA -Nick

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Unable to access graph concepts
by Nick Wiggill 13 Dec '09

13 Dec '09

Hi I'm new to Boost (using 1.41.0) and specifcally the BGL and am having a small problem with accessing graph concepts. My IDE (Eclipse/CDT) and compiler (GCC 3.4.5) are having trouble seeing definitions of graph concepts, although I have included boost/graph/graph_concepts.hpp. When I type the boost namespace specifier, autocomplete can find e.g. EqualityComparable, but it cannot find VertexAndEdgeListGraph (among others... but this the one I need). I can see the basic BCCL concepts from boost/concept_check.hpp just fine, making this all the more confusing. My paths are correct, as for example adjacency_list (residing in the same path) works fine. PS. Try to have mercy on me, I'm not only returning to C++ after a number of years but I'm also in the process of reacquainting myself fully with generic programming (and the STL), something I was never too great at... so a lot of things still meet with a blank stare from me. I've just been learning these things slowly by example and by trial-and-error so far. TIA, -- Nick Wiggill skype: nickwiggill nick.wiggill(a)gmail.com www.handcraftedgames.net -- "He uses statistics as a drunken man uses lamp-posts... for support rather than illumination." -Andrew Lang (1844-1912)

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Asio io_service::work destructor throwing mutex exception
by Florian Turck 13 Dec '09

13 Dec '09

Hi, I am using asio´s io_service::work class to prevent io_service.run() from returning. Unfortunatly on deletion of my object the destructor of io_service::work throws an exception: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >' what(): mutex: Invalid argument Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 libSystem.B.dylib 0x9578c732 __kill + 10 1 libSystem.B.dylib 0x9578c724 kill$UNIX2003 + 32 2 libSystem.B.dylib 0x9581f98d raise + 26 3 libSystem.B.dylib 0x95835a44 abort + 93 4 libstdc++.6.dylib 0x9122afda __gnu_cxx::__verbose_terminate_handler() + 433 5 libstdc++.6.dylib 0x9122917a __cxxabiv1::__terminate(void (*)()) + 10 6 libstdc++.6.dylib 0x9122851d __cxa_call_terminate + 53 7 libstdc++.6.dylib 0x9122909d __gxx_personality_v0 + 911 8 libSystem.B.dylib 0x9579aa9d unwind_phase2 + 205 9 libSystem.B.dylib 0x957b1fd9 _Unwind_Resume + 73 10 com.yourcompany.ReclaimR 0x00026ed3 boost::asio::detail::scoped_lock<boost::asio::detail::posix_mutex>::scoped_lock(boost::asio::detail::posix_mutex&) + 79 (scoped_lock.hpp:37) 11 com.yourcompany.ReclaimR 0x00027dfa boost::asio::detail::task_io_service<boost::asio::detail::kqueue_reactor<false> >::work_finished() + 28 (task_io_service.hpp:171) 12 com.yourcompany.ReclaimR 0x00027e72 boost::asio::io_service::work::~work() + 22 (io_service.ipp:155) The asio related objects are all members of my class: [...] private: io_service ioService; io_service::work ioWork; thread ioThread; tcp::socket controlSocket; tcp::acceptor acceptor; [...] This is how I initialize everything: [...] MyClass() : ioService(), ioWork(ioService), ioThread(bind(&io_service::run, &ioService)), controlSocket(ioService), acceptor(ioService), [...] Finally this is what happens in the destructor: [...] if (connected) disconnect(); ioService.stop(); ioThread.join(); [...] Anyone knows how to deal with this? Regards, Florian

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can't build an official example on eclipse
by loveley 13 Dec '09

13 Dec '09

hello, I have an issue while trying to run boost for the first time. I downloaded boost on my mac snow leopard, with eclipse. I compiled the sources(with bjam, without options), and I added the "include" directory (ie boost_1_41_0/boost)and the "libs" one (ie boost_1_41_0/libs) in eclipse. the example I used is the one provided by the official tutorial : ****************************************************** #define BOOST_TEST_MODULE MyTest #include <boost/test/unit_test.hpp> int add( int i, int j ) { return i+j; } BOOST_AUTO_TEST_CASE( my_test ) { // seven ways to detect and report the same error: BOOST_CHECK( add( 2,2 ) == 4 ); // #1 continues on error BOOST_REQUIRE( add( 2,2 ) == 4 ); // #2 throws on error if( add( 2,2 ) != 4 ) BOOST_ERROR( "Ouch..." ); // #3 continues on error if( add( 2,2 ) != 4 ) BOOST_FAIL( "Ouch..." ); // #4 throws on error if( add( 2,2 ) != 4 ) throw "Ouch..."; // #5 throws on error BOOST_CHECK_MESSAGE( add( 2,2 ) == 4, // #6 continues on error "add(..) result: " << add( 2,2 ) ); BOOST_CHECK_EQUAL( add( 2,2 ), 4 ); // #7 continues on error } ****************************************************** and the error is: http://pastebin.com/m4c85af13 . can you help me? thank you, olivier. ****************************************************** ___________________________________________________________________________ Yahoo! Mail réinvente le mail ! Découvrez le nouveau Yahoo! Mail et son interface révolutionnaire. http://fr.mail.yahoo.com

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[Serialization] Saving non-const values
by Patrick Moran 12 Dec '09

12 Dec '09

Hello all, I noticed in the documentation of Boost.Serialization in 1.41.0 that under the "Rationale" section the link for "Compile time trap when saving a non-const value" still appears at the top of the page, but the section it points to is now missing. Is this just an error in the documentation, or has this restriction been removed in 1.41.0. No such change is mentioned in the release notes, but I read somewhere a while ago that they were considering removing the saving-const restriction. In case it helps, the context I'm using this in is using Boost.Serialization to serialize polymorphic classes and polymorphic containers from Boost.PointerContainer. Thanks, Patrick Moran

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boost port for S60 (Symbian)
by Yuriy Krasnoschek 12 Dec '09

12 Dec '09

Hello. I spent some efforts to make several libraries from boost compile and run on Symbian Series 60 with winscw (Code warrior by Nokia). I can share my work with community and continue porting, just need to know where to start. The problem is I was forced to modify original boost sources (like select_platform.hpp) and libraries files due to compiler / platfom limitations. Libraries that ran on S60 3rd Edition Feature Pack 2 + are: thread, date_time, system, regex, asio (partially) and of cource libraries that don't depend on platfom so much smart_pointers / type_traits / integer / etc. -- Best regards, Yuriy A. Krasnoschek aka D.Rider

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Getting metadata of class
by Alex Vinokur 12 Dec '09

12 Dec '09

Hi, Does Boost contain any features to get metadata of classes? For instance, Let Foo be some class class Foo { int m_var1; long* m_var2] char m_var3[100]; dooble m_var4; }; I would like to get the following info (as vector, file, etc) of its members: {" m_var1", "int", sizeof (m_var1), offset of (m_var1) }, {" m_var2", "long", "Pointer", sizeof (m_var2), sizeof (base-variable, i.e., long), offset of (m_var2 }, {" m_var3, "char", "array", sizeof (m_var3), sizeof (base-variable, i.e., char), offset of (m_var3 }, {" m_var4", "double", sizeof (m_var4), offset of (m_var4) }, That info I would like to get as a result of some feature (function, ...) applied to class Foo, not to each member of Foo. Alex.

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Re: [Boost-users] default mpi implementation
by Vladimir Prus 12 Dec '09

12 Dec '09

Sean Farrow wrote: > Hi: > > Could someone give me a url for the default mpi compiler used with > boost.mpi, I believe this is mpi++ but could be wrong. There's no default compiler -- a few will be probed. Specifically, this is what is probed on Unix: binaries named * mpic++ * mpiCC (supposedly used by MPICH) * mpicxx (supposedly used by OpenMPI and MPICH2) Does this help? - Volodya

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My First Boost Program At Work With Visual Studio
by Dave Schwartz 12 Dec '09

12 Dec '09

Hello Gurus, First, my 2 lines of appreciation to the community. I am new to boost library and I must tell, I have been enjoying myself going through various boost libraries and running sample programs provided. Must say all this has been quite straightforward and given me a headstart and confidence in learning the libraries. I have been trying the samples on my home PC with Visual Studio 2008 with the libraries provided by boostpro 1.4 installation. No issues. Yesterday I tried using the serialization library at work and wanted to serialize a simple class to an XML file and de-serialize it. This example worked on my home PC (visual studio 2008). On my work PC that has visual studio 2005, the compilation went fine but the program ended up generating a library as in InventoryConfig.lib, instead of the regular InventoryConfig.exe. Apparently it looks like the output type of the program changed from .exe to .lib on visual studio 2005 on my work computer. When I remove the serialization code, the output type goes back to .exe I copied the same code back to my home pc and with visual studio 2008 I get the correct result and the output type remains an executable as set initially while creating the project. Can't seem to figure out what project properties are getting changed on VS2005 when I use the library. I am not sure where to look or how to go about fixing this issue. Appreciate your help. Thanks a lot Dece

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condition_variable
by Alessandro Bellina 11 Dec '09

11 Dec '09

Hello, I am using boost condition_variables to block while waiting for an asynchronous response. I am seeing an error that happens at random whenever I am releasing the lock just before calling notify_one. The error goes away if I keep the lock and release after notify_one. Here is the code: class BlockingRequest{ public: // predicate class class ResponseStatus { public: ResponseStatus( bool& received ) : m_received( received ) { } bool operator()() const { return m_received; } private: bool& m_received; }; //blocking request std::string Request( const std::string& request ) { boost::mutex::scoped_lock lock( mutex ); //perform asynchronous request through network or something else, pass RequestHandler as a handler boost::posix_time::milliseconds timeoutDuration( 10000 ); //wait for 10 seconds if( !condition.timed_wait( lock, timeoutDuration, ResponseStatus( received ) ) ) { throw std::exception( "Request timed out" ); } return receivedMessage; } //some other thread calls this function void RequestHandler( const std::string& message, void* caller ) { BlockingRequest* myRequest = reinterpret_cast< BlockingRequest* >( caller ); boost::mutex::scoped_lock lock( myRequest->mutex ); myRequest->receivedMessage = message; myRequest->received = true; /* if this next line in bold is commented out, code works fine... contrary to Boost documentation. http://www.boost.org/doc/libs/1_41_0/doc/html/thread/synchronization.html#t… */ *lock.unlock();* myRequest->condition.notify_one(); } };

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privately inherit enable_shared_from_this?
by Eric J. Holtman 11 Dec '09

11 Dec '09

I have some code that uses enable_shared_from_this. I was publicly deriving, i.e. (and this works) class Request : public boost::enable_shared_from_this<Request> { }; I wanted to change my code around so that I wrapped the shared_from_this function inside the class, so that I could check at runtime whether certain conditions hold, i.e. class Request : private boost::enable_shared_from_this<Request> { public: boost::shared_ptr<Request> get_ptr () { if (conditions_are_good) return shared_from this (); else throw std::logic_error ("Bad get"); }; }; This won't compile (visual studio 2008). 1>Compiling... 1>Request.cpp 1>c:\boost\boost_1_40_0\boost\smart_ptr\enable_shared_from_this.hpp(50) : error C2243: 'type cast' : conversion from 'Request *' to 'boost::enable_shared_from_this<T> *const ' exists, but is inaccessible 1> with 1> [ 1> T=Request 1> ] 1> c:\boost\boost_1_40_0\boost\smart_ptr\enable_shared_from_this.hpp(48) : while compiling class template member function 'boost::shared_ptr<T> boost::enable_shared_from_this<T>::shared_from_this(void)' 1> with 1> [ 1> T=Request 1> ] 1> c:\src\cpp\trunk\request_lib\request.h(48) : see reference to class template instantiation 'boost::enable_shared_from_this<T>' being compiled 1> with 1> [ 1> T=Request 1> ] Can I get this to work?

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[integer]/cstdint.hpp How to use portable literals?
by vicente.botet 11 Dec '09

11 Dec '09

Hi, I need to use boost::intmax_t literals in a portable way. I remember some discussion related to this subject, but I've not found the thread. Could someone point me to these threads, or tell me how I can achieve this. I'm currently using the macro INTMAX_C, but it seems that this macro is not always defined. Thanks, _____________________ Vicente Juan Botet Escribá

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Recognition simple variables, pointers and arrays
by Alex Vinokur 11 Dec '09

11 Dec '09

Hi, Is there any Boost method/class that enables to recognize simple variables, pointers, arrays in C++? Something like: http://groups.google.com/group/alt.sources/browse_thread/thread/8b059c1df87… Alex

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[chrono] New Features + Bug fixes + Updated documentation
by vicente.botet 11 Dec '09

11 Dec '09

Hi, I'm pleased to annonce the new version of the Boost.Chrono library. Even if the library is not yet ready for review I wanted to share it with you. The library can be downloaded from the vault http://www.boostpro.com/vault/index.php?action=downloadfile&filename=chrono… and the documentation is online on the sandbox http://svn.boost.org/svn/boost/sandbox/chrono/libs/chrono/doc/html. For the moment I'm not able to test it on Windows and Mac platforms. Could you check if there are some regressions on Windows or on Mac platforms? Of course, any comments or suggestions are welcome. If there is a volontary review manager that can start inspecting the library s/he is also welcome :). This library is based on the Beman's boostified version of the probe of concept of Howard. Many thanks to Howard the originator of the library and to Beman to start the boostification. Next follows the contents of the library and the updates of the new version Version 0.1.0, April 29, 2009 Beman's boostified version Features: * The C++0x Standard Library's class common_type. * The C++0x Standard Library's compile-time rational arithmetic. * The C++0x Standard Library's time utilities, including: * Class template duration * Class template time_point * Clocks: * system_clock * monotonic_clock * high_resolution_clock * Class template timer, with typedefs: * system_timer * monotonic_timer * high_resolution_timer * Process clocks and timers: * process_clock, capturing real, user-CPU, and system-CPU times. * process_timer, capturing elapsed real, user-CPU, and system-CPU times. * run_timer, convenient reporting of process_timer results. Version 0.2.0, December 8, 2009 + New Features + Bug fixes + Updated documentation Features: * Added ratio construction and assignment from an equivalent ratio (LWG 1281. CopyConstruction and Assignment between ratios having the same normalized form) * Added nested ratio typedef type (LWG 1281. CopyConstruction and Assignment between ratios having the same normalized form) * Added BOOST_CHRONO_HAS_CLOCK_MONOTONIC macro to state if monotonic_clock is provided on a platform. * Added duration operator% (LWG 934. duration is missing operator%) * Complete duration operator* and operator/ Implementation: * Use INTMAC_C to name intmax_t constants instead of LL. * Separate chrono.cpp on # files win/chrono.cpp, mac/chrono.cpp and posix/chrono.cpp to make easier the maintenance on different platforms. * Separate process_clock.cpp on # files win/process_clock.cpp, mac/process_clock.cpp and posix/process_clock.cpp to make easir the maintenace on different platforms. * Added the error_code prototype for monotonic_clock::now for mac/chono.cpp * Fully implement mac/chrono.cpp with error handling. * Take care on POSIX systems when CLOCK_MONOTONIC is not defined. Documentation: * The documentation is written now using quick-book using as base "N2661 - A Foundation to Sleep On". Fixed Bugs * operator/ was ambiguous: Disambiguate duration operator/ * CLOCK_MONOTONIC is not defined with cygwin/gcc 3.4: Disable code when BOOST_CHRONO_HAS_CLOCK_MONOTONIC is not defined. * result of metafunctions ratio_multiply and ratio_divide were not normalized ratios: Use of the nested ratio typedef type on ratio arithmetic operations. * Copy constructor from similar duration masked the defaulted operations: Added duration defaulted implementations Note that the comon_type class should be integrated by Boost.TypeTraits, class ratio will be proposed as a standalone library Boost.Ratio, and the Timer and Process clock part could be proposed as an update of Boost.Timer. Best regards, _____________________ Vicente Juan Botet Escribá

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multi-index/interprocess find key must be allocated in shared memory?
by Jerry Hicks 11 Dec '09

11 Dec '09

Hi, I have a multi_index set working nicely in shared memory but I'm trying to figure out how to search one of my indices without allocating the search key in shared memory. Assuming my index is based on a char_string (basic_string with a segment manager allocator), is there an easy way to perform a find() operation that can use a const char *key? Trying to avoid the rather substantial overhead of instantiating my const char *key as a char_string in shared memory. Any other suggestions how I might organize things to avoid the situation would be welcomed.. Cheers, Jerry Hicks

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[BoostCon 2010] Submission deadline extended
by Hartmut Kaiser 11 Dec '09

11 Dec '09

In 2010 BoostCon celebrates its 4th anniversary in Aspen. You are invited to submit a paper or a session (see the original call for participation here: http://www.boostcon.com/community/wiki/show/Start/) for BoostCon 2010, Aspen on May 10 - May 14th, 2010. Please, see http://www.boostcon.com for more information. Important dates: Proposal submissions Extended to January 3, 2010 Proposals decisions sent January 25, 2010 (tentative program available) Fully scheduled program available February 10, 2010 Session materials due April 15, 2010 Hartmut Kaiser, email: hartmut.kaiser(a)gmail.com (Program Committee Chair) David Abrahams, email: dave(a)boostpro.com (Conference Chair) On behalf of the conference organizers

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Re: [Boost-users] Simple serial port demonstration with boost asio asynchronous I/O
by philipp_muenzel＠web.de 11 Dec '09

11 Dec '09

Hello, in reply to this old posting: http://lists.boost.org/boost-users/2008/10/41140.php I would like to kindly ask the author Jeff Gray if he tested his example on a Mac. On Linux, the example works flawlessly and lets me communicate with both "native" serial port hardware and USB-to-serial converted hardware with FTDI chips, which can be adressed via /dev/ttyUSB. On a Power Mac with OS Tiger, using boost 1.40 and the gcc 4.0 compiler, everytime I start the example I get the following errors: $ ./minicom.app/Contents/MacOS/minicom 57600 /dev/cu.usbserial-4B11 Error: Operation not supported Press Enter to exit Error: Bad file descriptor Press Enter to exit However, I can talk to the serial-via-usb hardware using some native socket functions, so the file descriptor itself can't be the problem. How can I get the minicom example to work on Mac also? Regards, Philipp ___________________________________________________________ Preisknaller: WEB.DE DSL Flatrate für nur 16,99 Euro/mtl.! http://produkte.web.de/go/02/

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Workaround for g++ problem compiling Boost.Asio examples on Ubuntu 8.04.3
by David Featherstone 11 Dec '09

11 Dec '09

I'm running Ubuntu 8.04.3 as a VMware virtual machine hosted by Windows XP on a Lenovo T61 laptop. Synaptic Package Manager [or apt-get] on Ubuntu 8.04.3 offers both the libboost-dev v1.34.1 and the libasio-dev v0.3.8 packages with pre-built libraries. Version 1.34 of Boost does not have an integrated asio library; asio integration appears in v1.35 and later versions of Boost. Source code for the problematic example program can be found here: http://www.boost.org/doc/libs/1_41_0/doc/html/boost_asio/tutorial/tuttimer4… Source listing for Timer.4 The first compile problem occurs at the second #include: #include <boost/asio.hpp> The compiler cannot find this header because asio.hpp was installed under /usr/include rather than under /usr/include/boost. I fixed this issue by creating a soft link to /usr/include/asio.hpp in /usr/include/boost: $ sudo ln -s ../asio.hpp /usr/include/boost/asio.hpp Solving the second compile problem proved more difficult. The second compile problem occurred at the first use of the boost::asio namespace: printer(boost::asio::io_service& io) Changing all occurrences of 'boost::asio' to simply 'asio' solves this problem, but makes tedium of playing with the examples and developing new code that will be compatible with v1.35+ of Boost. Instead, I employed namespace declarations to (artificially) nest the asio namespace within the boost namespace. This artificial nesting is straight-forward - a single line of code: #include <iostream> #include <boost/asio.hpp> #include <boost/bind.hpp> #include <boost/date_time/posix_time/posix_time.hpp> namespace boost { namespace asio { using namespace ::asio; } } class printer { public: printer(boost::asio::io_service& io) o o o Caution: I have not made exhaustive tests of this workaround, but it does compile [g++ 4.2.4] , link, and run on my platform: $ g++ -o timer timer.cpp -lboost_thread $ ./timer 0 1 2 3 4 Final count is 5 You may find more helpful information here, from the developer of the asio library: http://blog.think-async.com/ http://blog.think-async.com -- View this message in context: http://old.nabble.com/Workaround-for-g%2B%2B-problem-compiling-Boost.Asio-e… Sent from the Boost - Users mailing list archive at Nabble.com.

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default mpi implementation
by Sean Farrow 11 Dec '09

11 Dec '09

Hi: Could someone give me a url for the default mpi compiler used with boost.mpi, I believe this is mpi++ but could be wrong. Any help appreciated. Sean.

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Including only the needed boost headers.
by Al Gambardella 11 Dec '09

11 Dec '09

I am currently using the tokenizer library to do some simple log file processing. I am the only person on my team currently using the boost libraries. This code I wrote was originally just a utility for myself so I was able to get away with installing boost "only" on my PC. Now others on the team want to use my utility. Is there a way I can share this code with them without forcing them to install boost on there PCs? I am only using a very very small portion of the boost library so I think it would be overkill to make everyone install boost. Can I create a DLL or library to solve this? If this helps... I am running visual studio 2005. My project is not GUI based. Thanks

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Re: [Boost-users] [ASIO] Wrong usage of streambuf ?
by Imran Fanaswala 11 Dec '09

11 Dec '09

> Date: Tue, 08 Dec 2009 15:03:46 +0100 > From: Axel <axel.boost(a)laposte.net> > To: boost-users(a)lists.boost.org > Subject: [Boost-users] [ASIO] Wrong usage of streambuf ? > Message-ID: <4B1E5CC2.6040103(a)laposte.net> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hello > > I m writing a simple client/server program. On a request the server > answers "ok\r\n". It works well. I have a problem with the client. > Using async functions, I don't manage to handle the response from the > server. Once the server sent the response, I want to read the data, > close the socket, and open a new connection to the server. > > When I don't read the data sent by the server, I manage to close the > socket and repeat the operation (close the socket, and reconnect to the > server). > When I read the data, the program seems to block. > > /* Callback to the async_write function. On any request, the server > sends "ok\r_n" */ > void Client::handle_write(boost::asio::ip::tcp::socket* socket, const > boost::system::error_code& err) > { > if(!err) > { > cout << "Read..." << endl ; > // response_ is a boost::asio::streambuf variable > boost::asio::async_read_until(*socket, response_, "\r\n", > boost::bind(&Client::handle_read, this, socket, > boost::asio::placeholders::error, > boost::asio::placeholders::bytes_transferred)) ; > } > else > { > cout << "Error when writing to host: " << err.message() << "\n" ; > } > } > > void Client::handle_read(boost::asio::ip::tcp::socket* socket, const > boost::system::error_code& err, size_t bytes_transferred) > { > cout << bytes_transferred << " bytes received. " << endl ; > > /* Dont count the 2 bytes long "\r\n" string */ > int message_size = bytes_transferred - 2 ; > > > char * response_char = new char[message_size + 1] ; > response_char[message_size] = '\0' ; > response_stream.read(response_char, message_size) ; > string result(response_char) ; > delete response_char ; > response_.consume(2) ; > > socket->close() ; > delete socket ; > connect() ; > return ; > } > > If I skip the block where I read the response_ into a string, the > program works flawlessly. If I try to read the response from the > streambuf variable, the program is blocked at the next call to > async_read_until() */ > So I guess that I m doing something wrong with the streambuf variable > named "response_", but I dont understand what. Can someone explain me > what is wrong ? > > Thanks in advance. > I am not really sure what response_stream is, but I see what you are trying to do. Consider doing the following instead: void Client::handle_read(boost::asio::ip::tcp::socket* socket, const boost::system::error_code& err, size_t bytes_transferred) { ... //Note: data, will contain the "ok\r\n".. so just do some string manip to get rid of it const char* data=boost::asio::buffer_cast<const char*>(response_.data()); response_.consume(bytes_transferred); //This is the key... ... }

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sending a serialized object using message_queue
by Luciano Afranllie 11 Dec '09

11 Dec '09

Hi, I am trying to send a serialized object using message_queue but I am getting a boost::interprocess_exception::library_error in the sender side. I think the problem is me but after a lot of google I could not find a way to make it work This is the method where I am trying to send the message: int RemoteMgr::sendMsgToPeers(const IPCMsg &msg) { std::cout << "RemoteMgr::sendMsgToPeers()\n"; std::ostringstream archive_stream; boost::archive::text_oarchive archive(archive_stream); archive << msg; std::string outbound_data = archive_stream.str(); std::vector<char> outbound(outbound_data.begin(), outbound_data.end()); std::cout << "outbound_data = [" << outbound_data << "]\n"; std::cout << "size = " << outbound.size() << "\n"; // TODO: Not working yet. How to send a string with serialized data? message_queue mq_master(open_only, "master_queue"); mq_master.send(&outbound, outbound.size(), 0); } Where IPCMsg is class IPCMsg { public: IPCMsg() {} IPCMsg(const std::string &type, const std::string &payload); ~IPCMsg(); std::string getSender() { return m_sender; } std::string getType() { return m_type; } std::string getPayload() { return m_payload; } template<class Archive> void serialize(Archive & ar, const unsigned int /* file_version */) { ar & BOOST_SERIALIZATION_NVP(m_sender) & BOOST_SERIALIZATION_NVP(m_type) & BOOST_SERIALIZATION_NVP(m_payload); } private: std::string m_sender; std::string m_type; std::string m_payload; }; Receiver code is like this: unsigned int priority; std::size_t recvd_size; IPCMsg msg; std::vector<char> inbound_data(100); std::cout << "Waiting for peers" << std::endl; while (!terminate) { if (mq.try_receive(&inbound_data, inbound_data.size(), recvd_size, priority)) { std::cout << "New message received.\n"; std::string archive_data(&inbound_data[0], inbound_data.size()); std::istringstream archive_stream(archive_data); boost::archive::text_iarchive archive(archive_stream); archive >> msg; std::cout << "msg type = " << msg.getType() << "\n"; } } Hope you can help. Thanks! Luciano

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[ASIO] Wrong usage of streambuf ?
by Axel 11 Dec '09

11 Dec '09

Hello I m writing a simple client/server program. On a request the server answers "ok\r\n". It works well. I have a problem with the client. Using async functions, I don't manage to handle the response from the server. Once the server sent the response, I want to read the data, close the socket, and open a new connection to the server. When I don't read the data sent by the server, I manage to close the socket and repeat the operation (close the socket, and reconnect to the server). When I read the data, the program seems to block. /* Callback to the async_write function. On any request, the server sends "ok\r_n" */ void Client::handle_write(boost::asio::ip::tcp::socket* socket, const boost::system::error_code& err) { if(!err) { cout << "Read..." << endl ; // response_ is a boost::asio::streambuf variable boost::asio::async_read_until(*socket, response_, "\r\n", boost::bind(&Client::handle_read, this, socket, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)) ; } else { cout << "Error when writing to host: " << err.message() << "\n" ; } } void Client::handle_read(boost::asio::ip::tcp::socket* socket, const boost::system::error_code& err, size_t bytes_transferred) { cout << bytes_transferred << " bytes received. " << endl ; /* Dont count the 2 bytes long "\r\n" string */ int message_size = bytes_transferred - 2 ; char * response_char = new char[message_size + 1] ; response_char[message_size] = '\0' ; response_stream.read(response_char, message_size) ; string result(response_char) ; delete response_char ; response_.consume(2) ; socket->close() ; delete socket ; connect() ; return ; } If I skip the block where I read the response_ into a string, the program works flawlessly. If I try to read the response from the streambuf variable, the program is blocked at the next call to async_read_until() */ So I guess that I m doing something wrong with the streambuf variable named "response_", but I dont understand what. Can someone explain me what is wrong ? Thanks in advance.

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[LibrariesUnderConstruction] Please update Boost.Coroutines entry
by Nat Goodspeed 11 Dec '09

11 Dec '09

Links: Boost Vault: http://www.boostpro.com/vault/index.php?action=downloadfile&filename=boost-… Last upload: 2009 Dec 01 Thank you!

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ASIO: udp datagrams question
by Jay Sprenkle 10 Dec '09

10 Dec '09

When using asio with an async udp connection can I assume I will always receive a complete datagram or nothing at all? If packets are lost I will get nothing. If I get a data read callback I can assume the entire datagram has been received and assembled (even if it consisted of multiple packets)? Some of the underlying assumptions aren't clear from the documentation. Thanks! -- Cause united breaks guitars http://www.youtube.com/watch?v=5YGc4zOqozo

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