June 2011 - Boost-users - lists.preview.boost.org

"WinSock.h has already been included" : problem with asio and VC++2010
by Claude 06 Jun '11

06 Jun '11

Hi! I use a boost asio library in my program. When I compile with Visual C++ obtain this error: [...]\boost_1_45_0\boost\asio\detail\socket_types.hpp(22): fatal error C1189: #error : WinSock.h has already been included How can I fix this error? -- View this message in context: http://boost.2283326.n4.nabble.com/WinSock-h-has-already-been-included-prob… Sent from the Boost - Users mailing list archive at Nabble.com.

3 3

Boost MSM: Can not get out of the submachine
by gauravk 06 Jun '11

06 Jun '11

Hi, I have been playing around with the boost MSM libraries, to know more about them. I am creating a vending machine simulation with a sub-machine for accepting payment from the user. The vending machine has 3 states: waiting (where the machine just waits for the user to start processing), selection (where user selects a product. The machine makes a transition to this state from "waiting" state if the event "key_press" occurs and if the key pressed is the start button (checked by a guard condition).). After a product is selected the machine goes in payment state, which is a submachine that accepts payment in quarters. After the payment is received (it is fixed $1 for all products, just to make it simple) the machine again goes in the waiting state dispensing the product (action: dispatch_item). The submachine Payment has 4 states: Payment_init which just displays a message and then makes an immediate automatic transition to the next state "Paying". In this state the machine just waits for the "coin_insert" event to occur (which represents inserting a quarter). Once the "coin_insert" event occurs it makes a transition to "check_payment" state which checks if sufficient amount was paid. If not it again makes an automatic transition to "Paying" state, else it moves to the "Payment_done" state which is the last state in the submachine. This state generates an event "last_state" which is an indicator that the payment has been made and should cause a transition from the submachine "Payment" to waiting state (which I am not observing). The transition tables for both the machines are: (btw I am using the functors as the front end.) Table for vending machine: // +---------------------+-----------------------+----------------------+---------------------+------- Row < waiting, key_press, selection, none, is_start>, /// If start button pressed, go to selection state Row < waiting, key_press, waiting, none, is_cancel>, // If cancel pressed stay in the waiting state Row < selection, key_press, Payment, none, is_number>, //If a product number pressed go to payment Row < selection, key_press, waiting, none, is_cancel>, // If cancel pressed go to Row < Payment, key_press, waiting, none, is_cancel>, Row < Payment, last_state, waiting, dispatch_item, none> //the last_state event is generated in the // "payment_done" state of the Payment submachine // +---------+-------------+---------+---------------------+----------------------+ Table for Payment machine: // +---------------------+-----------------------+----------------------+---------------------+------- Row < Payment_init, none, Paying, none, none >, // Just make an auto transition after displaying a msg Row < Paying, coin_insert, check_payment, none, none>, Row < check_payment, none, Paying, none, is_not_paid>, //If enough money received Row < check_payment, none, payment_done, none, is_paid> // +---------+-------------+---------+---------------------+----------------------+ The code for payment_done state is: struct payment_done: public msm::front::state { template<class Event, class FSM> void on_entry(Event const &, FSM &fsm) { cout << "---------------" << endl; cout << "Payment_done" << endl; fsm.process_event(last_state()); } }; The events that I gave as an input to the state machine are: Event inputs: //vm = vending machine vm->start(); vm->process_event(key_press(START)); //press start vm->process_event(key_press('5')); // select a product vm->process_event(coin_insert(0.25)); // Make payment in quarters and "50 cents"! vm->process_event(coin_insert(0.25)); vm->process_event(coin_insert(0.5)); I am printing out the event/state/action/guard condition name on entry. Here is the output: Output: Trying out the Boost Meta State Machine --------------- waiting Please press start button --------------- Event key_press Entered key: s // s = start --------------- Guard condition is_cancel --------------- Guard condition is_start --------------- selection Select a product: --------------- Event key_press Entered key: 5 --------------- Guard condition is_cancel --------------- Guard condition is_number entering: Payment // submachine --------------- Payment_Init --------------- Paying template Insert coins: //msg displayed in the state //plz ignore the word "template" in the line --------------- Event coin_insert Inserted $0.25 --------------- check_payment Checking if full payment made in check_payment. --------------- Guard condition is_paid //check if full payment received --------------- Guard condition is_not_paid //check if full payment not received (in which case move to Paying state) --------------- Paying template Insert coins: //msg displayed in the state //plz ignore the word "template" in the line --------------- Event coin_insert Inserted $0.25 --------------- check_payment Checking if full payment made in check_payment. --------------- Guard condition is_paid //check if full payment received --------------- Guard condition is_not_paid //check if full payment not received (in which case move to Paying state) --------------- Paying template Insert coins: //msg displayed in the state //plz ignore the word "template" in the line --------------- Event coin_insert Inserted $0.5 --------------- check_payment Checking if full payment made in check_payment. --------------- Guard condition is_paid //check if full payment received (which is, in this case. so move the payment_done state) --------------- Payment_done --------------- Event last state //The event occurs but the transition does not As you can see the event "last_state" is occurring in the payment_done state but the transition is not taking place. I can post the entire code is someone is interested but I am just playing around with the libraries so the code (and some logic too) is not sophisticated at all. Still I can post it if someone wants to take a look at it. Thanks! -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-MSM-Can-not-get-out-of-the-submach… Sent from the Boost - Users mailing list archive at Nabble.com.

2 5

Fwd: boost::range : sliced vs copied
by Rafaël Fourquet 06 Jun '11

06 Jun '11

What is the difference between the two boost::adaptors functions sliced and copied? Looking at the code, one can see that copied uses sliced, but I am not sure if there is a subtle difference. Maybe it could be explained in the docs. Moreover, the docs say that sliced returns "make_range(rng, n, m)", but I could not find the documentation for make_range (and only found a function with this name in the range_detail namespace, but which does not correspond). Thanks!

1 0

ICL library usage for interval map
by Dave Schwartz 06 Jun '11

06 Jun '11

Hi Users, I am trying to use the new ICL (interval container library) for a project that requires some interval based calculations. I have a question on using the joining interval_map. For example, below I have a conceptual 30 minute window divided into three 10 minute intervals. I want to do some aggregates in my 10 minute windows. { [0,10], (10, 20], (20, 30) } Now say, I have 2 clients shopping in the first interval (0, 10) and their shopping time window interval is [2, 5] and [4, 9] minutes respectively. When I add the 2 interval, value pairs to my interval_map, I see that the interval map gets splited from [0, 10] to { [0,2], [2, 4], [5,9], [9,10] }. How do I make sure the interval still remains from [0, 10]. My question is how do I make sure my original interval of 10 minutes is preserved. The samples mentioned do mention about joining interval_map but I cannot seem to figure out an example for my requirement. Thank you for your help Dece

3 3

asio ip::tcp::socket::read(), always returns end of file
by Lloyd 06 Jun '11

06 Jun '11

Hi, I have an asio::ip::tcp::socket. Whenever I try to read from it, it throws an exception "end of file". But it is possible to write to the socket at any time! This is a client side application, it connects to the server using asio::async_connect(). The server is sending back the data, I checked it with wireshark. I tried using the both async_read() and read(), in both cases it fails with the same error. But both async_write(), and write() works perfectly. What could be the reason? This is how the read call implemented ... .... boost::asio::streambuf b; boost::asio::read(sock,b); //This line causes exception ... Thanks, Lloyd

3 6

Re-Introduction
by John M. Dlugosz 06 Jun '11

06 Jun '11

I'm not a stranger to this list, but I am subscribing from a new address. I was subscribed at my previous employer, and participating on these lists last year. I want to say "hi" again, get my email set up, and get past the moderated new-subscriber stage. I'll be musing on Ranges and other topics shortly. —John (John Długosz)

1 0

boost::asio asynchronous read problem
by Sebastian Götte 05 Jun '11

05 Jun '11

Hello, I have a problem when asynchronously reading from a serial port via boost::asio. The application should exchange a few commands and status bytes with the device, then the device starts sending data and the application listens and parses this data. A diagram of the initialization procedure is attached to this mail. I implemented this process using the Qt framework, and it works (data is being displayed as expected). Now I re-implemented the same procedure as a gnuradio module using boost::asio (i.e. a shared library with a nice python wrapper) -- and the initialization seems to work, but I did not succeed in reading anything after that. The constructor of the gnuradio module is being called on startup and does the initialization. After that, the "work" method is called in an infinite loop and should read and parse the data, and since this module is a source module I think it is ok that this call is blocking. The data that should come from the serial port after Initialization looks like this (shown is one "burst", this is sent 125 times a second): [\FX\FX\FX\FX\ X\FX\FX\FX\FX\ X\FX\FX\FX\FX\ X\FX\FX\FX\FX] Where F is a hexadecimal digit, [, ] and \ are the respective ascii characters, and X is any value of no interest (but should be 0x00). From this "line" (not delimited by \n, but by [ and ]) the four hex digit groups shall be extracted: FFFF FFFF FFFF FFFF ...and then be converted to four signed words (It does not need to be fast, and this format was pretty debugging-friendly). My problem is that after the device has been initialized successfully (all init methods have been executed) the read handler registered when async_read is called in work is never executed (I verified async_read is being called). The output of a test run (loading the module, thereby initializing it, then calling work(...) repeatedly) looks like this: -01--rt--02-bar-wh--03--04--01--wh--05--06--wh--07-foo-08--wh-gr_block_executor: source <gr_block openmind_buspirate_source_s (2)> produced no output. We're marking it DONE. I would expect this output followed by an output similar to the first line described above ([\FX\FX...). I use an aptosid linux, kernel 2.6.39-0 i686 and my gcc's answer to --version is gcc (Debian 4.6.0-10) 4.6.1 20110526 (prerelease) My libtool's version is 2.4 and my gnuradio version 3.3.0. I use boost 1.46. My autoconf version is 2.68, my automake version 1.11.1, my make version 3.81. Since this is a lot of code I do not include it here. The code of the important part of the working Qt-based app may be found here: https://github.com/jaseg/openmind-viewer/blob/09db5ba834d8d2c49cb239b1933f2… https://github.com/jaseg/openmind-viewer/blob/09db5ba834d8d2c49cb239b1933f2… Whereas the boost::asio-based code is available here: https://github.com/jaseg/openmind-viewer/blob/02fac3937fe625c85f0d05813ad9d… https://github.com/jaseg/openmind-viewer/blob/02fac3937fe625c85f0d05813ad9d… I would be glad about any suggestions. Sebastian

1 0

[Interprocess 1.46.1] IsolationAwareLoadLibraryA not found by linker
by Remi 04 Jun '11

04 Jun '11

I added some shared memory headers from boost::interprocess to my project and I got the linker error: error LNK2028: unresolved token (0A001325) "extern "C" void * __stdcall IsolationAwareLoadLibraryA(char const *)" (?IsolationAwareLoadLibraryA@ @$$J14YGPAXPBD@Z) referenced in function "void * __cdecl boost::interprocess::winapi::load_library(char const *)" (?load_library@winapi@interprocess@boost@@$$FYAPAXPBD@Z) I'm using Visual C++ 2008 Express compiler (from 2010 IDE) and Windows SDK 6.0A. kernel32.lib is added in linker settings. What's the fix?

1 1

[Boost][spirit] Confused about spaces!
by Germán Diago 03 Jun '11

03 Jun '11

Hello. I'm trying to implement a very basic parser but I'm stuck at the beginning of it. The parser will be fed with input from a very basic minilanguage to execute tests. I want that the first line begins literally like this: begin TestActions But with my current implementation I can't: template <class FwdIterator> struct TestFileParser : qi::grammar<FwdIterator, Test (), qi::ascii::space_type> { TestFileParser() : TestFileParser::base_type(start_) { using namespace boost::spirit::qi; start_ = lit("begin") >> lit("TestActions"); } qi::rule<FwdIterator, Test (), qi::ascii::space_type> start_; }; Because this implementation matches "beginTestActions" as well. And I want them to be different words. If I put a space between them, my rule complains because its attribute must be a Test(). And if I put in the middel a ' ' it doesn't work anymore. What's wrong with spaces? I'm using phrase_parse with qi::ascii::space skipper. Thanks in advance.

2 1

[test] CLOSE and CLOSE_FRACTION tolerance
by Edward Diener 03 Jun '11

03 Jun '11

I am trying to understand the tolerance value passed as the last parameter to the BOOST_XXX_CLOSE and BOOST_XXX_CLOSE_FRACTION macros. The doc says that for the former the value is percentage units while for the latter it is the fraction of absolute values being compared. But in each case there are two values, not just one. Which of the two values are used to determine the tolerance amount in each case ? If both values are being used in each case, how is the tolerance amount computed from the tolerance value passed ?

2 4