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[Serialization] Need help with wide character i/o
by Mahesh Venkitachalam 26 Nov '07

26 Nov '07

Hello, I am looking for some help in following instructions to create a wide character archive that I found from the boost serialization documentation: Actually the reason I am on this path is because my code is crashing if I try to do this in a normal way. (please see my previous post [Serialization] Strange crash with binary_iarchive) > > > To produce wide character text output (i.e. 16 bit characters on Win32 systems), do the following. > > Open a wide character stream. > Alter the stream locale to use boost::archive::codecvt_null<OStream::char_type> > Create the archive with the flag no_codecvt. Naturally, the input process has to be symmetrical. > My attempt (below) crashed when the archive is read back - what am I doing wrong? std::wofstream bofs("gps.bin", std::ios::binary); std::locale loc(bofs.getloc(), new boost::archive::codecvt_null<wchar_t>()); bofs.imbue(loc); // create class instance const gps_position g2(36, 60, 24.567f); boost::archive::binary_woarchive oa(bofs, boost::archive::no_codecvt); oa << g2; bofs.close(); cout << "reading archive..." << endl; gps_position newg; // create and open an archive for input std::wifstream ifs("gps.bin", std::ios::binary); std::locale loc2(ifs.getloc(), new boost::archive::codecvt_null<wchar_t>()); ifs.imbue(loc2); // CRASHES NEXT LINE boost::archive::binary_wiarchive ia(ifs, boost::archive::no_codecvt); // read class state from archive ia >> newg; The serialized class is below: #include <string> #include <vector> #include <fstream> #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_woarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <boost/archive/binary_wiarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/archive/codecvt_null.hpp> using namespace std; class gps_position { private: friend class boost::serialization::access; // When the class Archive corresponds to an output archive, the // & operator is defined similar to <<. Likewise, when the class Archive // is a type of input archive the & operator is defined similar to >>. template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & degrees; ar & minutes; ar & seconds; } int degrees; int minutes; float seconds; double* data; public: gps_position(){}; gps_position(int d, int m, float s) : degrees(d), minutes(m), seconds(s) {} }; Thanks Mahesh

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Re : extract url with boost::regex
by hallouina-ml＠yahoo.fr 26 Nov '07

26 Nov '07

No, I don't see this example, I was reading the documentation and example about regex iterator and not regex token iterator. I search on other website but don't find this example. I will study it. Thanks John for always anwsering, and always fast answering. I was completly discouraged. Thanks again! ----- Message d'origine ---- De : John Maddock <john(a)johnmaddock.co.uk> À : boost-users(a)lists.boost.org Envoyé le : Lundi, 26 Novembre 2007, 17h50mn 31s Objet : Re: [Boost-users] extract url with boost::regex hallouina-ml(a)yahoo.fr wrote: > Hello; > > I try to extract an url from a webpage and it's almostly done but > completly unoptimised : > > Before I try with a regex iterator. But I don't understand the > documentation. :-( Did you see this example:http://www.boost.org/libs/regex/example/snippets/regex_token_iterat… It does exactly what you want - it exacts all the URL's from a HTML file. > boost::regex rexp(".*(http:\\/\\/.+)\"*.*"); > > > and I get this result : > > http://www.nolife-tv.com/" > http://www.nolife-tv.com"> > http://www.nolife-tv.com/images/stories/noiz/1.jpg" > http://www.nolife-tv.com/component/option,com_poll/task,results/id,16/Itemi…';" > http://www.joomla.org" > http://www.google-analytics.com/urchin.js" > http://www.omniture.com > > and so on... > > I will cut and get only the url without the " or ' > why this regex get the " with it? I put the close bracket before the > " so why? I already try to do \\" rather than \" Because the .* on the end of the expression will match whatever text follows the ", the grouping construct (...) spits out a *sub-expression* which you can access via the match_results::operator[] or match_results::str(i) methods. HTH, John. [...] _____________________________________________________________________________ Ne gardez plus qu'une seule adresse mail ! Copiez vos mails vers Yahoo! Mail

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extract url with boost::regex
by hallouina-ml＠yahoo.fr 26 Nov '07

26 Nov '07

Hello; I try to extract an url from a webpage and it's almostly done but completly unoptimised : Before I try with a regex iterator. But I don't understand the documentation. I past to many time on this way, so I try an other way : I get my webpage with libcurl then I replace all " " by a "\n" like that : string::size_type i = 0; while (( i = page_a_analyser.find(' ', i ) ) != (string::npos)) { page_a_analyser.replace(i++, 1, "\n" ); } then I apply the regex : boost::regex rexp(".*(http:\\/\\/.+)\"*.*"); and I get this result : http://www.nolife-tv.com/" http://www.nolife-tv.com"> http://www.nolife-tv.com/images/stories/noiz/1.jpg" http://www.nolife-tv.com/component/option,com_poll/task,results/id,16/Itemi…';" http://www.joomla.org" http://www.google-analytics.com/urchin.js" http://www.omniture.com and so on... I will cut and get only the url without the " or ' why this regex get the " with it? I put the close bracket before the " so why? I already try to do \\" rather than \" I try to do (\"|')" too to say " or ', but this doesn't work too... So I do an other way : I get my webpage with libcurl then I replace all " " by a "\n" then replace all " by \n then replace all ' by \n then I apply the regex And I should replace with 3 while rather than only one... because the 3 conditions in one while wasn't working : while ( (( i = page_a_analyser.find(' ', i ) ) != (string::npos)) or ( i = page_a_analyser.find('"', i ) ) != (string::npos) or ( i = page_a_analyser.find('\'', i ) ) != (string::npos) ) So how can I do to just improve the regex to extract the url? to do just something like : replace " " by "\n" then apply the right regex. I don't want to use a regex iterator again. regex iterator win again my patience... 3 day on it is enough for me. Thanks for your attention _____________________________________________________________________________ Ne gardez plus qu'une seule adresse mail ! Copiez vos mails vers Yahoo! Mail

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Decoding hex strings
by Stefan Arentz 26 Nov '07

26 Nov '07

Is there something in Boost that can help me decode hex strings into binary form? For example hexadecimal strings that contain MD5 hashes. S.

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[boost] [serialization] New Primitive Types
by Andy Tompkins 26 Nov '07

26 Nov '07

Hi, If I create a new class, my_class, am I allowed to mark it as follows: BOOST_CLASS_IMPLEMENTATION ( my_class , boost::serialization::primitive_type ) The comments in level.hpp say that it won't call serialization code, thus I believe (and experience) that I don't need to provide either: template<class Archive> void my_class::serialize(Archive &ar, const unsigned int version) or template<class Archive> void serialize(Archive &ar, my_class &t, const unsigned int version) The comments also say that 'It presumes a member function or template in the archive class that can handle this type.' Does this mean that current archives (text, xml, and binary) are not able to use new primitive types without altering the archive to handle the new primitive? As I try it, both the text and xml archives use stream operators to convert my_class to a string and archive that. The binary archive casts my_class to a void* and outputs sizeof(my_class) bytes to the archive. It this expected behavior? Thanks, Andy.

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Problem in using graphml.cpp..
by abhishek.v＠tcs.com 26 Nov '07

26 Nov '07

Hi I m trying to extract a graph by reading out graphml. For this purpose i'm making using of graphml.cpp and graphml.hpp also i have included "expat" libraries required for this. But when i'm trying to compile this it gives the following error :- Executing make... make.exe -f "C:\Dev-Cpp\graphml\Makefile.win" all g++.exe -D__DEBUG__ -c ../../boost_1_34_1/libs/graph/src/graphml.cpp -o ../../SRLGrp/BoostLib/boost_1_34_1/libs/graph/src/graphml.o -I"C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include" -I"C:/Dev-Cpp/include/c++/3.4.2/backward" -I"C:/Dev-Cpp/include/c++/3.4.2/mingw32" -I"C:/Dev-Cpp/include/c++/3.4.2" -I"C:/Dev-Cpp/include" -I"C:/Dev-Cpp/graphml" -I"C:/SRLGrp/BoostLib/expat-2.0.1/lib" -I"C:/SRLGrp/BoostLib/boost_1_34_1" -I"C:/SRLGrp/BoostLib/expat-2.0.1" -pg -g3 In file included from ../../SRLGrp/BoostLib/boost_1_34_1/libs/graph/src/graphml.cpp:14: C:/SRLGrp/BoostLib/boost_1_34_1/boost\graph\graphml.hpp: In function `void boost::write_graphml(std::ostream&, const Graph&, VertexIndexMap, const boost::dynamic_properties&, bool)': C:/boost_1_34_1/boost\graph\graphml.hpp:259: error: missing terminating " character C:/boost_1_34_1/boost\graph\graphml.hpp:260: error: `xmlns' undeclared (first use this function) C:/boost_1_34_1/boost\graph\graphml.hpp:260: error: (Each undeclared identifier is reported only once for each function it appears in.) C:/boost_1_34_1/boost\graph\graphml.hpp:260: error: expected `;' before ':' token C:/boost_1_34_1/boost\graph\graphml.hpp:260: error: stray '\' in program C:/boost_1_34_1/boost\graph\graphml.hpp:260: error: missing terminating " character C:/boost_1_34_1/boost\graph\graphml.hpp:261: error: stray '\' in program C:/boost_1_34_1/boost\graph\graphml.hpp:261: error: missing terminating " character C:/boost_1_34_1/boost\graph\graphml.hpp:288: error: `value_types' undeclared (first use this function) C:/boost_1_34_1/boost\graph\graphml.hpp:288: error: template argument 1 is invalid C:/boost_1_34_1/boost\graph\graphml.hpp:289: error: template argument 1 is invalid C:/boost_1_34_1/boost\graph\graphml.hpp:289: error: template argument 1 is invalid C:/boost_1_34_1/boost\graph\graphml.hpp:289: error: no matching function for call to `for_each(<type error>)' In file included from ../../boost_1_34_1/libs/graph/src/graphml.cpp:14: C:/boost_1_34_1/boost\graph\graphml.hpp:369:34: warning: no newline at end of file What could be the reason for this. Right now i m only trying to compile the code avaliable on boost website. Thanks Abhishek Vyas ____________________________________________ =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you

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Threads
by Rij 26 Nov '07

26 Nov '07

Hello, I am having problems with running a threads program and was windering if someone could help. I have the following 3 files. 1) example.h class example{ public: example(); virtual ~example(); void operator()(); void someOtherFn(); }; 2) example.cc #include "example.h" C_example::C_example() { } C_example::~C_example() { } void C_example::operator()() { cout << "I'm thread\n"; } 3) main.cc #include <boost/thread/thread.hpp> #include "example.h" int main(int argc, char* argv[]) { example e; boost::thread t1(e); t1.join(); return 0; } I have compiled this and linked with: -lboost_thread-gcc-mt When I run it, I get the following error: terminate called after throwing an instance of 'boost::thread_resource_error' what(): boost::thread_resource_error Abort (core dumped) Any help please?

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[boost-users] assigning pointer of vector.
by chun ping wang 26 Nov '07

26 Nov '07

Hi, since ptr_vector are non copyable, how would i got baout making assignment from one ptr_vector to another.. i.e. ptr_vector<Foo> t; ptr_vector<Foo> t2; // some coding. t = t2;

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[Serialization] Strange crash with binary_iarchive
by Mahesh Venkitachalam 26 Nov '07

26 Nov '07

Hello, I am getting a crash in my application when reading from a binary archive created using boost serialization. From a small test application, with identical code, I can read this archive fine. But when I put the same code into into my main application, I get the crash shown in the stack below. Since I am not getting a crash for a simple test application, I am unable to provide a simple code example to the crash. I would appreciate any hints on why this can happen. As far as I understand, the compiler options are the same. Could this be due to a difference in MS RT libs linked to? Any debugging ideas welcome. I am using Visual Studio 8, and the application uses wxWidgets and OpenGL. Thanks Mahesh > msvcr80d.dll!memcpy(unsigned char * dst=0xcdcdcdcd, unsigned char * src=0x0012fb78, unsigned long count=1) Line 350 Asm msvcr80d.dll!memcpy_s(void * dst=0xcdcdcdcd, unsigned int sizeInBytes=3452816845, const void * src=0x0012fb78, unsigned int count=1) Line 67 + 0x11 bytes C msvcp80d.dll!std::char_traits<char>::_Copy_s(char * _First1=0xcdcdcdcd, unsigned int _Size_in_bytes=3452816845, const char * _First2=0x0012fb78, unsigned int _Count=1) Line 575 + 0x16 bytes C++ msvcp80d.dll!std::_Traits_helper::copy_s<std::char_traits<char> >(char * _First1=0xcdcdcdcd, unsigned int _Size=3452816845, const char * _First2=0x0012fb78, unsigned int _Count=1, std::_Secure_char_traits_tag __formal={...}) Line 707 + 0x15 bytes C++ msvcp80d.dll!std::_Traits_helper::copy_s<std::char_traits<char> >(char * _First1=0xcdcdcdcd, unsigned int _Size=3452816845, const char * _First2=0x0012fb78, unsigned int _Count=1) Line 699 + 0x21 bytes C++ msvcp80d.dll!std::basic_string<char,std::char_traits<char>,std::_DebugHeapAllocator<char> >::assign(const std::basic_string<char,std::char_traits<char>,std::_DebugHeapAllocator<char> > & _Right="*", unsigned int _Roff=0, unsigned int _Count=4294967295) Line 1021 + 0x25 bytes C++ msvcp80d.dll!std::basic_string<char,std::char_traits<char>,std::_DebugHeapAllocator<char> >::assign(const std::basic_string<char,std::char_traits<char>,std::_DebugHeapAllocator<char> > & _Right="*") Line 1006 C++ msvcp80d.dll!std::basic_string<char,std::char_traits<char>,std::_DebugHeapAllocator<char> >::operator=(const std::basic_string<char,std::char_traits<char>,std::_DebugHeapAllocator<char> > & _Right="*") Line 888 C++ msvcp80d.dll!std::_DebugHeapString::operator=(const std::_DebugHeapString & __that={...}) + 0x13 bytes C++ evviewn.exe!std::locale::locale<boost::archive::codecvt_null<char> >(const std::locale & _Loc={...}, const boost::archive::codecvt_null<char> * _Facptr=0x028c7178) Line 301 + 0x33 bytes C++ evviewn.exe!boost::archive::add_facet<boost::archive::codecvt_null<char> >(const std::locale & l={...}, boost::archive::codecvt_null<char> * f=0x028c7178) Line 46 + 0x2a bytes C++ evviewn.exe!boost::archive::basic_binary_iprimitive<boost::archive::binary_iarchive,char,std::char_traits<char> >::basic_binary_iprimitive<boost::archive::binary_iarchive,char,std::char_traits<char> >(std::basic_streambuf<char,std::char_traits<char> > & sb={...}, bool no_codecvt=false) Line 146 + 0x48 bytes C++ evviewn.exe!boost::archive::binary_iarchive_impl<boost::archive::binary_iarchive,char,std::char_traits<char> >::binary_iarchive_impl<boost::archive::binary_iarchive,char,std::char_traits<char> >(std::basic_istream<char,std::char_traits<char> > & is={...}, unsigned int flags=0) Line 79 + 0x4d bytes C++ evviewn.exe!boost::archive::binary_iarchive::binary_iarchive(std::basic_istream<char,std::char_traits<char> > & is={...}, unsigned int flags=0) Line 40 + 0x17 bytes C++ evviewn.exe!File4dv::read(const std::basic_string<char,std::char_traits<char>,std::allocator<char> > & filename="test.4dv") Line 53 + 0x11 bytes C++

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Is anyone going to tell me the way to set the WINDOWS variables for BOOST?
by question boost 26 Nov '07

26 Nov '07

Hi, in order to build boost I do: cd BOOST_ROOT/tools/jam/src then , bjam --toolset mingw stage and I get the following error: argument error rule boost-build (dir?) called with: (C:/Documents and settings/src/boost/tools/build/v2) extra argument and jambase.c:35:see the definition of rule 'boost-build' being called Is anyone going to tell me what goes wrong? THANK YOU VERY MUCH, David _________________________________________________________________ Votez pour vos séries TV préférées et tentez de gagner un voyage à Hawaï ! http://messengerawards.divertissements.fr.msn.com/

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