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sending and receiving struct using eNet and boost.serialization

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hello,

i want to send/receive packet using eNet and boost.serialization

i'm using enetpp wrapper for eNet and i'm using boost.serialization to serialize the struct

first, this is the first time that i'm working with boost.serialization

but my serialization code is as follows:

//the structure that represents the game data to be sent
typedef struct gamedata
{
const char *username;
const char *password;
int rank;
bool userpass_incorrect;
bool account_not_exist;
const char *mac_address;
const char *hdd_serial;
const char *ip_address;
int x;
int y;
int z;
int health;
bool is_banned;
bool notify;
const char *pm_user;
const char *chat_user;
const char *message;
const char *server_message;
const char *motd;
bool came_online;
bool went_offline;
private:
friend class boost::serialization::access;
template <class Archive>
void serialize(Archive& ar, const unsigned int version)
{
ar&username;
ar&password;
ar&userpass_incorrect;
ar&account_not_exist;
ar&mac_address;
ar&hdd_serial;
ar&ip_address;
ar&x;
ar&y;
ar&z;
ar&health;
ar&is_banned;
ar&notify;
ar&pm_user;
ar&chat_user;
ar&message;
ar&server_message;
ar&motd;
ar&came_online;
ar&went_offline;
}
}gamedata;

here is another serialize function that i've wrote in order to make it work but it didn't work:

//serialization/deserialization ruteens
template <class Archive>
void serialize(Archive& ar, gamedata *g, const unsigned int version)
{
ar&g->username;
ar&g->password;
ar&g->rank;
ar&g->userpass_incorrect;
ar&g->account_not_exist;
ar&g->mac_address;
ar&g->hdd_serial;
ar&g->ip_address;
ar&g->x;
ar&g->y;
ar&g->z;
ar&g->health;
ar&g->is_banned;
ar&g->notify;
ar&g->pm_user;
ar&g->chat_user;
ar&g->message;
ar&g->server_message;
ar&g->motd;
ar&g->came_online;
ar&g->went_offline;
}

and, this is the overload of operator <<:

//<<operator for our gamedata struct
ostream& operator << (ostream& os, gamedata *g)
{
os<<g->username;
os<<g->password;
os<<g->rank;
os<<g->userpass_incorrect;
os<<g->account_not_exist;
os<<g->mac_address;
os<<g->hdd_serial;
os<<g->ip_address;
os<<g->x;
os<<g->y;
os<<g->z;
os<<g->health;
os<<g->is_banned;
os<<g->notify;
os<<g->pm_user;
os<<g->chat_user;
os<<g->message;
os<<g->server_message;
os<<g->motd;
os<<g->came_online;
os<<g->went_offline;
}

and, i want to load it into stringstream:

(data is the packet data, cl.gd is a pointer to my gamedata struct)

stringstream ss((char *)data);
text_iarchive ia(ss);
ia>>cl.gd;

and this is the code to save it into ostringstream for sending:

ostringstream s;
text_oarchive oa(s);
oa<<cl.gd;

and, these are 2 errors that i've got:

In file included from C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/extended_type_info_typeid.hpp:37:0,
from C:/Dev-Cpp/i686-w64-mingw32/include/boost/archive/detail/oserializer.hpp:38,
from C:/Dev-Cpp/i686-w64-mingw32/include/boost/archive/detail/interface_oarchive.hpp:23,
from C:/Dev-Cpp/i686-w64-mingw32/include/boost/archive/detail/common_oarchive.hpp:22,
from C:/Dev-Cpp/i686-w64-mingw32/include/boost/archive/basic_text_oarchive.hpp:29,
from C:/Dev-Cpp/i686-w64-mingw32/include/boost/archive/text_oarchive.hpp:31,
from F:\projects\cpp\missiontime-server\src\main.cpp:7:
C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/access.hpp: In instantiation of 'static void boost::serialization::access::serialize(Archive&,
T&, unsigned int) [with Archive = boost::archive::text_iarchive; T = char]':
C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/serialization.hpp:68:22: required from 'void boost::serialization::serialize(Archive&, T&, unsigned
int) [with Archive = boost::archive::text_iarchive; T = char]'
C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/serialization.hpp:126:14: required from 'void boost::serialization::serialize_adl(Archive&, T&,
unsigned int) [with Archive = boost::archive::text_iarchive; T = char]'
C:/Dev-Cpp/i686-w64-mingw32/include/boost/archive/detail/iserializer.hpp:189:40: required from 'void boost::archive::detail::iserializer<Archive, T>::load_object_data(boost::archive::detail::basic_iarchive&,
void*, unsigned int) const [with Archive = boost::archive::text_iarchive; T = char]'
F:\projects\cpp\missiontime-server\src\main.cpp:335:1: required from here
C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/access.hpp:116:9: error: request for member 'serialize' in 't', which is of non-class type 'char'
t.serialize(ar, file_version);
^
C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/access.hpp: In instantiation of 'static void boost::serialization::access::serialize(Archive&,
T&, unsigned int) [with Archive = boost::archive::text_oarchive; T = char]':
C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/serialization.hpp:68:22: required from 'void boost::serialization::serialize(Archive&, T&, unsigned
int) [with Archive = boost::archive::text_oarchive; T = char]'
C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/serialization.hpp:126:14: required from 'void boost::serialization::serialize_adl(Archive&, T&,
unsigned int) [with Archive = boost::archive::text_oarchive; T = char]'
C:/Dev-Cpp/i686-w64-mingw32/include/boost/archive/detail/oserializer.hpp:148:40: required from 'void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&,
const void*) const [with Archive = boost::archive::text_oarchive; T = char]'
F:\projects\cpp\missiontime-server\src\main.cpp:335:1: required from here
C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/access.hpp:116:9: error: request for member 'serialize' in 't', which is of non-class type 'char'

now:

compiler: gcc (mingw-w64) 5.3.0 with gnu++14 enabled

boost: 1.60.0

thanks in advance

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hi again,
it has been fixed!, but why boost.serialization doesn't serialize pointers?

Why would you serialise pointers? The scope of pointer is protected memory.

The way serialisation works is if the serialiser (Archive) knows about the type (meta-data) that is passed to it. Bool, unsigned integer,... Generic types are unambiguous, or objects with methods understood by the serialiser (a component derived to be 'serialisable' for example).

Passing a pointer, it could be a pointer to a single element (a single 'char' for example), a string (in terms of chars, which are null terminated), or an array of an arbitrary number of elements. Then how many elements should be serialised? Where do those arrays get deserislalised into? Who is doing the memory allocation on the receiver end? What if the 'username' string on the deserialiser side is already allocated memory? Will you get a memory leak? What if it points to static data? Static allocation have a fixed size, what is the string/array is bigger than the static allocation?

Questions, questions... When you deal with pointers and address of things, you have to be extra careful.

Containers take care of those problems, and you should be using them when possible, like vectors, lists, strings, maps (dictionaries).

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why boost.serialization doesn't serialize pointers?


Because the value of the pointer makes no sense outside your process, and boost::serialization can't know how many elements to serialize if it were to serialize the pointed-at data.

To do that, you have to tell it what to do. Look at:
 
boost::serialization::binary_object(void * t, size_t size);
and

template <T> boost::serialization::make_array(T* t, std::size_t size);
Edited by hplus0603

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ok, got it

but when i've changed char *username to std::string username and tried to connect, it crashed (i don't know what i'm doing wrong)

std::string is safe to use and i don't know what is wrong with it!

this is the debug log:

Active debugger config: GDB/CDB debugger:Default
Building to ensure sources are up-to-date
Selecting target:
Debug
Adding source dir: F:\projects\cpp\missiontime\
Adding source dir: F:\projects\cpp\missiontime\
Adding file: F:\projects\cpp\missiontime\bin\Debug\missiontime.exe
Changing directory to: F:/projects/cpp/missiontime/bin/Debug
Set variable: PATH=.;C:\Dev-Cpp\bin;C:\Dev-Cpp;C:\Windows\System32;C:\Windows;C:\Windows\System32\wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Program Files\TortoiseSVN\bin;C:\Program Files\Skype\Phone;C:\Program Files\CMake\bin;C:\Program Files\Heroku\bin;C:\Program Files\Git\cmd;C:\php;C:\ProgramData\ComposerSetup\bin;C:\Users\brightening-eyes\AppData\Roaming\Composer\vendor\bin

[debug]Command-line: C:\Dev-Cpp\bin\gdb.exe -fullname -quiet  -args F:/projects/cpp/missiontime/bin/Debug/missiontime.exe
[debug]Working dir : F:\projects\cpp\missiontime\bin\Debug

Starting debugger: C:\Dev-Cpp\bin\gdb.exe -fullname -quiet  -args F:/projects/cpp/missiontime/bin/Debug/missiontime.exe
done

[debug]> set prompt >>>>>>cb_gdb:

Registered new type: wxString
Registered new type: STL String
Registered new type: STL Vector
Setting breakpoints

[debug]Reading symbols from F:/projects/cpp/missiontime/bin/Debug/missiontime.exe...
[debug]done.
[debug](gdb)
[debug]>>>>>>cb_gdb:
[debug]> show version
[debug]GNU gdb (GDB) 7.10.1
[debug]Copyright (C) 2015 Free Software Foundation, Inc.
[debug]License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
[debug]This is free software: you are free to change and redistribute it.
[debug]There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
[debug]and "show warranty" for details.
[debug]This GDB was configured as "i686-w64-mingw32".
[debug]Type "show configuration" for configuration details.
[debug]For bug reporting instructions, please see:
[debug]<http://www.gnu.org/software/gdb/bugs/>.
[debug]Find the GDB manual and other documentation resources online at:
[debug]<http://www.gnu.org/software/gdb/documentation/>.
[debug]For help, type "help".
[debug]Type "apropos word" to search for commands related to "word".
[debug]>>>>>>cb_gdb:
[debug]> set confirm off

Debugger name and version: GNU gdb (GDB) 7.10.1

[debug]>>>>>>cb_gdb:
[debug]> set width 0
[debug]>>>>>>cb_gdb:
[debug]> set height 0
[debug]>>>>>>cb_gdb:
[debug]> set breakpoint pending on
[debug]>>>>>>cb_gdb:
[debug]> set print asm-demangle on
[debug]>>>>>>cb_gdb:
[debug]> set unwindonsignal on
[debug]>>>>>>cb_gdb:
[debug]> set print elements 0
[debug]>>>>>>cb_gdb:
[debug]> set new-console on
[debug]>>>>>>cb_gdb:
[debug]> set disassembly-flavor intel
[debug]>>>>>>cb_gdb:
[debug]> catch throw
[debug]Catchpoint 1 (throw)
[debug]>>>>>>cb_gdb:
[debug]> source C:\Program Files\CodeBlocks\share\codeblocks/scripts/stl-views-1.0.3.gdb
[debug]>>>>>>cb_gdb:
[debug]> directory F:/projects/cpp/missiontime/
[debug]Source directories searched: F:/projects/cpp/missiontime;$cdir;$cwd
[debug]>>>>>>cb_gdb:
[debug]> run
[debug]Starting program: F:\projects\cpp\missiontime\bin\Debug\missiontime.exe

Child process PID: 8692

[debug][New Thread 8692.0x1f08]
[debug][New Thread 8692.0x13e8]
[debug][New Thread 8692.0x1de8]
[debug][New Thread 8692.0x21e4]
[debug][New Thread 8692.0x2390]
[debug][New Thread 8692.0x1c84]
[debug][New Thread 8692.0x1c7c]
[debug][New Thread 8692.0x20fc]
[debug][New Thread 8692.0x2550]
[debug][New Thread 8692.0x1ee4]
[debug][New Thread 8692.0x19f0]
[debug][New Thread 8692.0x12cc]
[debug][New Thread 8692.0x2694]
[debug][Thread 8692.0x2694 exited with code 0]
[debug][Thread 8692.0x12cc exited with code 0]
[debug][New Thread 8692.0x20ec]
[debug][New Thread 8692.0x22b4]
[debug][Thread 8692.0x22b4 exited with code 0]
[debug][Thread 8692.0x20ec exited with code 0]
[debug]Program received signal SIGSEGV, Segmentation fault.
[debug]0x76f2ab86 in wcsnicmp () from C:\Windows\system32\msvcrt.dll
[debug]>>>>>>cb_gdb:

Program received signal SIGSEGV, Segmentation fault.
In wcsnicmp () (C:\Windows\system32\msvcrt.dll)

[debug]> bt 30
[debug]#0  0x76f2ab86 in wcsnicmp () from C:\Windows\system32\msvcrt.dll
[debug]#1  0x005da89f in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_assign(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ()
[debug]#2  0x00000000 in ?? ()
[debug]>>>>>>cb_gdb:

i guess this is from std::string::assign, but i'm not sure

what can be wrong?

and, std::string hold's a pointer from the text!, but it can be serialized!

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Compile your code with -O0 and -ggdb, and then set a breakpoint before the crashing line, and step through it.

std::string is safe, even though it uses pointers internally, because boost::serialization has a specialization for std::string (and most of the other STL containers.)

Did you look at the binary object and array support functions I recommended? Do you understand how they work and why they're needed? If not, you probably need to read up a bit on how C++ and pointers work in general before you'll be successful doing networking and other systems programming.

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i know how pointers are work, but can i serialize pointers with for loop like this?

for (int i=0;i<strlen(text);++i)
{
ar&text[i];
}
i thaught boost.serialization does this automaticly (as i've read from documentation and theboostcpplibraries.com website)
and, this is my first time that i'm using boost.serialization

thanks

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hi again,
thanks for helps
again, i've fixed the error and another exception that i don't know where this occurs:

Active debugger config: GDB/CDB debugger:Default
Building to ensure sources are up-to-date
Selecting target:
Debug
Adding source dir: F:\projects\cpp\missiontime\
Adding source dir: F:\projects\cpp\missiontime\
Adding file: F:\projects\cpp\missiontime\bin\Debug\missiontime.exe
Changing directory to: F:/projects/cpp/missiontime/bin/Debug
Set variable: PATH=.;C:\Dev-Cpp\bin;C:\Dev-Cpp;C:\Windows\System32;C:\Windows;C:\Windows\System32\wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Program Files\TortoiseSVN\bin;C:\Program Files\Skype\Phone;C:\Program Files\CMake\bin;C:\Program Files\Heroku\bin;C:\Program Files\Git\cmd;C:\php;C:\ProgramData\ComposerSetup\bin;C:\Users\brightening-eyes\AppData\Roaming\Composer\vendor\bin

[debug]Command-line: C:\Dev-Cpp\bin\gdb.exe -fullname -quiet  -args F:/projects/cpp/missiontime/bin/Debug/missiontime.exe
[debug]Working dir : F:\projects\cpp\missiontime\bin\Debug

Starting debugger: C:\Dev-Cpp\bin\gdb.exe -fullname -quiet  -args F:/projects/cpp/missiontime/bin/Debug/missiontime.exe
done

[debug]> set prompt >>>>>>cb_gdb:

Registered new type: wxString
Registered new type: STL String
Registered new type: STL Vector
Setting breakpoints

[debug]Reading symbols from F:/projects/cpp/missiontime/bin/Debug/missiontime.exe...
[debug]done.
[debug](gdb)
[debug]>>>>>>cb_gdb:
[debug]> show version
[debug]GNU gdb (GDB) 7.10.1
[debug]Copyright (C) 2015 Free Software Foundation, Inc.
[debug]License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
[debug]This is free software: you are free to change and redistribute it.
[debug]There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
[debug]and "show warranty" for details.
[debug]This GDB was configured as "i686-w64-mingw32".
[debug]Type "show configuration" for configuration details.
[debug]For bug reporting instructions, please see:
[debug]<http://www.gnu.org/software/gdb/bugs/>.
[debug]Find the GDB manual and other documentation resources online at:
[debug]<http://www.gnu.org/software/gdb/documentation/>.
[debug]For help, type "help".
[debug]Type "apropos word" to search for commands related to "word".
[debug]>>>>>>cb_gdb:
[debug]> set confirm off

Debugger name and version: GNU gdb (GDB) 7.10.1

[debug]>>>>>>cb_gdb:
[debug]> set width 0
[debug]>>>>>>cb_gdb:
[debug]> set height 0
[debug]>>>>>>cb_gdb:
[debug]> set breakpoint pending on
[debug]>>>>>>cb_gdb:
[debug]> set print asm-demangle on
[debug]>>>>>>cb_gdb:
[debug]> set unwindonsignal on
[debug]>>>>>>cb_gdb:
[debug]> set print elements 0
[debug]>>>>>>cb_gdb:
[debug]> set new-console on
[debug]>>>>>>cb_gdb:
[debug]> set disassembly-flavor intel
[debug]>>>>>>cb_gdb:
[debug]> catch throw
[debug]Catchpoint 1 (throw)
[debug]>>>>>>cb_gdb:
[debug]> source C:\Program Files\CodeBlocks\share\codeblocks/scripts/stl-views-1.0.3.gdb
[debug]>>>>>>cb_gdb:
[debug]> directory F:/projects/cpp/missiontime/
[debug]Source directories searched: F:/projects/cpp/missiontime;$cdir;$cwd
[debug]>>>>>>cb_gdb:
[debug]> run
[debug]Starting program: F:\projects\cpp\missiontime\bin\Debug\missiontime.exe

Child process PID: 25368

[debug][New Thread 25368.0x61dc]
[debug][New Thread 25368.0x642c]
[debug][New Thread 25368.0x65f4]
[debug][New Thread 25368.0x64e4]
[debug][New Thread 25368.0x66a8]
[debug][New Thread 25368.0x6354]
[debug][New Thread 25368.0x67ec]
[debug][New Thread 25368.0x63dc]
[debug][New Thread 25368.0x6680]
[debug][New Thread 25368.0x6428]
[debug][New Thread 25368.0x60c8]
[debug][New Thread 25368.0x6008]
[debug][New Thread 25368.0x6660]
[debug][Thread 25368.0x6660 exited with code 0]
[debug][Thread 25368.0x6008 exited with code 0]
[debug][New Thread 25368.0x6388]
[debug][New Thread 25368.0x628c]
[debug][Thread 25368.0x6388 exited with code 0]
[debug][Thread 25368.0x628c exited with code 0]
[debug][New Thread 25368.0x67dc]
[debug]Catchpoint 1 (exception thrown), 0x006069a0 in __cxa_throw ()
[debug]>>>>>>cb_gdb:

In __cxa_throw () ()

[debug]> bt 30
[debug]#0  0x006069a0 in __cxa_throw ()
[debug]#1  0x0053ef0d in boost::serialization::throw_exception<boost::archive::archive_exception> (e=...) at C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/throw_exception.hpp:36
[debug]#2  0x00543ae5 in boost::archive::basic_text_iarchive<boost::archive::text_iarchive>::init() () at C:/Dev-Cpp/i686-w64-mingw32/include/boost/archive/text_oarchive.hpp:97
[debug]#3  0x0054171e in boost::archive::text_iarchive_impl<boost::archive::text_iarchive>::text_iarchive_impl(std::istream&, unsigned int) () at C:/Dev-Cpp/i686-w64-mingw32/include/boost/archive/text_oarchive.hpp:114
[debug]#4  0x00540b34 in boost::archive::text_iarchive::text_iarchive (this=0x22f56c, is_=..., flags=0) at C:/Dev-Cpp/i686-w64-mingw32/include/boost/archive/text_iarchive.hpp:124
[debug]#5  0x00431445 in <lambda()>::operator()(void) const (__closure=0x22fb90) at F:\projects\cpp\missiontime\src\main.cpp:237
[debug]#6  0x00433fd9 in std::_Function_handler<void(), connect_game()::<lambda()> >::_M_invoke(const std::_Any_data &) (__functor=...) at C:/Dev-Cpp/i686-w64-mingw32/include/c++/functional:1871
[debug]#7  0x0058a95e in std::function<void ()>::operator()() const (this=0x22fb90) at C:/Dev-Cpp/i686-w64-mingw32/include/c++/functional:2271
[debug]#8  0x0054cde5 in enetpp::client::consume_events(std::function<void ()>, std::function<void ()>, std::function<void (unsigned char const*, unsigned int)>) (this=0x22fa7c, on_connected=..., on_disconnected=..., on_data_received=...) at F:/projects/cpp/missiontime/include/enetpp/client.h:115
[debug]#9  0x004321d5 in connect_game () at F:\projects\cpp\missiontime\src\main.cpp:296
[debug]#10 0x0043327f in main_menu () at F:\projects\cpp\missiontime\src\main.cpp:424
[debug]#11 0x00433b1d in SDL_main (argc=argc@entry=1, argv=argv@entry=0x270008) at F:\projects\cpp\missiontime\src\main.cpp:521
[debug]#12 0x0043a26f in main_utf8 (argv=0x270008, argc=<optimized out>) at ../src/main/windows/SDL_windows_main.c:126
[debug]#13 WinMain@16 (hInst=0x400000, hPrev=0x0, szCmdLine=0x292688 "", sw=10) at ../src/main/windows/SDL_windows_main.c:189
[debug]#14 0x006075dd in main ()
[debug]>>>>>>cb_gdb:
[debug]> frame 1
[debug]#1  0x0053ef0d in boost::serialization::throw_exception<boost::archive::archive_exception> (e=...) at C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/throw_exception.hpp:36
[debug]C:\Dev-Cpp\i686-w64-mingw32\include\boost\serialization\throw_exception.hpp:36:810:beg:0x53ef0d
[debug]>>>>>>cb_gdb:

#1  0x0053ef0d in boost::serialization::throw_exception<boost::archive::archive_exception> (e=...) at C:/Dev-Cpp/i686-w64-mingw32/include/boost/serialization/throw_exception.hpp:36
C:\Dev-Cpp\i686-w64-mingw32\include\boost\serialization\throw_exception.hpp:36:810:beg:0x53ef0d
At C:\Dev-Cpp\i686-w64-mingw32\include\boost\serialization\throw_exception.hpp:36
where should i catch this? or what i'm doing wrong?

the line 232 to 239 is as follows:
auto onconnected=[&](){
is_connected=true;
Tolk_Speak(L"success", reader_interrupt);
stringstream sd;
sd<<g;
text_iarchive ia(sd);
c.send_packet(0, sd.str().c_str(), sd.str().size(), ENET_PACKET_FLAG_RELIABLE);
};
what is wrong with boost.serialization that doesn't serialize that?
thanks

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I think you really need to step up your debugging here and dive in.
First: What is the text/message of the exception?
Second: Set a breakpoint at the beginning of your closure. Figure out what it's doing when it's serializing, and why it decides to throw.
Third: I have no idea what "g" is because you're not showing that. Is it a reference to some local variable in the outer scope? If so, has that outer function already returned?

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hello,

this problem has been fixed

thanks for your helps

the problem was that, i wanted to serialize an empty stream to my g (a gamedata* local variable(better to say pointer))

and that exception occured

thanks in advance for your helps

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